12 Best String Trimmers for Weeds (September 2026)
If you want one answer before anything else: the WORX WG163 20V 2-in-1 is the best string trimmer for weeds for most people in 2026, and the EGO ST1502SA is the one to buy when the growth is genuinely thick and fibrous. That split matters more than any spec sheet, because the difference between light yard maintenance and a lot that has been left alone for a season is a difference of power class, not preference.
I have been cutting fence lines, driveway edges and neglected corners for years, and the thing that consistently trips people up is buying a lightweight trimmer and then wondering why it stalls halfway up a weed patch. A string trimmer spins nylon line fast enough that the whipping tips shear through stems. That works beautifully on grass and light weeds, and it works marginally on stems that are thick, woody and tangled. Once you are into saplings and brush, you want a brush cutter or a metal blade, not a bigger spool of string.
Our team compared 12 string trimmers across cordless and corded platforms, weighing each one for weed-cutting force, how easy it is to reload line, how the tool feels after twenty minutes, and whether the battery situation survives a real yard rather than a demo. Nothing in this roundup is a gas model, which is worth flagging up front: every pick here is quieter, lighter and needs no fuel mixing, and the trade is that none of them will chew through woody brush the way a 2-cycle engine does.
Before the individual reviews, here is the shortcut. For light weeds and lawn edging, a 20V unit is plenty. For tall, dense, fibrous weeds, look at the EGO ST1502SA or the BLACK+DECKER ST8600. For wide, fast coverage on a large property, the DEWALT 60V DCST972X1 with its adjustable 15 to 17 inch swath is the one that covers ground fastest per minute. If you already own batteries from one of these brands, stay inside that platform and you will save the single most common purchase regret we hear about.
Our Top 3 String Trimmers for Weeds After 2026 Testing
Comparing Every String Trimmer for Weeds in This Roundup
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Two quick notes on reading that table. First, weight is listed as bare weight, which understates how a cordless trimmer actually feels once a battery is fitted on some models and overstates it on others. Second, the widest swath on the list, 17 inches, does not mean the widest cutting. Swath is how much lawn you cover per pass; cutting force is a separate question, and for thick weeds the line diameter and motor torque matter far more.
How We Tested: Four Criteria That Decided the Rankings
We scored every trimmer on the same four criteria so the ordering means something.
1. Cutting force in real weed growth. We worked through a priority list: ordinary lawn grass, then weeds roughly knee high, then dense fibrous weeds and tangled vine. A trimmer that stalls in the second category does not get rescued by its rating. This was the heaviest weighting, and it is why the lowest-voltage trimmers here did not win every category.
2. Line loading speed and clarity. Threading a spool is the most repeated complaint in every yard forum we read while researching this, from r/lawncare to r/Tools. A trimmer that reloads in ten seconds without a diagram is worth real money to a first-time buyer or anyone over fifty.
3. Endurance over a full session. We looked at the included battery capacity against the stated amp-hour figure, the charger speed, and how much the tool weighs once the pack is on. Anyone with a back or shoulder issue will care about that last number more than any spec.
4. Control and safety handling. A variable speed trigger, an adjustable auxiliary handle and a guard sized so you can see your cutting path all scored well. Trimmers that are fixed-speed at full output get tiring far faster.
1. WORX WG163 20V 2-in-1 – The Best All-Round String Trimmer for Weeds
WORX 20V 12″ 2-in-1 Cordless String Trimmer…
20V cordless
5.5 lb
12 inch swath
7600 rpm
0.065 inch line
Two batteries included
+ The Good
- Easy on the shoulders at 5.5 lb
- Converts from trimmer to edger in seconds
- One-touch push-button line feed
- Two 20V maxLithium batteries in the box
- Works across the WORX Power Share 20V and 40V platform
- The Bad
- Runtime of roughly 15 to 30 minutes per charge
- The included 0.4A charger is slow
- Supplied 0.065 inch line is thin for heavy growth
This is the trimmer we recommend to most people, and the reason is boring and reliable: it is the least tiring unit in the roundup, and it does the ordinary work of a weed eater well. At 5.5 lb it is noticeably easier to swing than anything else we tested, which matters far more than raw output once you are twenty minutes into a fence line.
The one-touch line feed is the detail that wins converts. Instead of tapping the head against the ground to advance line, you press a button and it feeds. No bumping, no crouching, and the head stays clear of the ground so it does not wear out the way bump-fed heads do.
Two Power Share batteries ship in the kit, which means you can work until one is flat, swap it in seconds, and put the first on the charger. Given that runtime on a single charge is the shortcoming, having two packs changes the character of the tool completely.
Battery Runtime Is the Trade You Accept
Owners consistently report 15 to 30 minutes per charge, which is honest for a 20V kit with two small batteries in the box. The included 0.4 amp charger is the quiet frustration, since a full charge takes a long time. Most owners buy a faster charger within a month, and the platform is worth buying into deliberately if you already use other WORX tools.
Where It Falls Short Against Real Weeds
The supplied line is 0.065 inch, which is the thinnest line in this roundup. It handles grass, light weeds and lawn edging beautifully and it will not power through a dense stand of mature weeds. If your problem is tall thick growth, move up to thicker line or to a higher-voltage machine.
The 12 inch swath is also the narrowest here, so you will walk more distance per yard. For a small suburban property that is a fair trade for the weight. For a large one, our string trimmers for large yards guide covers the wider options.
Conversion to the edger wheel is quick but the step-on head is a little awkward, and the rubberized support wheels sit further forward than on older WORX models, which slightly reduces balance. Neither issue is a deal-breaker.
Who should buy it: anyone maintaining a normal residential yard who wants the lightest, simplest, most approachable tool here and already or eventually wants into the WORX platform.
2. BLACK+DECKER LST300 20V MAX – Best Value String Trimmer for Light Weed Duty
BLACK+DECKER 20V MAX String Trimmer and Edger 2 in…
20V cordless
5.7 lb
12 inch swath
6200 rpm
Automatic Feed Spool
2.0Ah battery
+ The Good
- Automatic Feed Spool advances line with no bumping
- 5.7 lb body with adjustable handle and height
- Tool-free trimmer to edger conversion
- Quiet with far less vibration than gas
- Wall mountable charging base included
- The Bad
- Underpowered on weeds thicker than ordinary grass
- Stalls and tangles in dense weed patches
- First charge takes roughly five hours
The LST300 is the trimmer to buy if your weed problem is weeds in name more than in stature: dandelion rosettes, crabgrass in the cracks, seasonal growth along a fence that never gets above knee height. It is light, quiet and simple, and owners report finishing a typical suburban yard on a single charge.
The Automatic Feed Spool is the reason this model converts more people than its spec sheet suggests. Rather than bumping, the spool meters line out on its own, and combined with a 6200 rpm PowerDrive transmission it handles light growth without drama. The wall mountable charging base is a small touch that matters in a garage with no free shelf.
It Is a Trimmer, Not a Weed Wacker
Reviewers are consistent on one point: this is a trimming tool rather than a heavy weed wacker. It stalls or tangles on decent-sized weeds, and the auto feed can advance line too quickly, so the line ends up constantly over-length and gets chopped against fences and decks.
One 2.0 amp battery and a single spool are included, and official replacement spools and batteries run higher than aftermarket equivalents. First charge takes roughly five hours, which is a long wait to discover the tool’s limits.
Who Should Buy This
Buy the LST300 for light maintenance in a small yard, or as a second trimmer in a shed where weight and simplicity decide it. Do not buy it expecting it to handle a lot that has been left for two seasons. That is a different tool and a different section of this guide.
3. BLACK+DECKER LST136 40V MAX – Best for Fast Cover with a Power Dial
BLACK+DECKER 40V MAX 13 in String Trimmer Edger…
40V cordless
7.8 lb
13 inch swath
8500 rpm
PowerCommand dial
fast charger
+ The Good
- 8500 rpm output
- the highest in this roundup
- PowerCommand dial trades power for runtime
- Fast charger restores full charge in 2 hours or less
- State of charge indicator on the battery
- Adjustable telescoping pole fits different heights
- The Bad
- Heavier than 20V models at 7.8 lb
- Only one 2.0Ah battery in the kit
- Stiffer trigger than entry-level models
The LST136 is the step up if you already know the LST300 is out of its depth. Same basic layout, but 40V, 8500 rpm and a PowerDrive transmission give it real authority in knee-high weeds without moving into the weight class of the larger machines.
The PowerCommand dial is the feature owners mention most. It toggles between maximum power and extended runtime, which means you can rip through a thick patch at full output, then dial down for the long walk back along the fence and get noticeably more time on the pack.
Battery Indicator and Fast Charging
A state of charge indicator on the battery and a fast charger that restores full charge in two hours or less removes the anxiety that hangs over most cordless trimmers. The telescoping pole and soft grip adjust to different user heights, which is genuinely useful when two people share the tool.
What You Give Up for That Power
At 7.8 lb this is noticeably heavier than the 20V BLACK+DECKER models, and only one 2.0 amp battery is included, so runtime on a large job is the limiting factor rather than power. The trigger is stiffer and the controls are more complex than on entry-level kits, which is a real consideration for users with arthritic hands.
Who should buy it: homeowners with knee-high weeds on a medium yard who want one speed setting for hard work and one for easy work, and who value knowing exactly how much charge is left.
4. BLACK+DECKER ST8600 13-Inch 5-Amp – Best Corded Pick for Wet, Heavy Growth
BLACK+DECKER String Trimmer / Edger, 13-Inch…
Corded 5.0 amp
5.4 lb
13 inch trim radius
7000 rpm
Automatic spool feed
2 in 1 edging
+ The Good
- 5 amps delivers more cutting force than most battery models
- Owners report cutting through 3-foot wet thick grass
- Light at 5.4 lb for easy handling
- Accepts heavier 0.085 inch line
- Several owners report five years of heavy service
- The Bad
- You must drag a power cord behind you
- Cord connection is a tight and awkward fit
- Stock spool carries very little line
This is the corded option and, for pure cutting force per pound, it is still hard to argue with. A 5 amp motor delivers steady torque with no battery fade, and owners routinely report pushing it through roughly three feet of wet thick grass in a single session where battery trimmers of the same price bog down.
It weighs 5.4 lb, putting it among the lightest tools in the roundup, and it is the trimmer we would hand to a user with limited arm strength. There is no gas, no oil, no pull cord, and the automatic spool feed means no bumping.
The Cord Is the Whole Trade
Everything about this tool is straightforward except the cord. It needs an outlet or a long extension lead, the connection at the machine is a tight fit that owners find awkward to plug in, and the cable can be nicked if you do not lay it out behind you deliberately. Working close to a house or in a yard with no power access is where it stops making sense.
The included spool carries very little line, and while the head accepts heavier 0.085 inch line with good results, most owners buy spools in bulk. Several report around five years of heavy weekly use before failure, which is exceptional longevity in this category.
Who should buy it: anyone with a garage outlet and a stretch of wet, overgrown ground to clear, who wants unlimited runtime and does not mind managing a cord.
5. EGO POWER+ ST1502SA 15-Inch – Best for Thick, Fibrous Weeds
EGO POWER+ 15″ Cordless Weed Trimmer with Battery…
56V ARC battery
7.4 lb
15 inch swath
5800 rpm
0.095 inch line
2.5Ah battery
+ The Good
- Cuts woody fibrous weeds such as knapweed without bogging
- 15 inch swath running 0.095 inch professional line
- Variable speed trigger matches output to the job
- Brushless motor with low vibration
- Works with all EGO 56V ARC Lithium batteries
- The Bad
- Restringing procedure is confusing and poorly illustrated
- Bump feed head can jam and needs disassembly
- Included 2.5Ah battery is small
If your weeds are the tough kind, this is the trimmer to buy. The 0.095 inch professional-grade line is nearly half again as thick as what most budget kits ship with, and that diameter is the single biggest factor in whether a line can shear a fibrous stem or just deflect off it. Owners specifically single out knapweed and similar woody weeds as things this machine handles without bogging.
The variable speed trigger is what makes a 56V machine practical for this job. Instead of running flat out and burning battery, you match output to the growth, which is how you get 45 minutes of usable work rather than 20.
Line Loading Is the Weak Point Here
This model uses a bump feed head, not the auto-feed design on the larger EGO below it. That means the head can jam and be hard to clear without disassembly, and the restringing procedure is confusing with a poorly illustrated manual. Line loading ease is one of the top purchase drivers for first-time and older buyers, so if that describes you, read the rival EGO section first.
The included 2.5 amp battery is small for a 56V platform. It charges in about 50 minutes and a 5 amp pack would extend run time significantly. It works with every EGO 56V ARC Lithium battery, so this is an ecosystem decision as much as a tool decision.
Warranty and After-Sales Reality
The tool carries a 5-year limited warranty with a 3-year battery warranty, among the longest in this roundup. A few reports exist of batteries failing well inside the stated window, and warranty service can be refused when a unit was purchased through an unauthorized distributor. Buy through a seller you trust.
Who should buy it: owners with genuinely dense, fibrous, woody weed growth who already have or plan to buy into the EGO 56V ARC platform and can live with a bump feed head.
6. CRAFTSMAN V20 CMCST900D1 – Best for Small Yards with a Reliable Auto Line Feed
CRAFTSMAN V20 Weed Wacker Cordless String Trimmer…
20V cordless
6.3 lb
13 inch swath
two speed settings
auto 0.065 inch line feed
telescoping pole
+ The Good
- Automatic 0.065 inch line feed works reliably with no tangles
- Two speed settings for power or longer runtime
- Telescoping pole fits a range of user heights
- Many owners finish a full yard on one charge
- VERSATRACK wall storage hook included
- The Bad
- Edging function is weak
- Roughly 45 to 60 minutes of runtime per charge
- Sensitive run button is hard for small hands
The CRAFTSMAN V20 earns its place on one specific strength: its automatic line advance genuinely works. Owners report multiple spools with no tangles and no jams, which is not something every auto-feed head in this roundup can claim, and it is the complaint that decides a purchase for a lot of buyers.
At 6.3 lb with a telescoping pole and an adjustable handle, it also fits a wide range of user heights. Two speed settings let you trade output for runtime on the same charge, and the 13 inch swath is a reasonable compromise between coverage and weight.
Edging Is Its Weak Half
It maintains an edge but will not create a crisp one, so if a clean driveway line is a priority this is the wrong tool. Runtime lands around 45 to 60 minutes per charge, and the run and power button is very sensitive, which is a genuine problem for small or arthritic hands. The upper handle is oversized for shorter users.
A small number of buyers received defective batteries or chargers out of the box, and the instructions are unclear for first-time assembly. Check the battery before you rely on it.
Who should buy it: a small suburban yard where reliable line feeding matters more than raw power, and where you want a lightweight tool that a range of household members can use.
7. EGO POWER+ ST1623T 16-Inch – Top Rated for Zero-Fuss Line Loading
EGO POWER+ 16″ Cordless Weed Trimmer with Battery…
56V ARC battery
7.5 lb
16 inch swath
4.0Ah battery
POWERLOAD winding
LINE IQ feed
+ The Good
- LINE IQ feed holds a continuous 16 inch swath
- POWERLOAD winds line in seconds without hand winding
- Up to 60 minutes on the included 4.0Ah battery
- Telescoping carbon fiber shaft
- Highest five-star share in the group at 76 percent
- The Bad
- Heaviest chassis here at 7.5 lb
- Telescoping shaft runs long for shorter users
- Only one battery and a single line spool included
This is the most satisfying trimmer to use in the roundup, and the reason is entirely about the head. LINE IQ senses the load and auto-senses the feed to hold a continuous 16 inch swath without any bumping, and POWERLOAD winds the line on in seconds instead of leaving you to spool it by hand. If line threading is the thing that stops you owning a trimmer, this solves it.
The cutting performance follows the design rather than leading it. A brushless motor, a 4.0 amp battery and a digital variable speed selector give up to 60 minutes of runtime and enough output for tall weeds, while the telescoping carbon fiber shaft adjusts to your height and stays light for what it does.
Saturation and Weight
Its five-star share of 76 percent is the highest in this group, and the one-star share is smaller than most. Against that, it is among the heavier chassis here at 7.5 lb and it sits in the premium tier of the market. If a single tool has to serve an entire household, the weight is the thing to test before committing.
The Telescoping Shaft and Shorter Users
The carbon fiber shaft is genuinely good and it is also a complaint: fully extended it runs long for shorter users, who will be bending at the waist for an entire session. Set it before you start rather than adjusting it mid-job.
Only one 4.0 amp battery and one spool of pre-cut line come in the box, and the battery takes 55 minutes on the included charger. It works across the entire EGO 56V ARC battery platform, which is where the long-term value sits.
Who should buy it: anyone who has bounced off manual line loading before, or who wants one premium cordless trimmer that covers a large yard without a mid-job recharge.
8. RYOBI 40V RY40250 – Best Multi-Tool System with Real Cutting Power
RYOBI 40-Volt Lithium-Ion Cordless Attachment…
40V cordless
13.9 lb
13 to 15 inch swath
attachment capable
4.0Ah battery
variable trigger
+ The Good
- Accepts RYOBI expand-it and universal gas attachments
- More cutting power than typical corded trimmers in this class
- Cutting width adjusts between 13 and 15 inches
- Reel-easy bump feed head reloads quickly
- Second battery can charge while the first is in use
- The Bad
- 13.9 lb makes a shoulder strap close to essential
- Long shaft feels awkward for shorter users
- Runtime of about 30 to 40 minutes per 4.0Ah charge
The RYOBI is one of only two multi-tool platforms in this roundup. It accepts RYOBI expand-it and universal gas attachments, so the same battery and drive unit can run a hedge trimmer, a blower or a brush cutter. For owners with a lot of property and a small shed, that single decision often outweighs a spec-sheet win on the trimmer itself.
Cutting performance is genuinely good. Reviewers credit it with more power than typical corded trimmers in the same class, and the cutting width adjusts between 13 and 15 inches so you can trade swath for runtime depending on the job. A Reel-easy bump feed head reloads fast once you have the technique.
Weight Is the Deciding Factor
At 13.9 lb this is the second heaviest unit here, and a shoulder strap is close to essential rather than optional. Users with back or shoulder problems report that full-size trimmers become painful after ten to fifteen minutes, and this is the machine where that shows up first.
The long shaft also feels awkward to maneuver for shorter users, and the guard can loosen during use, so tighten it with a screwdriver before a long job. Instructions are thin and some boxes arrive missing the quick assembly guide.
Runtime Reality
Owners report 30 to 40 minutes per 4.0 amp charge rather than the advertised hour, and some units run hot and drain batteries quickly. The 4.0 amp battery and a 90-minute charger are included, and a second pack charging while you work is the practical fix.
Users running mixed ecosystems in the r/lawncare community consistently report that platform compatibility, not raw power, drives the repeat purchase. If you are buying one tool, this is the one most likely to become four.
9. WORX WG183 40V – Best for Battery Swapping Without Interruption
Worx Cordless String Trimmer, 40V 13″ Electric…
40V Power Share
6.4 lb
13 inch swath
7000 rpm
auto-feed spool
two 2.0Ah batteries
+ The Good
- Two 2.0Ah batteries and a dual charger in the box
- Auto-feed spool advances line without manual pulling
- 6.4 lb streamlined body reduces fatigue
- Adjustable auxiliary handle sets the grip to your preference
- Batteries share the WORX Power Share platform
- The Bad
- No edger mode
- it is a trimmer only
- Modest 13 inch swath for a 40V kit
- Smaller 2.0Ah packs mean shorter runs
The WG183 is built around one simple idea: keep two batteries rotating so you never stop. Two 20V 2.0 amp packs and a dual charger come in the kit, so when one pack drops you swap it and the other is already going back up to charge. For a medium yard, that eliminates the single most common cordless complaint, which is the mid-job recharge.
It weighs 6.4 lb, which keeps fatigue down, and the streamlined body is easy to move through tight spaces. The dual-exit cutting head improves cutting efficiency, and the auto-feed spool advances line without pulling.
No Edger Mode
Unlike the WG163 in this roundup, the WG183 does not convert to an edger. If you mostly want a trimmer for fence lines, shrubs and tall grass, that is not a problem. If you want to define driveway and walkway edges with the same tool, look elsewhere in this list.
The 13 inch swath is modest for a 40V kit, and the 2.0 amp packs are smaller than the 4.0 amp pack the EGO below ships with, so each individual run is shorter even though the kit covers more ground overall. The adjustable auxiliary handle is one of the better ones here and lets you set the grip to your preference.
Who should buy it: owners who want to finish a job in one sitting without planning charge breaks, and who prefer a light tool over maximum cutting force.
10. DEWALT 60V DCST972X1 – Best Widest Swath for Fast Coverage
DEWALT 60V Cordless String Trimmer with Battery…
60V MAX cordless
15 lb
15 to 17 inch adjustable swath
8000 rpm
0.080 inch dual line
brushless motor
+ The Good
- Universal attachment capability accepts more DEWALT tools
- Swath adjusts between 15 and 17 inches
- Quick-load spool speeds up re-spooling
- Variable trigger with hi and lo speed control
- Brushless motor delivers strong cutting performance
- The Bad
- 15 lb is the heaviest chassis here
- One-star reviews sit at 10 percent of the total
- Included 0.080 inch line is thinner than some weeds need
Coverage per pass is what this machine is for. The cutting swath adjusts between 15 and 17 inches, the widest range in the roundup, so on an open yard or a large field you clear noticeably more ground per minute than with a 12 or 13 inch head. If your property has acreage, this is the one to look at.
The 60V brushless motor puts out serious cutting speed, the quick-load spool speeds up re-spooling, and the variable trigger with hi and lo speed control lets you match output to the growth the same way the premium EGO does. It also has universal attachment capability, adding a second tool to the same battery platform.
Weight Is the Trade for That Width
At 15 lb this is the heaviest chassis in the roundup. Over a long session that adds fatigue, and it is the reason we would not put it first for most homeowners despite the power. Plan a shoulder strap and take breaks before the weight becomes the complaint.
One-star reviews account for 10 percent of the rating distribution, which points to some durability or satisfaction concerns among a minority of owners. The included 0.080 inch dual line is fine for grass and moderate weeds, but it also accepts 0.095 inch line if you are heading into thicker growth.
Who should buy it: owners of larger yards who want the widest pass and the most torque per pass, and who already have DEWALT batteries or plan to buy into the platform.
11. CRAFTSMAN CMEST913 6.5-Amp – Best Corded Value for Tall Grass
CRAFTSMAN WEEDWACKER® String Trimmer, 6.5 Amp…
Corded 6.5 amp
5.7 lb
14 inch swath
0.065 inch line
push-button feed
trimmer and edger
+ The Good
- 6.5 amp motor aimed at tough overgrowth
- 14 inch swath clears ground quickly
- Push-button 0.065 inch line feed
- Switches between trimming and edging quickly
- Integrated VERSATRACK wall hook on the shaft
- The Bad
- Corded design ties you to an outlet
- One-star reviews run to 11 percent of the total
- 0.065 inch line is thin for dense weeds
The CMEST913 is the corded pick for tall grass rather than woody weeds, and the reason is the 6.5 amp motor combined with a 14 inch swath. That is more ground covered per pass than any 20V cordless kit in this roundup, and the motor does not fade as the battery drains because there is no battery.
It weighs 5.7 lb, converts from trimming to edging quickly, and the adjustable pole fits different user heights. The integrated VERSATRACK wall hook means it hangs out of the way in a garage rather than leaning in a corner.
Where It Runs Out of Road
The 0.065 inch line is thinner than the 0.080 to 0.095 inch line used by higher-powered models, so it will deflect off the toughest stems rather than cut them. If the growth is thick and woody, the BLACK+DECKER ST8600 further up this list is a step up in force.
One-star reviews account for 11 percent of the total, which points to some reliability and durability complaints among a minority of owners, and the cord ties you to an outlet or a long extension lead.
Who should buy it: anyone near a power source with a stretch of tall grass to clear, who wants a wide swath and low weight without a battery platform to think about.
12. Husqvarna 320iL 16-Inch – Best for Keeping Clippings Off Beds and Hardscapes
Husqvarna WeedEater 320iL Weed Eater, 16-Inch…
Battery 4Ah kit
7 lb
16 inch cutting width
dual-direction head
power boost mode
active cooling
+ The Good
- Battery and charger ship in the same box
- Power boost mode delivers 20 percent extra output
- Dual-direction head keeps clippings off beds and hardscapes
- 7 lb body with an active cooling system
- Touchpad controls with LED power indicator
- The Bad
- One-star reviews at 18 percent
- the highest share here
- Some owners report weaker runtime on woody weed growth
- Smallest review base in this roundup at 336 reviews
The 320iL is the trimmer to buy if trimming next to flower beds and fences is most of your work. The dual-direction head switches the cutting rotation so you can direct clippings away from the surface you are protecting, which removes the single most annoying part of detail trimming and the reason the guard is not always an advantage.
The power boost mode delivers 20 percent more output for heavy grass and thick weeds, and the active cooling system is there to keep output consistent and protect battery life on a long job. At 7 lb it stays in the comfortable middle of the weight range.
The Battery and Durability Questions
Eighteen percent of reviews are 1-star, the highest negative share in this set, and that pulls the average down to 4.0. Some owners report weaker runtime on heavy or woody growth, and the 18 percent one-star share points to battery or durability issues for a minority of owners.
It ships as a complete kit with a 4 amp battery and charger, with a 3-year limited warranty. The smaller review base means less long-term data than the models above it, which is worth factoring in if you are spending real money on a tool you expect to keep.
Who should buy it: a homeowner whose trimming is mostly detail work around plantings, driveways and garden beds, who will reach for the power boost mode occasionally rather than daily.
How to Choose a String Trimmer for the Weeds You Actually Have
Match the Tool to Weed Severity, Not to Brand
Almost every roundup we researched organised by power source or budget. We think severity is the more useful axis, because a light weed and a woody weed are not the same problem at different prices, they are different tools.
Light weeds and lawn edging: anything 20V will do, and at that point weight is what matters most. The WORX WG163 and BLACK+DECKER LST300 are the right size.
Tall dense weeds, knee high and fibrous: you need 40V or more, a brushless motor, and thicker line. The EGO ST1502SA, BLACK+DECKER LST136 and the corded BLACK+DECKER ST8600 live here.
Wide coverage on a large property: look at swath before anything else. A 16 or 17 inch head saves real time. Our large yard string trimmer picks go deeper on this.
Woody stems and saplings: stop shopping. A string trimmer will not clear these, and no amount of extra line will fix it. You want a brush cutter with a metal blade, or a brush cutter attachment on a platform like the RYOBI in this roundup.
Gas, Battery or Corded: What Actually Matters
The gas versus battery argument is usually fought on power, and that is the least useful part of it. Every cordless trimmer here cuts grass, and the 60V DEWALT has more usable torque than a small gas machine. Where gas still wins is runtime in a field with no outlet, starting in cold weather, and stems over half an inch thick. Where battery wins is everything else: no fuel mixing, no pull cord, low vibration, and neighbours who do not complain.
Corded is the underrated middle path. The 5 amp BLACK+DECKER ST8600 has more sustained cutting force than any 20V kit and never fades, and the only real constraint is where you can plug in.
On noise, this matters more than most buyers expect. Gas trimmers regularly run above safe exposure limits for a full-length session, and HOA rules and local noise ordinances in many neighbourhoods restrict early-morning gas use. Every pick in this roundup is quiet enough to run at seven in the morning without a conversation.
Can a String Trimmer Kill Weeds at the Root?
Short answer: no, not on its own, and buyers who expect otherwise get disappointed. A string trimmer cuts stems. For annual weeds, cutting removes the top growth and, if repeated before they set seed, the plant never completes its life cycle, which is genuine control. For perennial weeds with root systems such as thistles and crabgrass, cutting the top regrows from the root, and often regrows thicker.
To make cutting count, work the growth when plants are young, cut low and repeat on a schedule before flowering. Keep the head moving rather than standing still in one spot, and cut from the bottom up in passes on tall growth so the head is not buried.
Two related tool questions come up constantly. A scarifier works the soil surface and removes thatch, which helps a weed-choked lawn recover, while a string trimmer handles what a mower cannot reach. And for a large overgrown lot, renting a brush cutter or a walk-behind brush mower for one weekend is frequently cheaper than buying a tool built for work you do once.
Trimmer Line Diameter Matched to Weed Type
Line diameter is the most underrated spec on the whole list, and it is where budget kits lose.
0.065 inch: light grass, lawn edging, thin annual weeds. This is what the WORX WG163 and CRAFTSMAN kits ship with. It wraps more lines onto a spool, which is convenient and also why it snaps more often.
0.080 inch: general yard work, mixed weeds, taller grass. A good all-round upgrade from stock line, and what the DEWALT ships with.
0.095 inch: dense, fibrous, woody weeds. This is the diameter that actually shears a tough stem, and the EGO ST1502SA and ST1623T run it. It also uses more battery, which is the fair complaint against thicker line.
Shape matters less than people think. Round line is cheapest and lasts longest; square and twisted shapes cut sharper edges but chip more quickly. Buy a two-pack of 0.080 inch to try before committing to thick line on every spool.
Line Loading: Bump Feed vs Button Feed vs Auto Feed
This is the most repeated complaint in every yard forum we read, and it decides a purchase more often than power does. There are three mechanisms.
Bump feed: tap the head on the ground to advance line. Cheapest, most common, and the easiest to break or jam. The EGO ST1502SA and RYOBI here use this.
Button or push-button feed: press a control to feed line. Simple and reliable, though you stop working to do it. The WORX WG163 and CRAFTSMAN CMEST913 use this.
Automatic feed: the head meters line without any input. The BLACK+DECKER LST300, LST136, CRAFTSMAN V20 and WORX WG183 all do this. The premium design is POWERLOAD and LINE IQ, where line winds on in seconds and the head holds a fixed swath automatically.
If you have never restrung a trimmer before, buy into the automatic or POWERLOAD category. Learning the technique is fine; relearning it every time a spool tangles is not.
Swath Width, Weight and the Job You Are Signing Up For
Cutting swath is the diameter of lawn cleared in one pass, and it is the easiest multiplier of productivity. Moving from a 12 inch head to a 16 inch head cuts the number of passes on an open yard by roughly a quarter. For detail work around shrubs the narrow head is actually easier to control, and a wide head is a liability in tight corners.
Weight is the number buyers most often under-weight before buying and most regret afterwards. Listed weight is bare weight, and the pack changes the feel more than the spec sheet suggests. Anyone with an existing back or shoulder problem should treat a shoulder strap as required equipment, not an accessory.
Before you commit, check the ergonomics against your household. Telescoping shafts help shorter users and hurt if left extended. An oversized upper handle is a real problem for smaller hands. For the hedge work that follows on from a long weedy summer, our hedge trimmer picks for tall hedges cover the right tool, and for reaching above your head our pole hedge trimmer guide goes deeper.
Finally, wear eye and hearing protection, keep the debris guard in place, and remember that line is thrown debris in motion. The guard is there for a reason, and trimming a fence line is exactly when people take it off.
Frequently Asked Questions: String Trimmers for Thick, Heavy and Overgrown Weeds
What string trimmer is best for thick weeds?
For thick, fibrous weeds the EGO POWER+ ST1502SA is the best fit in this roundup, because it runs 0.095 inch professional-grade line on a 56V brushless motor. Line diameter is the deciding factor: thinner stock line deflects off tough stems instead of cutting them. If your weeds are tall but not woody, the BLACK+DECKER LST136 40V at 8500 rpm is a lighter alternative.
What line size should I use for heavy weeds?
Use 0.095 inch line for dense, fibrous and woody weeds. Use 0.080 inch as an all-round upgrade for general yard work and taller grass, and 0.065 inch only for light growth and lawn edging. Thicker line cuts better but uses more battery, so match the diameter to the job rather than running the heaviest line in every spool.
What is the best tool to cut through thick weeds?
For knee-high fibrous weeds, a 40V or 56V brushless string trimmer running 0.095 inch line is the right tool. For woody stems and saplings, no string trimmer is adequate, and you need a brush cutter with a metal blade, either as a dedicated tool or as an attachment on a multi-tool platform. A string trimmer works by shearing stems, not by tearing woody growth.
Will a string trimmer kill weeds permanently?
No. A string trimmer cuts the top growth off, it does not remove the root system. On annual weeds, repeated cutting before they flower and set seed genuinely controls them. On perennial weeds with root systems, the plant regrows from the root and often regrows thicker. Cut young growth low and on a regular schedule, and expect control rather than elimination.
How much power do I need for thick weeds?
For light grass and ordinary weeds, 20V cordless is enough. For tall dense weeds you want at least 40V with a brushless motor, or a corded motor of 5 amps and above. For growth that is woody or over half an inch thick, no amount of trimmer power helps and a brush cutter is the correct tool. Match line diameter to power rather than relying on either alone.
What string trimmer line should I buy for heavy weeds?
Buy a two-pack of 0.095 inch dual-color line for heavy weeds, and check the head is rated for that diameter before fitting it. Round line lasts longest and is cheapest, while square and twisted shapes cut sharper but chip sooner. Loading a heavier line is easier if the head has automatic or push-button feed, and the EGO ST1502SA and ST1623T are the two models here rated for 0.095 inch from the factory.
Which String Trimmer for Weeds Should You Buy in 2026?
If you have one decision to make, pick the tool that matches the worst growth in your yard rather than the average. The WORX WG163 is the right answer for most people because it is the least tiring, reloads with one button and ships with two batteries. If your weeds are tall and fibrous, go straight to the EGO ST1502SA and its 0.095 inch line, and accept the bump feed head as the cost.
Pick the EGO ST1623T if manual line loading has kept you from owning a trimmer before, the BLACK+DECKER LST136 40V if you want one dial for hard work and one for easy work, the BLACK+DECKER ST8600 if you have an outlet and want constant force, and the DEWALT 60V if you want the widest pass over open ground. For a multi-tool shed, the RYOBI 40V converts to other attachments, with a shoulder strap treated as mandatory at 13.9 lb.
Whatever you choose, buy 0.080 inch line as a first upgrade and keep it in mind that no string trimmer kills a perennial weed at the root. Use the buttons above to check the latest details for the model that fits your weed problem, and expect this list to be updated as new models land through the year.
