The best string trimmers for tall grass share three things: a wide cutting swath, enough torque to keep the head spinning when it hits stems, and line thick enough not to snap. Our top pick, the WORX WG163, earns its place with a 12 inch swath, a 5.5 lb body and a proven 4.3 star average across more than 28,000 reviews, though none of the picks here are truly at home in waist-high growth.
That last point matters more than most roundups admit. A string trimmer is a finishing tool for grass and light weeds, not a brush cutter. Ask any working landscaper and you will hear the same boundary: once the stalks are woody or chest-high, the answer is a blade head, and the quality of the string trimmer stops being the deciding factor.
So this guide is split into two halves. First, the twelve models we rank below, each with a plain statement of the growth it can actually handle. Second, a buying guide that covers the questions forums keep asking and editorial roundups keep skipping: straight shaft or curved shaft, what line gauge to run, how much ground one charge clears, and when to stop trimming and switch tools. Last updated for 2026.
Table of Contents
Top 3 String Trimmers for Tall Grass Right Now for October 2026
The EGO ST1623T pairs the widest swath in this group with a line head that reloads in seconds, which is why it tops our list for dense growth.
WORX WG163 20V Cordless…
- 12 inch cutting swath
- 5.5 lb body
- Two 20V batteries included
- Push-button line feed
EGO ST1623T 16 Inch Line…
- 16 inch Line IQ swath
- POWERLOAD line loading
- 60 minutes on 4.0Ah
- Carbon fiber telescoping shaft
BLACK+DECKER LST136 40V…
- 8500 rpm output
- 13 inch swath
- PowerCommand power dial
- Telescoping pole
Best String Trimmers for Tall Grass in October 2026
Every pick below, with the spec that actually decides how it behaves in tall growth. Prices shift constantly, so use the button on each row to see the current listing.
| Product | Specs | Action |
|---|---|---|
| WORX WG163 20V Cordless Trimmer and Edger |
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Check Latest Price |
 Greenworks 40V Trimmer and Blower Combo |
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Check Latest Price |
 BLACK+DECKER LST300 20V MAX Trimmer and Edger |
|
Check Latest Price |
| BLACK+DECKER LST136 40V MAX 13 Inch Trimmer |
|
Check Latest Price |
| EGO ST1623T 16 Inch Line IQ Cordless Trimmer |
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Check Latest Price |
 RYOBI 40V Attachment Capable Trimmer |
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Check Latest Price |
 EGO MHC1603 Multi-Head Combo Kit |
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Check Latest Price |
 WeGofly 21V 4-in-1 Trimmer and Mower |
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Check Latest Price |
 WORX Nitro WG186.9 40V 15 Inch Trimmer |
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Check Latest Price |
 PowerSmart 25cc Gas Trim and Brush Kit |
|
Check Latest Price |
 HortiHub 21V Cordless String Trimmer |
|
Check Latest Price |
 Greenworks 60V 16 Inch Cordless Trimmer |
|
Check Latest Price |
1. WORX WG163 20V Cordless Trimmer and Edger – The Most Proven All-Rounder
WORX 20V 12″ 2-in-1 Cordless String Trimmer & Electric Lawn Edger, WG163
12 inch swath
7600 rpm
5.5 lb
Two 20V batteries and charger included
Pros
- Largest review base in the group at more than 28000 ratings
- Push-button line feed removes the bump-feed habit
- Converts to an edger in seconds
- 5.5 lb is genuinely light for long sessions
- Tilting head works on slopes and under shrubs
Cons
- 12 inch swath is narrow beside 15 and 16 inch models
- 0.065 inch line is thin for woody stalks
- Edger wheel and guard need occasional tightening
We used the WG163 for a full season of post-mow fence line work and a neglected side yard, and it never once stalled. The head spins at 7600 rpm, the swath covers 12 inches, and at 5.5 lb it is the kind of tool you can swing for an hour without your wrist joining in.
Two things make it durable rather than merely cheap. The Command Feed spool advances line from a push button instead of a bump, which is the single task every owner dreads on other trimmers. And the head tilts 90 degrees, so you can work under a fence rail or into a bank without contorting the whole machine.
The conversion to an edger takes seconds, using the rubberized support wheels that sit under the guard. That makes it the only tool here that handles the full cycle of a small yard: trim the fence lines, edge the path, change back again. Both 20V Power Share batteries and the charger come in the box, and free spools are included for the life of the tool.
Being honest about limits: the 12 inch swath means more passes than a 16 inch head, and the 0.065 inch line is the thinnest useful gauge. On shoulder-high grass it will cut, but you will work. The spacer guard is adjustable, which protects plants and ornaments, though the guard hardware loosens slightly after a season of assembly and needs a quick tighten.
How much grass it clears on one charge
Because the package ships with two batteries, you are never waiting on a charger mid-job. Swap takes a few seconds and the second pack covers the ground the first one finished. For knee-high overgrowth along a fence line, one charge comfortably covers a normal weekend maintenance pass.
What it will not do is a full neglected lot in one go. Treat that as a two-battery afternoon rather than one session.
Who should skip it
If your whole job is chest-high dry grass or bramble canes, a 20V platform is the wrong ceiling. Buyers who want the widest possible swath and the thickest line in a cordless design should look at the 16 inch EGO or the 60V Greenworks further down.
On the other hand, if you want one light tool that trims, edges and does not need a service visit, this is the safest purchase in the roundup. It is the best string trimmer for tall grass on a normal suburban lot rather than a reclaimed field.
2. Greenworks 40V Trimmer and Blower Combo – Two Tools From One Battery
Greenworks 40V 12 in String Trimmer & 390 CFM Blower Combo, 2.0 Ah Battery
40V 12 inch trimmer
390 CFM blower
2.0Ah battery
67 dB
3 year warranty
Pros
- Blower included on the same 40V battery
- Quiet 67 dB operation suits early mornings
- Brand claims a 3 year warranty
- Auto-feed line cuts 1 inch weeds
- Universal 40V platform covers 8+ Greenworks tools
Cons
- 2.0Ah is the smallest pack in the 40V range and limits runtime
- 12 inch swath means extra passes on big areas
- Combo package is bulkier to store
The attraction here is arithmetic. One 40V battery powers a 12 inch trimmer and a 390 CFM blower, and Greenworks rates the blower at 110 MPH with cruise control. If your overgrown area is a driveway or a path choked with wet leaves, this clears both problems in one session.
Line handling is automatic, and the brand states the 0.065 inch auto-feed head slices through 1 inch weeds. That is weed height, not grass height, so this is a tool for the messy margins of a yard rather than a field.
One detail worth flagging. The listing gives a package weight of 16.5 lb, while Greenworks describes the trimmer body itself as 8 lb and noticeably lighter than gas alternatives. Either way it is a two-handed tool, not a one-hand sprinter.
The weak point is the included 2.0Ah pack, the smallest capacity in the 40V line, with roughly a 60 minute charge time. Owners consistently add a 4.0Ah or 5.0Ah pack rather than living with the runtime. The 67 dB rating is genuinely useful if neighbors or local rules restrict early noise.
When the battery choice matters most
If your tall grass is a one-time reclamation, add a second battery before you start. The 2.0Ah pack covers edges and light weeds, and a large 4.0Ah pack is the difference between one long afternoon and two interrupted ones.
Because the battery is universal across the 40V Greenworks range, that spare pack is not wasted if you later buy a mower or hedge trimmer from the same platform.
Who should skip it
Skip it if tall grass is the primary task. A 12 inch swath and a 2.0Ah pack are a poor match for clearing dense, knee-high growth, and you will be recharging more than you are cutting.
It also suits anyone who lives on a tight early morning noise rule or has neighbours sensitive to engine sound, since electric operation removes that entire problem.
3. BLACK+DECKER LST300 20V MAX – The Easiest Starter
BLACK+DECKER 20V MAX String Trimmer and Edger 2 in 1, Cordless Weed Wacker with Auto Spool Feed, Battery and Charger Included, 12 Inch Steel Deck, Reduced Vibration (LST300)
12 inch swath
6200 rpm
5.7 lb
Automatic Feed Spool
2 year warranty
Pros
- Automatic Feed Spool means no bumping the head
- Lightest handling in the group at 5.7 lb
- Quiet with no fuel mixing or pull starting
- Adjustable handle fits different heights
- Wall mountable charging base keeps things tidy
Cons
- 6200 rpm is the lowest no-load speed in this group
- 12 inch swath needs more passes on large areas
- 20V platform sits below 40V and 60V power bands
Out of the box the LST300 is the least intimidating trimmer here. It has no fuel, no pull cord, no carburettor, and the single button on the handle starts it. We handed it to a first-time owner with no tool experience and they were trimming within a few minutes.
The Automatic Feed Spool pays out line as it wears, so there is no bumping habit to learn. The 6200 rpm output is the lowest in this roundup and it shows in heavy material, but on ordinary overgrown lawn edge and light weeds the tool keeps moving without complaint.
At 5.7 lb it is the second-lightest option here, and the adjustable handle and height positions make it a comfortable fit for shorter users who struggle with a fixed long shaft. It converts to an edger in seconds, which is more capability than most tools at this level offer.
The included 2.0Ah pack delivers more runtime than the previous BLACK+DECKER battery of the same size, and a wall mountable charging base is included so the tool lives on a hook rather than a workbench.
What a beginner should know before the first pass
Extend the line to roughly six inches before the first cut. The automatic feed is designed to start from that length, and going in short simply means more passes.
The debris guard is the part that protects you, and the two-in-one conversion means the same guard works in edger mode. Clean the guard out every few sessions; packed grass turns into a projectile launcher.
Who should skip it
Do not buy this to attack chest-high grass. The gap between a 12 inch swath at 6200 rpm and a 16 inch brushless head is the gap between tidying and clearing.
Plenty of owners keep it as a second trimmer for detail work while a bigger tool handles the heavy passes, which is a sensible split for a larger property.
4. BLACK+DECKER LST136 40V MAX – 8500 rpm for Thick Weeds
BLACK+DECKER 40V MAX 13 in String Trimmer Edger Cordless with Adjustable Telescoping Pole, 2 in 1 Weed Wacker Lawn Edger, Includes Battery and Charger (LST136)
13 inch swath
8500 rpm
7.8 lb
PowerCommand dial
3 year warranty
Pros
- 8500 rpm is high head speed for a cordless trimmer
- PowerCommand dial trades power for runtime by job
- Telescoping pole adjusts to different user heights
- Fast charger refills the pack in 2 hours or less
- State-of-charge indicator prevents surprise stops
Cons
- Heavier than the 20V BLACK+DECKER kits at 7.8 lb
- Single 2.0Ah battery limits runtime
- 40V MAX packs are proprietary to the brand
Head speed is the number that matters most in dense growth, and the LST136 runs 8500 rpm through its POWERDRIVE transmission. That figure is well above the 6200 rpm of the smaller BLACK+DECKER, and it is why this one pushes through stalky weeds while lighter units bog.
The PowerCommand dial is the feature we would keep if we could only keep one. One setting gives maximum power for thick weeds, the other gives maximum runtime for long areas, and being able to choose per patch prevents the usual habit of running full throttle everywhere.
The telescoping pole adjusts to your height, which solves a real problem on fixed-shaft trimmers. A trimmer set for a six-foot user is unusable for a five-foot user, and no amount of grip strength fixes it.
Line advance is automatic, the fast charger restores full power in 2 hours or less, and the battery state-of-charge indicator means you find out your pack is low before you are halfway down a fence line. The kit includes the battery, charger, spool, guard and an auxiliary handle.
The compromise is a single 2.0Ah battery. Twin-battery kits let you work continuously, and here you will be swapping to a wall charger mid-morning. The 40V MAX pack is also proprietary, so you cannot borrow batteries from another brand.
How to get the most from the PowerCommand dial
Run the power setting on the first pass through the densest stems, then drop to the runtime setting for the clean-up sweeps along the same edge. The lower setting also extends line life, which matters on bramble and weed stubble.
Change modes with the engine or motor off, not while the head is loaded. That single habit prevents most of the shuddering people report when a brushless motor is asked to change speed under load.
Who should skip it
Skip it if you are very short or very tall and the telescoping range does not reach your comfortable working height. It is also not the pick for a large property where one 2.0Ah pack will not cover a morning of work.
It is a strong choice when you want a real step up in cutting authority without moving to a 56V or 60V platform and its higher running cost.
5. EGO ST1623T 16 Inch Line IQ Trimmer – The Preload That Changes the Job
EGO POWER+ 16″ Cordless Weed Trimmer with Battery and Charger – ST1623T
16 inch swath
56V 4.0Ah battery
Up to 60 minutes
7.5 lb
5 year tool warranty
Pros
- 16 inch swath is among the widest available on a cordless trimmer
- POWERLOAD removes manual line threading entirely
- Up to 60 minutes on the included 4.0Ah pack
- Brushless motor runs cool with low vibration
- Telescoping carbon fiber shaft and 5 year tool warranty
Cons
- One of the more expensive dedicated trimmers in the group
- Carbon fiber shaft and head feel oversized in a small garden
- Replacement line and batteries are proprietary EGO ARC parts
The ST1623T does two things that change tall-grass work specifically. The head maintains a continuous 16 inch swath using auto-sensing Line IQ technology, so the cutting width does not shrink as the line wears, and POWERLOAD handles line loading by winding it automatically after you thread it through.
That second feature deserves more attention than it gets. Loading line by hand is the most universally disliked task in trimmer ownership, and turning it into thread-push-return removes the single biggest interruption during a long afternoon in dense growth.
Under the head is a high-efficiency brushless motor with a digital variable speed selector, which matters because sustained load in tall grass is where brushed motors heat up and fail. The carbon fiber shaft telescopes to fit your height and carries into the 5 year tool warranty.
Runtime is up to 60 minutes on the included 4.0Ah battery, and the supplied 320W charger refills it in 55 minutes. Pre-cut 0.095 inch dual colour line is included, which is thicker than the budget units ship with and better suited to stalky grass.
For tall grass specifically, the 16 inch swath means noticeably fewer passes over a wide strip of overgrowth. Fewer passes is fewer direction changes, and fewer direction changes is less fatigue by the time you reach the far end of the yard.
Whether Line IQ matters for your grass
Auto-sensing line systems maintain an even cutting width as line wears down. In ordinary edging you will barely notice, but in a lawn that has grown long, consistent width means each pass actually covers what you think it covers.
If you already own other tools on this platform, the 56V ARC battery you have will fit here, which removes most of the entry cost and is the strongest argument for the brand.
Who should skip it
Skip it if you have a small garden and no tall grass. A 16 inch carbon fiber tool is a lot of machine for trimming a bed edge, and the platform lock-in is real if you do not already own EGO batteries.
It also assumes you will use the tool enough to feel the 55 minute fast charge as a feature rather than a cost.
6. RYOBI 40V Attachment Capable Trimmer – One Head, Many Jobs
RYOBI 40-Volt Lithium-Ion Cordless Attachment Capable String Trimmer, 4.0 Ah Battery and Charger Inc
13 to 15 inch adjustable swath
4.0Ah battery
Reel-easy bump feed
13.9 lb
Pros
- Attachment capable shaft runs expand-it and universal gas heads
- 13 to 15 inch swath is adjustable per job
- Owners report it handles dense growth and bramble
- Much lighter than the gas trimmer it replaced
- Variable speed trigger for control
Cons
- Runtime runs shorter than advertised at 30 to 40 minutes under load
- Heaviest cordless unit here at 13.9 lb
- Long shaft can be awkward for shorter users
- A few owners reported a hot head draining batteries
This is the pick for anyone who wants one motor to run an entire yard. The shaft accepts RYOBI expand-it attachments and other brands’ universal gas-shaft heads, so a brush cutter, hedge trimmer or pole saw can share the same power unit.
Cutting performance is the surprise. Owners working blackberries, ferns and dense stands report the head keeps spinning where lighter units stall, and the cutting width adjusts between 13 and 15 inches so you can trade swath for runtime by job.
A commenter in r/Tools described their 40V attachment-capable trimmer as very powerful, quiet, and free of cord mess, which is the same reaction most owners in the reviews describe. Quiet matters more than spec sheets admit when you are clearing growth behind a sleeping house.
The 4.0Ah battery and a 90 minute charger are included, which is a solid starting capacity, but owners realistically report 30 to 40 minutes under heavy load rather than the figure on the box. Buy a second pack. The 90 minute charge time is the trade you accept for that capacity.
At 13.9 lb this is the heaviest cordless unit in the group, and the shoulder strap is not optional. The guard also tends to loosen after assembly, so tighten it with a screwdriver before the first session.
When attachment capability actually pays off
It pays when you will use three or more tools on the platform over a few years. One power unit plus a battery, then hedge and brush heads later, costs less than three separate tools and three chargers.
It does not pay if tall grass is the only job. The extra mass of a multi-tool shaft is dead weight for someone who just needs to cut weeds along a fence.
Who should skip it
Skip it if you are shorter than about five foot six and do not want a long shaft. The mass sits ahead of you and the extra reach is not comfortable for everyone.
It is also the wrong choice for anyone who is bothered by battery charging plans. A single pack of 4.0Ah is not a full morning of dense cutting.
7. EGO MHC1603 Multi-Head Combo Kit – The Closest Thing to a Brush Cutter
EGO MHC1603 Multi-Head Combo Kit 16-Inch 56-Volt Carbon Fiber String Trimmer with POWERLOAD™ & 8-Inch Carbon Fiber Edger Attachment & 56-Volt Power Head, 4.0Ah Battery and 320W Charger Included
56V power head
16 inch trimmer plus 8 inch edger
45 minutes runtime
Lifetime shaft warranty
Pros
- Highest average rating in the roundup with a 4.6 average
- Brushless 56V head slices dense grass without bogging
- One power head drives both the 16 inch trimmer and 8 inch edger
- Carbon fiber shafts carry a lifetime warranty
- Works with existing 56V ARC batteries you may already own
Cons
- Back-heavy with the 4.0Ah pack mounted on the head
- Edger head only cuts in one direction with blade on the right
- Some units shipped with an unsharpened edger blade
- Newer models carry a smaller debris guard
This is the kit to buy when the growth is thicker than a string trimmer should be asked to handle. The 56V brushless power head drives a 16 inch carbon fiber trimmer attachment rated to cut dense grass and thick weeds without bogging, and it shares the same head with an 8 inch metal-blade edger attachment.
Because the metal blade needs no consumable, it is the cheapest way to keep a sharp edge year after year, and the guide wheel adjusts to 3 inches of edging depth. The multi-head quick connect is the reason owners stay inside this ecosystem.
Reviewers consistently frame this kit as a one-for-one replacement for gas equipment, which is a meaningful claim from people who owned gas tools first. The 16 inch attachment is the tallest-grass configuration in this roundup.
Runtime is up to 45 minutes with the 56V 4.0Ah pack on the trimmer attachment and up to 75 minutes on the edger attachment set to low, so the same battery serves two very different jobs. The IPX4 construction handles light weather, and the power head adds a two-speed selector plus a lock-off trigger.
There is a real handling caveat. With the battery mounted on the head, the tool is back-heavy, and the shoulder strap included in the box is not a nicety. A few owners also reported that newer production units ship with a smaller guard that let debris reach clothing.
When to switch from the line head to the blade
Use the line head for grass, weeds and fence lines. Switch to the blade head when stems are thick enough that the line snaps between passes, or when you are working at the boundary of a wooded area.
The metal blade is the reason this kit can handle growth that defeats every line-only tool here, and it is the honest answer for anyone clearing bramble or scrub.
Who should skip it
Skip it for a small lawn. This is the largest and heaviest kit in the roundup, priced accordingly, and a resident of a tidy suburban lot will use the edger attachment far more than the brush-clearing end.
Those with existing 56V ARC batteries get the strongest case here, since the cost of entry drops to a head and a charger.
8. WeGofly 21V 4-in-1 Trimmer – Lightweight Multi-Tool for Occasional Use
WeGofly 13″ Electric Weed Wacker, 4 in 1 Cordless String Trimmer/Lawn Edger/Lawn Mower/Brush Cutter with Steel Gears, 2×21V 6.0Ah Batteries & Charger, 5.2 LBS Lightweight Grass Trimmer for Yard Garden
13 inch swath
15000 rpm brushless
5.2 lb
Two 21V 6.0Ah batteries
Pros
- Lightest body here at 5.2 lb
- Two 6.0Ah batteries included which is generous for the class
- Four tools in one including a mini mower and brush cutter
- 15000 rpm brushless motor with steel gearing
- Accessories
- spares and a storage bag in the box
Cons
- Line does not stay seated on the head reliably
- Lowest rating in the group with a 12 percent one-star share
- Generic brand with no established service network
- One owner reported the unit separating during use
The specification sheet here is genuinely surprising: 15000 rpm brushless motor, steel gear set, a 13 inch cutting width, and two 21V 6.0Ah batteries plus a charger in the box. On paper that is more than most comparable tools at double the cost.
At 5.2 lb it is the lightest unit we tested, and the telescopic pole and adjustable head make it workable for a range of heights. Seniors and first-time buyers single out the weight as the reason they finished a whole job without stopping.
The four-in-one design includes a string trimmer, lawn edger, mini mower and brush cutter head, with replacement blades, spare line, a storage bag and installation tools in the box.
Here is the honest part. The line retention on the head is a recurring complaint, and several reviewers say the line does not stay seated reliably. The 12 percent one-star share is the highest in this group, and a small number of owners report build consistency problems.
Consensus treats this as a light-duty and occasional-use machine. That is fine for post-mow tidying and keeping paths clear around a home, and the two 6.0Ah packs give you more working time than most single-battery kits in the roundup.
The warranty is 3 years on the machine and 2 years on the batteries, and the batteries use the common 21V interface, so packs are not locked to one brand name.
How the four heads actually differ
The string head handles grass and weeds, the edger head cuts a defined border along paths, the mower head covers small flat patches of lawn, and the brush cutter head takes on light scrub and saplings.
Swap between them without tools, which is the whole point. The mower head is the one most owners try first and use least.
Who should skip it
Skip it if tall grass is the reason you are shopping. The line that will not stay seated is exactly the failure that shows up under sustained load in dense growth, which is the one condition you care about most here.
It also suits anyone without a local parts network who prefers a brand with established service and consumable availability.
9. WORX Nitro WG186.9 40V – Gas-Like Power in a Cordless Body
Worx Cordless String Trimmer, 40V 15″ Electric Weed Wacker, WG186.9
15 inch dual-exit head
Brushless motor
40V tool only
8.8 lb
0.0905 inch line
Pros
- Owners compare the power favourably to 25cc gas units on thick growth
- 15 inch dual-exit head runs two lines at once
- DRIVESHARE shaft accepts other brands' heads
- ECO mode and variable speed extend runtime and line life
- Compact guard collects less wet grass than oversized guards
Cons
- Battery and charger are not included
- 8.8 lb with a single strap that owners find inadequate
- 4.0Ah packs give only 30 to 40 minutes at full throttle
- The easy-load head is genuinely hard to thread
- Guard does not fully block small stones
This is a tool-only package, and that fact changes the whole calculation. You are buying the power head and shaft, then supplying your own Power Share Pro batteries and charger, which is why owners always say to budget for those before the purchase rather than after.
What you get is a 15 inch dual-exit head that runs two lines at once, a brushless motor the brand rates at 25 percent more power than a brushed equivalent, and a DRIVESHARE split shaft that accepts brush cutter, hedge trimmer and pole saw heads, including from other brands.
Several owners switched from gas and rate it as equal or better on thick grass, blackberries and bamboo. The supplied 0.0905 inch line suits medium to heavy duty cutting, and one long-term owner reported that 0.080 square line cut better than the stock line in their conditions.
The ECO mode on the variable speed trigger is more useful than it sounds. It slows the head for fence lines and bed edges, which extends runtime and reduces line snapping on thin stems.
The three consistent complaints are worth weighing before you buy. The supplied single shoulder strap digs in on a tool this size, and many owners upgrade to a two-shoulder harness. The easy-load head is genuinely difficult to thread. And the guard does not fully stop small stones, so eye and face protection is not optional here.
Whether the tool-only format suits you
It suits you if you already run 40V Power Share Pro tools, because the batteries and charger you own will drive this head. It also makes sense for anyone building a multi-tool setup around a single platform.
It does not suit a first-time buyer. Add the cost of at least one 4.0Ah or 5.0Ah pack plus a charger and a harness to the headline figure before you compare it against full kits.
Who should skip it
Skip it if your property is small. An 8.8 lb tool with a dual-exit head and a bulky guard is awkward in tight flower beds, and the head limits how closely you can trim around obstacles.
It is a poor match for anyone who needs one tool that works immediately with nothing else to buy.
10. PowerSmart 25cc Gas Trim and Brush Kit – Unlimited Runtime
PowerSmart Gas Weed Wacker 2-Cycle 25cc Gas String Trimmer/Edger 16″ and 10″ Brush Cutter & Shoulder Strap Included
25.4cc 2-cycle engine
16 inch swath
0.095 inch line
10 inch metal brush blade
18.7 lb
Pros
- Unlimited runtime with no battery planning or waiting
- 25.4cc engine clears knee-high grass and heavy brush
- Both a line head and a 10 inch metal brush blade in the box
- Low vibration and a shoulder strap keep an 18.7 lb machine workable
- Compact breakdown design for storage
Cons
- Lowest average rating in the group at 4.0 with an 18 percent one-star share
- Reports of a broken handle and a breakdown inside the first hour
- One unit arrived with a broken choke switch
- Assembly instructions are confusing
- 2-cycle fuel mixing adds maintenance
Nothing else on this list runs indefinitely. A 25.4cc 2-cycle engine with a 16 inch swath and 0.095 inch line will clear knee-high grass and heavy brush for as long as the fuel lasts, and for genuinely large overgrown ground that continuity is worth more than any battery platform.
The kit includes a 10 inch metal brush blade for bramble and brush work, so the same power head crosses the line into brush cutting territory. The shoulder strap is included and matters at 18.7 lb.
Owners who receive a working unit praise the cutting power, the included blade, low vibration compared with many gas trimmers, and the fact that no battery planning enters the job.
Now the other side. This has the lowest average rating in the roundup and an 18 percent one-star share, the highest here. Reports include a broken handle, a breakdown within 45 minutes of first use, and a unit that arrived with a broken choke switch. Assembly instructions confuse enough owners that several skipped them and worked it out by hand.
Two-cycle engines also need fuel and oil mixed, which is a maintenance routine every battery tool removes. Plan for that before treating gas as the simple option.
Where gas genuinely wins is acreage. Clearing a vacant lot or a field edge where a single charge would end the job is where this class earns its keep.
When gas still makes more sense than a battery
Choose gas when the job outlasts a charge: several hundred square feet of dense, dry growth in one sitting, or backland work far from an outlet. Continuous torque at a wide swath is the honest reason crews still reach for an engine.
Choose gas also if you already run a 2-cycle tool and understand the fuel and starting routine. Then none of it is a new habit.
Who should skip it
Skip it if quiet operation, neighbours or emission rules are a factor, and skip it if you dislike mixing fuel. Early morning use is where electric clearly wins.
With an 18 percent one-star share, inspect the machine as soon as it arrives and know your local service options before you need them.
11. HortiHub 21V Cordless Trimmer – Small Yard and Edge Specialist
Electric Weed Wacker Eater Cordless Battery Powered String Trimmer Whacker
12 inch swath
9000 rpm
5.3 lb
Two 2.0Ah batteries
15 to 20 minutes each
Pros
- Lowest entry cost in the roundup with a 4.4 average rating
- 5.3 lb body with adjustable handle suits seniors and beginners
- Two batteries included so you swap instead of waiting
- Tool-free assembly gets you cutting within minutes
- Safety goggles and a reinforced guard are included
Cons
- Runtime of roughly 15 to 20 minutes per 2.0Ah pack
- 12 inch swath and 9000 rpm suit a small yard
- Nonstandard battery form factor limits cross-brand packs
- Generic brand with no established service network
The cheapest tool in the roundup also ships with safety goggles, which almost nobody else at this level does. That detail tells you something about how the design prioritised safety on small-yard work.
At 5.3 lb with an adjustable handle, this is one of the two lightest options here, and reviewers repeatedly describe it as friendly to seniors, women and complete beginners. Assembly is tool-free, so you are cutting within minutes of opening the box.
Line advance is automatic, releasing 0.4 to 0.5 inch increments on start and from a release button. Extend the line to about 6 inches before the first cut, then add length as needed.
The limits are clear and stated by owners. Each of the two 2.0Ah packs gives roughly 15 to 20 minutes, the 12 inch swath is a small-yard dimension, and the 9000 rpm head is not a tall-grass ceiling. Buyers consistently frame it as an edging and tidy-up tool.
Because two batteries are included, the swap keeps you working. The batteries use a nonstandard form factor, so cross-brand pack compatibility is limited, and there is no established service network behind the brand.
How small is small enough for this tool
It handles paths, edging around beds, driveway margins and post-mow cleanup on a typical suburban lot. The quiet, dampened motor is the reason owners mention early morning use, and the reinforced guard plus included goggles cover the two most common complaints on light trimmers.
Anything beyond that means swapping tools, not swapping batteries.
Who should skip it
Skip it if you have more than a small yard, or if knee-high grass is already your normal condition. Fifteen to 20 minutes per pack turns any real clearing job into a charging schedule.
It is also a poor choice for anyone who wants to buy spare batteries in three years, since the form factor is not a standard interface.
12. Greenworks 60V 16 Inch Trimmer – Wide Cut for Big Overgrown Areas
Greenworks 60V 16 in Cordless String Trimmer, 4.0 Ah Battery
16 inch swath
10000 rpm brushless
18.7 lb
4.0Ah battery
4 year warranty
Pros
- Owners repeatedly compare the power to a 25cc gas trimmer
- 16 inch swath is the joint widest in this roundup
- Two-speed trigger lets you creep along fences without shredding them
- 4.0Ah pack holds about an hour on low
- Attachment capable with a 4 year tool and battery warranty
Cons
- Heaviest cordless option here at 18.7 lb
- Top-mounted battery makes it feel top-heavy in beds
- One reviewer reported a loud fan and a faint burning smell from the charger
- Sound is not as quiet as the marketing implies
Head speed and swath are both maximal here: a 60V brushless motor turning 10000 rpm behind a 16 inch cutting path. Owners describe it as blasting through tall dense weeds and compare the result to a small gas engine, including one commercial user who switched from a much more expensive gas trimmer.
The two-speed variable trigger earns its place daily. Low speed along a chain-link fence or a wall avoids shredding the mesh and cutting the grass short, while high speed takes the thick patches. The Load N Go head simplifies line changes.
The 4.0Ah pack holds about an hour on the low setting according to owners, and the kit includes the battery, charger, spool and an adjustable shoulder strap. The warranty runs 4 years on both tool and battery, and the shaft is attachment capable.
Handling is the honest drawback. At 18.7 lb with the battery mounted high on the shaft, it is the heaviest cordless tool here and reviewers describe it as top-heavy and swingy in flower beds. It needs a properly adjusted strap and a confident grip.
The review base is also the smallest in this roundup at 169 ratings, so there is less long-term evidence behind it than the 4.3 average suggests. One reviewer reported a loud charger fan and a faint burning smell, which is worth watching on your own unit.
How to control the weight
Adjust the strap so the tool hangs balanced at hip height, and lift rather than swing when the head is still. Tall growth hides rocks and roots, and a light trimmer bounces, while a heavy one ploughs.
Use the low speed setting for travel between clumps and the high setting only for the cut itself, which reduces fatigue noticeably on a long afternoon.
Who should skip it
Skip it if you are smaller, older, or working around delicate beds. The weight and the top-heavy balance make precision work difficult, and it is the least suitable option here for delicate edging.
It earns its place on large properties with big patches of overgrown ground where a 16 inch pass and about an hour of low-speed runtime make the job finish in an afternoon.
How to Choose a String Trimmer for Tall Grass
The single biggest decision is not the brand. It is whether your battery, your property size and your growth height line up, and most disappointing trimmers are a mismatch between those three rather than a bad machine.
Match the power to the growth, not the box
Tall grass fails cordless trimmers in a specific way. The head bogs, the motor stalls, and the stems bend forward instead of snapping, so the grass is pushed over rather than cut. Every fix for that comes down to the same three numbers: head speed in rpm, cutting swath in inches, and the torque available at the head.
Above 8000 rpm with a 15 or 16 inch swath and 0.0905 or 0.095 inch line, you can handle knee-high growth and stalky weeds. Below 7000 rpm with a 12 inch swath and 0.065 inch line, you are buying a maintenance tool for lawn edges. Neither is better; they are different jobs.
How much ground can one charge clear?
Use the published runtime as a ceiling and halve it for dense work. A 4.0Ah pack rated at up to 60 minutes on light trimming typically gives you a fraction of that in standing growth, which is why owners of the units in this roundup almost universally buy a second battery before a big clearing job.
For planning, one charge comfortably covers normal fence line and edge maintenance on a suburban lot. Clearing a neglected lot or field edge in a single session is where a gas engine or a bigger pack becomes the honest answer.
Straight shaft or curved shaft, settled
This is the most repeated question across every trimmer forum, and it is worth answering directly. A straight shaft puts the full torque through a rigid line from motor to head, reaches further into thick growth without you leaning, and is what most operators use for brush work. A curved shaft puts the motor below your hand, which shortens the lever, reduces fatigue on light trimming, and feels awkward when you are pushing into tall growth.
Most buyers who later regret a curved-shaft trimmer regret it for the same reason: the reach is too short to cut into a dense stand without bending at the waist. If tall grass is your normal condition, a straight or telescoping shaft is the better bet. If you mostly trim edges and care about comfort over a long session, a curved shaft is defensible.
Which line to run in thick grass
Line gauge matters as much as the motor. Round line in 0.065 inch suits ordinary lawn trimming. For tall, thick growth, step up to 0.080 or 0.095 inch line, and square or mill profile cuts harder and resists snapping better than round at the same diameter.
Two cautions. Thicker line needs a head and a power source rated for it, so check the spool and the manufacturer line specification before winding on 0.095. And a wider cutting swath plus thicker line is what reduces passes, not more throttle, and overloading a thin head is how people break trimmers.
How to actually cut tall grass
Knock the top growth down first rather than attacking the whole stand at once. Walk the area with the head held high and angled forward, cutting only the top third, then drop your angle and take the next third. Repeat until you are at your normal trimming height.
Work in short, overlapping side-to-side passes, keep the head moving the whole time, and cut on the forward sweep so the stems lean away from you. Hold the debris guard between your legs and the growth, and keep the head spinning fast enough to hear the difference between a clean cut and a struggling motor. If the sound drops, you are going too slowly, so change the angle of attack instead of leaning harder.
Cut away from fences, windows and people, and never cut where you cannot see the base of the stems.
When a string trimmer is not enough
Escalate when stems are woody, when the line snaps between passes, or when the stalks are thicker than a finger. At that point the answer is a blade head or a brush cutter with a 3-inch cutting width, and the two kits in this roundup that include a metal blade are the ones built for that step.
For a scythe, the honest case is large areas of fine, dense grass rather than weeds. It cuts far faster with a sweeping motion, produces almost no noise, and demands a technique that takes practice to learn properly.
What pros actually reach for
On commercial jobs the pattern is consistent. Crews running Echo and Stihl gas equipment describe those machines as daily drivers that handle anything thrown at them, and professionals working taller ground lean toward commercial gas trimmers or a brush cutter outright. Within cordless, Makita and 40V-class platforms come up repeatedly as the working alternative.
The consensus point is not that gas is better in every case. It is that professionals cut more grass per day than a homeowner ever does, so the tool that never stops wins their vote, while the homeowner cutting a fence line twice a month gains more from silence and no fuel mixing.
Frequently Asked Questions
What is the best string trimmer for tall, thick grass?
The EGO ST1623T is our pick for tall, thick grass because its 16 inch Line IQ head holds a full swath while the brushless motor keeps the line spinning, and POWERLOAD reloads the head in seconds so you lose no time in dense growth. The WORX WG163 is the best all-rounder for a normal lot, but neither tool is a brush cutter. Once stems turn woody, switch to a blade head.
What is the best weedeater for tall grass?
For knee-high grass, look for at least 8000 rpm of head speed, a 15 or 16 inch cutting swath and 0.0905 or 0.095 inch line. A brushless motor matters because it stays cool under sustained load. Anything with 0.065 inch line and a 12 inch swath is an edging tool, not a tall-grass tool, however good its rating.
How to whipper snip tall grass?
Knock the top third down first with the head held high, then lower your angle and repeat until you reach normal trimming height. Work in short overlapping side-to-side passes, keep the head moving, and cut on the forward sweep so stems lean away from you. If the motor sound drops, change your angle rather than pressing harder.
Is Echo or Stihl better?
Both are long-established gas brands with strong parts networks, and professionals name them as daily drivers. For most homeowners the difference is noise, fuel mixing and maintenance rather than cutting ability, which is why the cordless picks in this roundup win on maintenance. Choose between them on local dealer support and parts availability more than on cutting speed.
What is the best string trimmer line for heavy weeds?
Use 0.080 or 0.095 inch line for heavy weeds, and choose a square or mill profile because those cut harder and resist snapping better than round line at the same diameter. Stay on 0.065 inch round line for ordinary lawn edges. Check that your head and tool are rated for the thicker gauge before you wind it on.
Do I need a brush cutter instead of a string trimmer?
Yes, when stems are woody, when the line snaps between passes, or when growth is thicker than a finger. A brush cutter with a 3-inch cutting width and a metal blade is built for that work, and a scythe is the right tool for large areas of fine dense grass. For grass and light weeds below knee height, a string trimmer is faster and easier to control.
Who makes the most reliable string trimmer?
Reliability tracks the category rather than one brand. Premium platforms such as EGO and Husqvarna back their tools with multi-year warranties and long shaft coverage, while established gas brands win on parts availability. On the budget end, warranty length matters most, because lighter motors and plastic housings are where failures concentrate. Check local service before buying any brand new to you.
Which String Trimmer Is Right for You
Our winner is the WORX WG163. It is the best string trimmer for tall grass on an ordinary lot because the numbers back it up, at 4.3 stars across more than 28,000 reviews, with a 12 inch swath, push-button line feed, two batteries and a 5.5 lb body, none of which leaves a gap in day-to-day use.
If your grass is genuinely knee-high or thick with weeds, take the EGO ST1623T instead. The 16 inch Line IQ swath and POWERLOAD loading are the two features that directly reduce the friction of long afternoon sessions in dense growth.
If you are clearing brush, bramble or anything with woody stems, the EGO MHC1603 multi-head kit is the only pick here with a metal blade, and it is the setup that replaces a gas machine rather than arguing with one. If you need runtime measured in hours rather than minutes, the 25.4cc gas kit is the honest answer, with the build inconsistency in its reviews as the cost of that choice.
Everyone else should start with weight, noise tolerance and how much grass actually needs cutting, then pick from there. Check the current listing for any of these before you order, and re-check the line gauge advice once the growth is in front of you.