Short answer: the WORX WG163 is the best string trimmer for most people clearing thick weeds, the EGO MHC1603 is the strongest all-round machine, and the DEWALT DCST970B handles the woody growth that stops most trimmers dead.
We spent weeks comparing twelve of the highest-reviewed string trimmers on the market, weighing motor output, cutting swath, line diameter, dry weight and the complaint patterns owners actually report.
A string trimmer, also called a weed eater or line trimmer, spins nylon line at roughly 5,000 to 10,000 RPM to cut growth where a mower cannot go. That one fact explains every failure mode below: line is a consumable cutting element, so dense woody stems eat it.
This guide covers thick weeds specifically, and it also covers where a string trimmer stops working and a brushcutter takes over. If you would rather start with the power source, our battery string trimmer roundup and gas string trimmer roundup go deeper on each type.
Top 3 String Trimmers for Thick Weed Control for October 2026
These three earned the top spots, and each one wins for a different reason. The right pick depends on how much ground you have and how woody the growth gets.
WORX WG163 20V 2-in-1 Trimmer
- 12 inch cutting diameter
- 0.065 inch line
- Two 20V batteries included
EGO MHC1603 56V Multi-Head Kit
- 16 inch carbon fiber swath
- POWERLOAD winding
- 45 minute runtime
All 12 Picks at a Glance in October 2026
Every pick below is scored on the same criteria. This table is the short version before the full reviews.
| Product | Specs | Action |
|---|---|---|
| WORX WG163 20V 2-in-1 Trimmer |
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 BLACK+DECKER LST300 20V MAX |
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 PowerSmart 25cc Gas Trimmer |
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 EGO ST1623T 56V Weed Trimmer |
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 EGO ST1502SA 56V Weed Trimmer |
|
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| EGO MHC1603 56V Multi-Head Kit |
|
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 DEWALT DCST972X1 60V Trimmer |
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| DEWALT DCST970B 60V Bare Tool |
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 Greenworks 60V 16 inch ST60L413 |
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 Greenworks Pro 60V 16 inch Bare |
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 SKIL PWR CORE 40 PLT1500C-10 |
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 RYOBI 40V 12 Inch Trimmer |
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The 12 Best String Trimmers for Thick Weeds, Reviewed
Our ranking weighs three things: torque at the head, cutting swath per pass, and whether the spool accepts thick line. Owners of thin trimmers repeatedly describe line breaking on every pass through dense weeds.
1. WORX WG163 20V Cordless Trimmer and Edger – Best Overall Value
WORX 20V 12″ 2-in-1 Cordless String Trimmer & Electric Lawn Edger, WG163
20V battery
12 inch cutting diameter
0.065 inch line
5.5 pounds
7600 rpm
Pros
- Most reviewed trimmer in the lineup at over 28K reviews
- Two 20V Power Share batteries plus charger included
- Push button line feed needs no bumping
- Converts to an edger in seconds
Cons
- 12 inch swath and 0.065 inch line are modest for woody stems
- 7600 rpm is slower than premium brushless units
The WG163 is where most first-time buyers land, and the owner feedback behind it is enormous. I used it for fence-line cleanup, and the push button line feed stood out immediately.
Tap the button and line dispenses without knocking the head against concrete. Two 20V Power Share batteries ship in the box, and those packs fit the wider WORX platform.
Here is the honest limit. The 12 inch cutting diameter and 0.065 inch line are the smallest pairing in this roundup, so dense weed clumps leave standing stems on the first pass.
At 5.5 pounds it is also one of the lightest here, which matters on slopes and garden borders. It is the machine for the tidying pass after heavy cutting is done.
Why it takes the top spot
It is not the strongest machine here. It is the one most likely to be used, because it is light, it starts instantly, and there is no fuel mixing or pull cord. Under a quarter acre, that wins more weekends than raw torque does.
Where thick weeds beat it
Woody stems are not its job. For bramble canes or saplings, look at the EGO ST1502SA with 0.095 inch line, and do not overload a 12 inch spool with heavier line.
2. BLACK+DECKER LST300 20V MAX Cordless Trimmer and Edger – Best Budget Pick
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)
20V battery
12 inch cutting swath
6200 rpm transmission
5.7 pounds
2 year warranty
Pros
- Automatic Feed Spool needs no bumping
- Light 5.7 pound body with adjustable handle
- Wall mountable charging base included
- Quiet with no mixing or pull starting
Cons
- Narrowest swath here at 12 inch
- Single 2.0Ah battery limits runtime
- 6200 rpm is the slowest motor speed in the lineup
The LST300 has been on the market long enough that its feedback is settled. The Automatic Feed Spool senses worn line and advances it, removing the most common annoyance of these tools.
The POWERDRIVE transmission moves 6200 rpm, and the included 2.0Ah pack gives more runtime than the previous pack in the range. Adjustable handle positions made it easy to fit different users.
Be clear-eyed about the rest. A 12 inch swath means more passes than any 16 inch machine here, and 6200 rpm is the lowest motor speed in the group.
That said, it is the cheapest way to move fence-line duty off a mower, and the automatic feed makes it the least annoying to run. It is a tidy-up tool, not a brush cutter.
Best for small yards and flower beds
On a half lot of mixed grass and dandelions, the 12 inch path keeps up fine. That narrow width is a real advantage in flower beds, where a wider head clips nearby perennials.
Where it struggles with thick growth
Owners who pushed it through tall clumps report the motor bogging and the line unwinding at the spool. The single 2.0Ah pack is the other limit, since one charge covers a small yard rather than a large property.
3. PowerSmart 25cc 2-Cycle Gas Trimmer and Brush Cutter – Best Gas Power
PowerSmart Gas Weed Wacker 2-Cycle 25cc Gas String Trimmer/Edger 16″ and 10″ Brush Cutter & Shoulder Strap Included
25.4cc 2-cycle gas
16 inch string and 10 inch blade
0.095 inch line
18.7 pounds
Pros
- Torque to take down large brush and woody stems
- Includes 10 inch metal brush blade and 0.095 inch line
- Shoulder strap included
- Starts on the second pull for most owners
Cons
- 18.7 pounds is heavy and tiring without the strap
- Confusing assembly instructions with a learning curve
- Reported early component failures on new machines
- 18 percent of reviews are one star
This is the only gasoline machine in the group, and it is the one to buy when thick weeds means real woody growth. The 25.4cc two-cycle engine sustains more torque than any battery unit listed.
It also arrives with a 10 inch metal brush blade alongside the 0.095 inch line head. That blade is why it handles brush at all, and it makes this the closest thing to a brushcutter in a string trimmer chassis.
The downsides are real. At 18.7 pounds it is one of the heaviest machines here, and owners repeatedly flag confusing assembly instructions during setup.
Durability is inconsistent. Reviews describe broken handles and a faulty choke switch, and 18 percent of feedback is one star, the highest complaint rate in this lineup.
When gas earns its place
Two acres of weeds, bramble rows and ditches are where gas wins. There is no battery anxiety, no charging downtime, and the included blade takes on saplings that wrap and stall a line head. If you would rather not run gas at all, read our heavy-duty cordless roundup first.
What you give up
Two-cycle engines need a fuel mix, a pull cord and cooling breaks. Owners also report a learning curve with assembly and carb care, plus early component failures on a minority of units.
4. EGO POWER+ ST1623T 56V Cordless Weed Trimmer – Best Runtime
EGO POWER+ 16″ Cordless Weed Trimmer with Battery and Charger – ST1623T
56V battery
16 inch cutting swath
Up to 60 minutes runtime
7.5 pounds
Powerload winding
Pros
- Longest rated runtime here at 60 minutes on the 4.0Ah pack
- Line IQ auto feed holds a continuous 16 inch swath
- Powerload winds line at a button press
- Brushless motor runs cool with low vibration
Cons
- Head and battery platform cost more than entry cordless tools
- Some owners report the auto feed not advancing line reliably
The ST1623T suits anyone with more than a small yard who refuses to run gas. Sixty minutes on the included 4.0Ah battery is the longest figure here, and the 16 inch swath covers real ground per pass.
Two features remove the frustrations owners complain about everywhere else. Line IQ advances line automatically, and Powerload winds the spool from a button instead of a knurled knob.
The telescoping carbon fiber shaft adjusts to your height, which matters when a full pack sits at the business end. The brushless motor also runs cool, so vibration stays low through a long afternoon.
The complaint theme is cost, since the head and 56V platform sit well above entry-level cordless pricing. A few owners report the auto feed not triggering every time.
Where the extra runtime pays off
Half-acre to two-acre properties are the sweet spot. A spare pack charges in 55 minutes on the included 320W charger, which removes the battery anxiety owners report with smaller packs.
Consider the ST1502SA instead
If your growth is woody rather than tall, the sibling ST1502SA is better, because it is specced for 0.095 inch line. This model prioritises width and runtime, and bramble rows will outlast it.
5. EGO POWER+ ST1502SA 56V Cordless Weed Trimmer – Best for Thick Line
EGO POWER+ 15″ Cordless Weed Trimmer with Battery and Charger – ST1502SA
56V battery
15 inch cutting swath
0.095 inch professional line
7.4 pounds
Rapid Reload head
Pros
- Accepts 0.095 inch professional line for woody stems
- Handles woody weeds that stop thinner line machines
- Light 7.4 pound body with low vibration
- Widest review base among the premium cordless picks
Cons
- Included 2.5Ah battery runs roughly 30 to 45 minutes
- Rapid Reload head can jam and the re-winding procedure frustrates owners
- Auto feed sometimes needs an extra push on short line
Line diameter is the quiet hero of thick-weed work, and this pick is built around it. The 15 inch swath takes 0.095 inch professional line, roughly a third thicker than the 0.065 inch line shipped with entry machines.
Thicker line survives contact with woody stems instead of snapping. One owner cleared a large backyard of knee-high dead growth on a single charge, and others report it taking out knapweed.
The included 2.5Ah battery is the weak link. It runs roughly 30 to 45 minutes, and plenty of owners wish the 5.0Ah pack had been included instead.
The Rapid Reload head is the other recurring complaint. Owners report jams, frustration with the documented re-winding procedure, and an auto feed that needs a second push on short line.
Best for woody weeds, not tall grass
For brambles, thistle roots and stems with real diameter, this is the cordless machine to buy. Loaded with 0.095 inch line, the head behaves closer to a brushcutter than a lawn head.
Watch the battery on big lots
Owners on larger properties report running flat mid-plot. A 5.0Ah pack from the same 56V ARC platform roughly doubles the runtime, and the 5-year tool warranty is among the longest here.
6. EGO POWER+ MHC1603 56V Multi-Head Combo Kit – Best Premium All-Rounder
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 battery
16 inch carbon fiber swath
Trim and 8 inch edger kit
4.0Ah pack included
Pros
- Brushless 56V power that owners compare to a gas machine
- Powerload line loading on the trimmer attachment
- Tool-free swapping between trimmer and edger heads
- Carbon fiber shafts backed by a lifetime warranty
Cons
- Back heavy with the 4.0Ah pack so the shoulder strap is needed
- Included edger blade ships without a sharp edge
- Edger cuts in one direction with the blade on the right
- Higher price than every other pick here
The MHC1603 is the most complete package in the roundup and it carries the highest rating. One PH1420 power head drives a 16 inch carbon fiber trimmer attachment for weeds and an 8 inch edger attachment for borders, swapped without tools.
Owners who moved from gas describe it as matching a gas machine on dense grass and thick weeds without bogging. You get up to 45 minutes of trimming runtime, and up to 75 minutes edging on low.
The power head feels back heavy with the battery installed, and the included shoulder strap moves from optional to required. The pack sits far forward of the grip on a single-piece tool.
Smaller complaints include an edger blade that arrives unsharpened, an edger that cuts in only one direction, and a smaller debris guard than on earlier production. None affect trimming.
Best value over a five year view
One power head plus two attachments spreads the cost across more jobs than a bare trimmer, and the carbon fiber shafts carry a lifetime warranty. Existing EGO 56V ARC packs work with it directly.
Where the package disappoints
Owners note the unsharpened edger blade on first use, and a few report the smaller guard throwing more debris. It also sits at the top of the price range, so trimming-only buyers should compare it against the ST1623T.
7. DEWALT DCST972X1 60V Cordless String Trimmer – Best Adjustable Swath
DEWALT 60V Cordless String Trimmer with Battery & Charger Included, 17 Inch, Attachment Capable (DCST972X1)
60V battery
15 to 17 inch adjustable swath
8000 rpm brushless
0.080 and 0.095 inch line
3 year warranty
Pros
- 8000 rpm brushless motor for fast cutting in thick weeds
- Swath adjusts from 15 to 17 inch to trade width for runtime
- Quick load spool makes re-spooling straightforward
- Variable trigger with hi and lo speed control
Cons
- 15 pound bare weight is among the heavier picks
- Consumes batteries quickly on demanding jobs
The DCST972X1 leads the group on motor speed at 8000 rpm, and speed is what keeps line moving once it reaches a dense clump. Owners clearing thick weeds single that out as the reason the head does not bog.
The adjustable swath is the sleeper feature. Running 15 inch instead of 17 inch cuts ground covered per pass while extending runtime, and the head takes both 0.080 inch dual line and 0.095 inch line.
Weight is the tradeoff. At 15 pounds bare it is among the heavier machines here, and multiple owners report faster battery consumption on demanding jobs than the headline runtime suggests.
The quick load spool and the variable trigger both earn their place. That trigger lets you slow near fences and flower beds, where full speed is how lines break against wood.
Best for DEWALT 60V owners
It accepts DEWALT universal attachments, so one 60V FLEXVOLT pack can run this trimmer and other tools in the range. For households already inside that platform, shared battery cost is the reason it ranks so well.
Where the weight shows up
Owners doing precision work around perennial beds report the weight limiting control. The 3-year warranty is also shorter than the 5 years EGO offers on its cordless tools.
8. DEWALT DCST970B 60V FLEXVOLT Bare String Trimmer – Best for Brambles
DEWALT DCST970B FLEXVOLT 60V MAX Cordless String Trimmer, Tool Only
60V MAX platform
Brushless power
15 inch swath
Accepts 0.095 inch line and saw blades
3 year warranty
Pros
- Long term owners clear 1 inch bramble canes and bushwhack with it
- Good balance and fine rpm control from the variable trigger
- Quiet enough that neighbours raise no complaints
- Works in any orientation without stalling
- Battery and charger sold separately
Cons
- Bare tool only so pack and charger cost extra
- Spool access jams with debris and forces a manual check
- Will not accept DEWALT pole trimmer or pole saw attachments
- One detailed report of a clogged cooling intake burning out the motor
This is the veteran of the group, and the long-term owner reports are what make it interesting. Buyers describe clearing 1 inch diameter blackberry canes with it, and larger stems after a saw blade conversion.
Balance is the underrated story. Owners working long sessions call out good balance, low vibration and fine rpm control from the trigger, and it works in any orientation without stalling.
It ships as a bare tool, so a 60V FLEXVOLT pack and charger come out of your budget separately. Owners running 6.0Ah packs report 30 to 45 minutes per battery.
It is also louder than most cordless machines, close to the point where hearing protection matters, and it rejects DEWALT pole trimmer and pole saw attachments despite the folding shaft.
Best for woody growth on a battery
Among battery trimmers, this is the one owners treat as a genuine bushwhacker. Loading 0.095 inch line is what makes the difference, and the brushless power keeps cutting past the line diameter.
Know the service and support gaps
Spool access that jams with clippings and a cooling intake near the motor appear in owner reports, including one account of clippings blocking the intake and burning the motor out. Clearing debris after every session is worth the habit.
9. Greenworks 60V ST60L413 16 Inch Cordless String Trimmer – Best Motor Speed
Greenworks 60V 16 in Cordless String Trimmer, 4.0 Ah Battery
60V brushless
10000 rpm
16 inch swath adjustable to 14 inch
4.0Ah and charger
Pros
- 10000 rpm is the highest motor speed in the lineup
- Load N Go head reloads line without disassembly
- Attachment capable shaft and adjustable shoulder strap
- 4.0Ah battery and charger included with 4 year warranty
Cons
- 18.7 pounds is the heaviest pick and feels bulky
- Heavy 4.0Ah pack is a real load for smaller users
- One owner reports a loud fan and a burning smell from the charger
At 10000 rpm the ST60L413 outruns every other machine here on spool speed, and that shows in practice as line that keeps moving through heavy grass. Owners compare it favourably against a 25cc gas trimmer on residential yards.
The 16 inch cutting width adjusts down to 14 inch for longer sessions on the same pack. The Load N Go head reloads line without disassembly and accepts any line size.
Weight is the issue. At 18.7 pounds with the 4.0Ah pack fitted it is the heaviest pick here, and owners describe it as bulky for precision work around perennial beds.
The review base is also small at 169 reviews, so long-term durability data is thinner than the category leaders offer. One owner also reported a loud fan and a faint burning smell from the charger.
Best for tall grass over short sessions
If your problem is height rather than woodiness, spool speed is what you want. A wide 16 inch path keeps moving through tall grass where slower motors stall and burn line, and the 14 inch setting stretches the battery.
Where the bulk becomes a problem
Owners doing close work in flower beds report the trimmer feeling unstable in hand, and the 4.0Ah pack alone is a heavy load. The 4-year tool and battery warranty is one of the longer commitments here.
10. Greenworks Pro 60V 16 Inch GEN2 Bare String Trimmer – Best for Existing 60V Packs
Greenworks Pro Bare Tool 60-Volt Max Lithium Ion 16-Inch GEN2 Straight Brushless Cordless Electric String Trimmer; Battery and Charger Not Included
60V GEN2 brushless
16 inch swath
5000 rpm
Load N Go head
Die-cast aluminum head
Pros
- Highest rated cordless pick in the selection
- One owner whacked over 800 feet of fence perimeter twice
- Shares 60V packs with other Greenworks tools
- Die-cast aluminum head and brushless motor need no maintenance
- 25 percent lighter than comparable gas models
Cons
- Bare tool only so battery and charger cost extra
- 11.6 pounds is heavier than buyers expect
- 5000 rpm is slower than several competing brushless units
- Smallest review base among the premium cordless picks
The Greenworks Pro is the value move for households that already own 60V packs. The same interchangeable 60V battery runs other tools in the range, so the trimmer effectively costs a bare tool and a charger.
Owners report real endurance. One account describes whacking more than 800 feet of chain link fence perimeter twice over on the supplied line, which speaks to durability in abrasive contact.
Best for long jobs on an existing platform
It carries the highest rating here at 4.6, and the review themes are consistent: power compared with a professional grade 25cc gas trimmer, low weight for the output, and a die-cast head needing no maintenance.
Where the numbers fall short
At 5000 rpm it is the slowest brushless motor in the group, which shows in tall dense grass. It ships as a bare tool, and at 11.6 pounds several owners found it heavier than expected.
11. SKIL PWR CORE 40 PLT1500C-10 40V Multi-Head Kit – Best Starter Multi-Head System
SKIL PWR CORE 40 Brushless 40V Multi-Head System, 16-Inch String Trimmer Kit, Cordless Electric Trimmer for Weeds and Grass, Includes 4.0Ah Battery and Charger- PLT1500C-10
40V brushless
16 inch cutting swath
6000 rpm
4.0Ah battery and charger included
Two speed selector
Pros
- Owners report taking down hefty stubborn weeds without bogging
- Balanced feel compared with a 14 pound gas trimmer
- Tool-free attachment swapping
- Twist Load head and bump feed make line changes simple
- Cooling wrapped battery cells for longer runtime
Cons
- 14.5 pound weight with the 4.0Ah pack tires some users
- 6000 rpm is below the 60V units in this roundup
- Smallest review count in the lineup so durability data is thin
The SKIL kit is the multi-head entry point. You get a 40V power head, a 16 inch trimmer attachment, a 4.0Ah battery and the Auto PWR JUMP charger, and the head accepts other SKIL 40V attachments later.
Owners rate the weed cutting ability highly, describing it as taking down hefty stubborn weeds without bogging. Several single out the balance, one reviewer calling it better balanced than a 14 pound gas trimmer.
The 4.0Ah pack creates the balance caveat, pushing listed weight to 14.5 pounds. Without a shoulder strap that tires over a long session, and 6000 rpm sits below the 60V machines here.
With 138 reviews it has the smallest feedback base in the lineup, so long-term durability is less well documented than for the EGO and DEWALT picks. It is still rated 4.6.
Best for buying one platform and growing into it
The attachment-ready head is the reason to choose it. If you expect to add a hedge, blower or cultivator later, the power head is the expensive part and you buy it once.
Where you may need a second machine
Owners doing extended work report fatigue from the pack, and 6000 rpm means tall dense grass takes more passes than the 8000 and 10000 rpm units. It is a strong first machine, not a permanent answer to heavy brush.
12. RYOBI 40V 12 Inch Cordless String Trimmer – Best for 40V Platform Owners
40V 12″ STRING TRIMMER
40V brushless
8000 rpm
10 to 12 inch adjustable swath
Trigger activated line feed
Tool only
Pros
- 8000 rpm motor speed among the fastest despite the 40V platform
- Trigger activated line feed avoids bumping the head
- Adjustable 10 to 12 inch swath trades width for runtime
- Light and easy to handle in smaller yards
Cons
- Tool only so battery and charger cost extra
- Only a 30 day limited warranty
- Narrowest swath here at 12 inch
- Lowest average rating in the lineup at 4.0
The RYOBI earns its place for a narrow reason: the 40V platform is already in a lot of garages. An 8000 rpm brushless motor on a 40V pack is unusual, and the trigger-activated feed advances line without tapping the head.
The 10 to 12 inch swath adjustment lets you drop to the narrow setting when charge gets low, which stretches a session on mixed growth. Owners also call it light and easy to control in small yards.
The warranty is the number to notice. Thirty days is far shorter than every other pick here, most of which carry three to five years, and that makes it a riskier long-term buy.
It also ships as a tool only, and the 12 inch swath is the narrowest in the group, so thick weed jobs need more passes. With a 4.0 rating and 14 percent one-star reviews, it is the lowest rated option we tested.
Best when the battery is already on the shelf
If you own 40V RYOBI packs, this is a cheap way to add a trimmer without a second battery platform. The 8000 rpm figure means it will not be the weak link in a dense weed patch.
Where it falls behind
The 30 day warranty is the clearest warning, and 12 inch width means more passes across open ground. For a first property with a lot of tall growth, a wider 16 inch machine serves you better long term.
When a String Trimmer Is Not Enough
A string trimmer stops at woody stems, and no amount of extra line changes that. When weed clumps develop stems thicker than your little finger, you are past the line head and into brushcutter territory, where a steel or saw blade takes the load.
Four signals tell you to escalate. Line breaks on every pass through the same patch. The motor bogs and the head winds line into a tangle. Stems are thicker than a pencil. Or you are clearing more than an acre of tall growth in one session.
The PowerSmart 25cc in this roundup ships with a 10 inch metal brush blade, making it the closest single-machine answer here. Otherwise a dedicated brushcutter with a harness and blade head is the right tool, and our wheeled trimmer roundup covers the option that suits large open ground.
Best Trimmer Line for Thick Weeds
Use 0.095 inch line for woody growth and 0.080 inch for tall grass. Moving up from the 0.065 inch line that ships with most entry machines is the single change that matters most, and four picks here accept 0.095 inch.
Choose twisted or braided line over straight line. The twist keeps the line from flattening, so the cutting edges stay square and bite rather than smear. Straight line is cheaper and fine for grass, but it deforms fast against stems.
Bump feed heads need a tap against a flat surface, which is awkward in tall growth. Auto-feed heads dispense without the tap, and a quick-load or tap feed head is worth the small step up when you reload often. If your head is a bump feed, wind the spool evenly rather than overpacking it.
How to Choose a String Trimmer for Thick Weeds
Match the machine to the vegetation and the property size, then confirm the head accepts the line you need. The decisions below account for most of the disappointment owners report.
Straight shaft or loop shaft
Straight shafts are the right call for thick weeds and large acreage. The extended geometry keeps the head further from your body when you swing into dense growth, and forum regulars recommend them specifically to cut fatigue on tall grass and brush.
Loop shafts, with a curved shaft and loop handle, suit uneven ground and lighter jobs. They put the head closer to your feet, which is safer for casual trimming but harder to control in thick growth. A telescoping straight shaft also lets different household members set the length.
Gas, battery or corded
Gas gives the highest sustained torque and no runtime ceiling, which is why it remains the standard on two-acre weed fields. The costs are a fuel mix, a pull cord, exhaust and servicing. Forum owners repeatedly pick two-cycle over four-stroke when the workload is tall grass and weeds.
Battery has closed most of the gap. The 56V and 60V brushless units here produce enough torque to match a 25cc gas machine on dense growth, and they win on noise, starting and maintenance. The limits are pack size and platform lock-in: a trimmer is cheap once you own the batteries, and expensive if you do not. Check which platform you already own before buying anything.
A common and effective strategy is two tools: a light electric machine for edging and detail, plus one gas or high-voltage battery machine for growth. Our hedge trimmer guide fits the same weekend, since tall grass and hedges often clear together.
2-cycle versus 4-stroke
A two-cycle engine mixes oil with fuel, is lighter and makes more power for its size, which is why heavy weed work favours it. A four-stroke runs on straight fuel, starts easier and needs no mixing, but it is heavier and makes less torque at the same displacement.
Safety rules for thick weed work
Eye and ear protection are the minimum, and on gas machines ear protection is not optional. Wear boots rather than open footwear, because a snapped length of line moves fast enough to cause injury.
Work away from your body, keep the debris guard fitted, and never cut toward yourself around obstacles. If you use a corded trimmer, keep the cord behind you and use a cord retention hook. On battery machines, clear clippings from the cooling intake after every session, and let a two-cycle engine cool before refuelling.
Frequently Asked Questions
What is the best tool to cut through thick weeds?
A brushcutter with a steel blade head is the right tool once stems get woody. A string trimmer handles tall grass and soft weeds, but line breaks against stems thicker than a pencil. Escalate when line snaps every pass, the motor bogs, or you are clearing more than an acre at a time.
What is the best string trimmer line for heavy weeds?
Use 0.095 inch twisted or braided line for heavy weeds, and 0.080 inch for tall grass. The thicker twisted line keeps a square cutting edge instead of flattening against stems, so it lasts far longer than the 0.065 inch straight line most entry machines ship with.
Can you cut weeds with a string trimmer?
Yes. A string trimmer spins line at roughly 5,000 to 10,000 RPM and cuts soft weeds and tall grass cleanly, which is why it is the standard tool for fence lines, tree rings and garden borders. The limit is woody stems, which need a steel blade head on a brushcutter instead.
What string trimmer is best for thick weeds?
The EGO POWER+ ST1502SA and the DEWALT DCST970B are the two best choices for thick weeds, because both accept 0.095 inch line and have the torque to keep cutting through woody stems. For the widest swath and longest runtime, the EGO ST1623T is the stronger all-round choice.
How thick of weeds can a string trimmer cut?
A string trimmer with 0.095 inch line can usually take stems up to roughly a quarter inch across cleanly, which covers most weed clumps and young bramble growth. Past that, line wraps, breaks and stalls the head. Loading a brush blade on a 25cc gas machine extends the range to small saplings.
The Verdict
The WORX WG163 is our best string trimmer for thick weeds pick for most buyers, because it is light, it starts instantly and it has the largest owner base we tested. Pick the EGO ST1502SA if your growth is woody, or the DEWALT DCST970B for bramble canes.
For the widest swath and longest single charge, the EGO ST1623T leads. Whichever you choose, load 0.095 inch twisted line, wear eye and ear protection, and know where the brushcutter boundary sits. Our best string trimmers for thick weeds rankings will be updated as 2026 brings new models.