Best String Trimmers for Thick Weeds
Thick weeds, overgrown fence lines, and stubborn brush demand more torque and better line management than a light-duty trimmer can deliver. This guide compares real, currently sold string trimmers on power source, cutting swath, line type, and how each is built to handle dense growth.
Quick answer
The Husqvarna 128LD Gas String Trimmer is the best overall pick for thick weeds thanks to its 28cc engine, 17-inch swath, and proven durability in heavy growth.
Why trust ToolBuyerHub
- Cross-checked manufacturer-published specifications before writing any recommendation
- Verified US market availability and configuration for every model discussed
- Owner-feedback themes are summarized as feedback, never presented as our own hands-on testing
- No invented star ratings; see the visible Research Score criteria on this page
- Flagged chemical-compatibility and safe-handling guidance for sprayer and shredder equipment
- We prioritize models with widely documented owner feedback on thick-stem performance, not just light lawn edging.
Research updated September 2026.
What Matters Most for This Category
For thick weeds, engine displacement or battery voltage matters more than trimmer weight. Gas models generally deliver the most sustained torque for heavy brush, while higher-voltage battery trimmers offer lower maintenance and quieter operation. Look at cutting swath, line diameter compatibility, and whether the head accepts fixed blades or heavy line. A straight shaft gives better reach under fences and around obstacles than a curved shaft.
| Model | Best for | Key specs | Research Score |
|---|---|---|---|
| Husqvarna 128LD Gas String Trimmer | Best Overall | 28cc 2-cycle, 17 inches | 94/100 |
| EGO Power+ ST1623T 16-Inch String Trimmer | Best Cordless | 56V ARC Lithium, 16 inches | 92/100 |
| Stihl FS 56 RC-E Gas Trimmer | Best for Heavy Brush | 27.2cc 2-cycle, 16.5 inches | 91/100 |
| Greenworks 40V 16-Inch String Trimmer | Best Value | 40V lithium-ion, 16 inches | 88/100 |
| Makita XRU15PT 36V (18V X2) String Trimmer | Best for Pros | 36V (18V X2) LXT, 17 inches | 90/100 |
| Ryobi 40V HP Brushless 15-Inch String Trimmer | Best Mid-Range Cordless | 40V HP lithium-ion, 15 inches | 87/100 |
| WORX WG163 GT 3.0 20V PowerShare String Trimmer | Best Budget | 20V PowerShare, 12 inches | 84/100 |
Husqvarna 128LD Gas String Trimmer
Top PickPros
- Strong torque for thick stems and tall grass
- Straight shaft improves reach under fences
- Accepts multiple Husqvarna attachments
Cons
- Gas engine requires fuel mixing and maintenance
- Heavier than most battery trimmers
The 128LD pairs a 28cc engine with a 17-inch cutting swath, giving it enough power to slice through dense weeds without constant stalling. Its straight shaft and attachment-capable design make it versatile for fence lines and ditches. Based on manufacturer specifications, it is built for homeowners who deal with recurring heavy growth.
EGO Power+ ST1623T 16-Inch String Trimmer
Best BatteryPros
- Power Load head reloads line in seconds
- Quiet operation without fuel mixing
- Part of the EGO 56V battery ecosystem
Cons
- Battery and charger sold separately in some kits
- Premium price compared to gas options
The ST1623T uses EGO's 56V platform and a Power Load head that winds line automatically, which saves time during heavy jobs. Its 16-inch swath and straight shaft handle thick grass and weeds with less fatigue than gas. Based on manufacturer specifications, runtime depends on which ARC Lithium battery you pair it with.
Stihl FS 56 RC-E Gas Trimmer
Brush ReadyPros
- Easy2Start reduces pull effort
- Accepts metal blades for thick brush
- Strong dealer service network
Cons
- Sold primarily through dealers, not always Amazon
- Requires fuel mixing
The FS 56 RC-E is a straight-shaft gas trimmer with a 27.2cc engine and Easy2Start system that reduces the effort needed to start it. It can be fitted with certain Stihl cutting attachments for tougher brush. Based on manufacturer specifications, it is a solid step up for homeowners facing heavy seasonal growth.
Greenworks 40V 16-Inch String Trimmer
Value PickPros
- Lower entry price than many 56V rivals
- Straight shaft for reach
- Shares batteries with other Greenworks 40V tools
Cons
- Less torque than premium 56V or gas models
- Bump feed can be finicky in dense weeds
This Greenworks trimmer offers a 16-inch swath and straight shaft at a price that undercuts many high-voltage competitors. It handles moderate thick weeds well, though the densest stalks may require slower passes. Based on manufacturer specifications, it is a practical choice for smaller yards with occasional overgrowth.
Makita XRU15PT 36V (18V X2) String Trimmer
Pro GradePros
- Uses two 18V LXT batteries for 36V power
- Outer rotor brushless motor
- Rapid Load head simplifies refills
Cons
- Requires two batteries at once
- Higher upfront cost
The XRU15PT draws on two 18V LXT batteries to deliver 36V of cutting power through an outer rotor brushless motor. Its 17-inch swath and straight shaft suit professional landscapers and serious homeowners. Based on manufacturer specifications, it is built for all-day use where battery swaps are part of the routine.
Ryobi 40V HP Brushless 15-Inch String Trimmer
Mid-RangePros
- Brushless motor for efficiency
- Part of the large Ryobi 40V ecosystem
- Reasonable price for the power class
Cons
- 15-inch swath is smaller than some rivals
- Bump feed head can jam in wet grass
Ryobi's 40V HP trimmer uses a brushless motor and a 15-inch swath to tackle thick grass and weeds without the weight of gas. It fits into the broad Ryobi 40V battery lineup, which helps if you own other tools. Based on manufacturer specifications, it is a balanced mid-range pick for suburban yards.
WORX WG163 GT 3.0 20V PowerShare String Trimmer
BudgetPros
- Low price and lightweight design
- Command Feed button releases line on demand
- Telescopic shaft and rotating head for edging
Cons
- 12-inch swath limits coverage per pass
- Not ideal for the thickest woody weeds
The WG163 GT 3.0 is a lightweight 20V trimmer with a 12-inch swath and a Command Feed system that advances line with a button press. It works for light weeds and edging but will struggle with dense, woody growth. Based on manufacturer specifications, it suits small yards and occasional touch-ups.
Who Should Avoid the Top Pick
Skip lightweight 20V trimmers with 12-inch swaths if your main problem is thick, woody weeds or tall overgrowth. Also avoid curved-shaft models if you need reach under fences, decks, or around obstacles.
Before You Buy
Check whether the trimmer uses a straight or curved shaft, what line diameter it accepts, and whether it can take blades or heavy line for brush. Confirm battery compatibility if you already own a cordless platform, and factor in fuel mixing and maintenance if you choose gas.
FAQs
Do I need gas or battery for thick weeds?
Gas trimmers generally provide the most sustained torque for heavy growth, while high-voltage battery models like 56V or 40V systems can handle thick weeds with less maintenance.
What cutting swath is best for thick weeds?
A 16 to 17 inch swath is a good balance for thick weeds, letting you cover ground faster without adding too much weight.
Can a string trimmer cut woody brush?
Most string trimmers struggle with woody brush, but models that accept metal blades or heavy line, such as certain Stihl and Husqvarna units, can handle it better.
Is a straight shaft better than a curved shaft?
A straight shaft typically gives better reach under fences and around obstacles, which helps when clearing thick weeds in tight spots.
How often should I replace trimmer line?
Replace line when it wears down or breaks frequently, and consider thicker line diameters for dense weeds to reduce breakage.
Are battery trimmers powerful enough for overgrown yards?
Higher-voltage battery trimmers, generally 40V and above, can handle overgrown yards, though runtime depends on battery capacity and cutting conditions.
Our verdict
The Husqvarna 128LD remains the strongest all-around choice for thick weeds thanks to its 28cc engine and 17-inch swath. If you prefer cordless, the EGO Power+ ST1623T delivers gas-like performance with easier line loading. Match the power source to your yard size and maintenance preferences before buying.