In UK shops you'll rarely see the words string trimmer. The same tool is sold as a grass trimmer or, more often in conversation, a strimmer, and it tidies the edges a mower can't reach. After weeks with UK roundups, spec sheets and amazon.co.uk listings, the best string trimmer for most gardens is the Bosch UniversalGrassCut 18V-26-500, with a semi-automatic spool, a telescopic shaft and tap-and-twist edging, sold here as a bare tool.
A plain word on method: I haven't run all ten round my own raised beds. This list is built from research, a few picks have no reviewer behind them, and I flag those. Three are bare tools that need a battery you may already own, so check what's in the box before you buy.

What each listing gets you, what the specs mean on a British lawn edge and where each strimmer falls short. Picks without editorial backing are flagged as listing-led.
#1 · Editor's Choice
The edges along my raised beds are where the mower gives up and a trimmer earns its keep, and this Bosch is the one I'd pick for that job. The UniversalGrassCut 18V-26-500 has a 26cm cutting width, a semi-automatic spool that feeds line each time you release the trigger, a telescopic shaft and EdgeSimple, which turns it into an edger with a tap and twist of the handle. It featured in a UK roundup I read. Note, though, that this listing is the bare tool, so you'll need an 18V Power for All battery and charger unless one already lives in your shed.
The verdict: The best string trimmer for most UK lawns, as long as you budget for the battery.
#2 · Runner-Up
Bigger lawns are where the Ryobi earns its place. The RY18LT33A-0 cuts a 33cm swathe, noticeably wider than the Bosch, so a long lawn edge or the grass along a fence line takes fewer passes. It belongs to Ryobi's 18V ONE+ range, which matters more than any single spec, because you're buying it without a battery or charger. If a Ryobi drill or hedge trimmer already sits in your garage, that's an easy add. The listing is thin on detail, though it did appear in one UK roundup.
The verdict: A wide-cutting bare tool that makes most sense for existing ONE+ owners.
#4 · Best for Small Gardens
For a small garden, this is the kit I'd look at first. Black+Decker's STC1820PC-GB comes with an 18V battery and charger, weighs approximately 2.6 kg according to the listing, and cuts a 28cm swathe. A flip-to-edge mechanism and guide wheel handle the lawn edges, the shaft is telescopic, and a Power Select setting lets you trade cutting power for runtime. It appeared in more than one UK roundup. The trade-off is that 28cm swathe, narrower than the Ryobi's, so a bigger lawn takes longer.
The verdict: A light, complete kit for small gardens and tidy borders.
#5 · Best for Makita Owners
Makita owners can skip straight to this one. The DUR193Z is a bare tool, with no batteries or charger, built around the 18V LXT platform and a 260mm cutting diameter. It uses an easy-loading bump-and-feed head with 1.65mm four-leaf nylon cord, a telescopic shaft with 190mm of adjustment, an angle-adjustable motor head and an edger function. I found no UK roundup backing this model, so treat it as listing-led, and bump feed means tapping the head on the ground for more line, unlike the Worx's button.
The verdict: A compact bare tool for anyone already invested in Makita batteries.
#6 · Best Corded
Corded trimmers still make sense on a small lawn near the house, and the Contour 500E is a familiar name in British sheds. It runs a 500W motor with a 25cm cutting width and an automatic double line feed, and you twist the head to switch from trimming to edging, with a wheel to guide it along the lawn edge. A plant guard keeps the line off tree trunks and shrubs. It turned up in a UK roundup during my research. The cable limits how far you can roam, and 25cm is the narrowest cut in my ten.
The verdict: A sensible mains trimmer and edger for small lawns close to a socket.
#7 · Best Twin-Battery Kit
Two batteries in the box is the reason this Greenworks is here. One runs while the other charges, useful on an allotment where the paths have got away from you. The trimmer cuts a 30cm width with autofeed 1.65mm line, weighs 2.76kg according to the title, and adds an adjustable front handle, a split shaft for storage, variable speed for gentle work near plants and a plant guard for tree bark. The drawback is the separate 40V system, which won't share batteries with 18V platforms like Ryobi or Makita.
The verdict: The pick for longer sessions, if you're happy to join a 40V battery system.
#8 · Best Petrol
Petrol is for rough corners and long grass well away from a socket, and Stihl's FS 40 is the entry point to that world. The listing gives a 27.2cc two-stroke engine, 0.7kW of power, a 0.34L fuel tank, a 380mm cutting width and a weight of 4.4kg, heavier than every battery trimmer here. I couldn't find a UK roundup that covered this exact model, so this pick is listing-led. You'll be mixing two-stroke fuel and pull-starting it, and the noise means ear defenders, plus the eye protection Stihl specifies.
The verdict: A straightforward petrol trimmer for big, rough plots away from power.
#9 · Best for Overgrown Plots
I'll be blunt: this is the heavy-duty option. Hyundai's HYBC5200X is a 52cc petrol trimmer and brush cutter combo, supplied with a nylon line head for grass and edging plus a 255mm steel blade for brambles and dense overgrowth. The cutting width is listed at 450mm, a twin shoulder harness spreads the weight, and the shaft splits in two for a car boot. No reviewer I found covered it, so this one rests on its listing. It's far too much machine for a tidy suburban lawn, and a steel blade calls for the full protective kit Hyundai specifies.
The verdict: Buy it for clearing overgrown plots and brambles, not for edging a neat lawn.
#10 · Best Two-Speed Kit
Stanley's V20 trimmer ships complete, V20 pack and charger included, so it's a sensible all-in-one for a medium garden. It cuts a 33cm swathe with a single 1.6mm line on automatic feed, offers two speeds of 5500 and 7200 RPM for trading power against runtime, and adds an edge protector, a movable auxiliary handle and a hanging hook for the shed wall. It's a new listing with no editorial backing, so I'm judging it on specs alone. That swathe matches the Ryobi, with the battery thrown in.
The verdict: A promising complete kit for medium gardens, with no track record yet.
We didn't run these trimmers through a lab or a test lawn. The ranking is built from UK editorial roundups, manufacturer spec sheets and amazon.co.uk listings, cross-checked against each other. Where a listing gave two weights, contradicted itself on what's in the box or quoted a figure from a different model, I left the number out.
What we compared for every trimmer:
How we weighted the scores:
First, match the trimmer to the job. For tidying lawn edges and the strip along a fence in a small garden, a light cordless or corded model with a 25cm to 30cm cutting width is plenty. Bigger lawns and long grass along paths suit a 33cm swathe like the Ryobi or Stanley, and if you're clearing thick weeds, brambles or an overgrown allotment, look at petrol, such as the Stihl FS 40, or a brush cutter combo like the Hyundai. If edging matters, choose a model with a rotating head and guide wheel, as on the Bosch, Worx, Black+Decker and Flymo.
Next, the power. Kits with a battery and charger, like the Worx, Black+Decker, Greenworks and Stanley, are the simplest buy. Bare tools such as the Bosch, Ryobi and Makita suit people who already own that brand's batteries, since Power for All, ONE+, LXT and Greenworks 40V packs don't swap. Corded electric trimmers are the cheap string trimmer option and never run flat, but the cable ties you to gardens near a socket. Line feed matters more than people expect: automatic and push-button systems save you stopping to bump the head, which suits beginners.
Finally, comfort and protection. A telescopic shaft and adjustable front handle stop you hunching over. Entry-level corded models cover small lawns, mid-range cordless kits suit most homes, and petrol is for big, rough plots. Whatever you buy, read the manual, wear eye protection and sturdy footwear, add ear defenders for petrol, and check the grass for stones, hedgehogs and toys before you start. If you want one trimmer for a typical garden and you're happy to buy a battery, get the Bosch UniversalGrassCut and call it a day.
| Product | Cutting Width | Line Feed | Power and Kit | Our Score |
|---|---|---|---|---|
| Bosch UniversalGrassCut 18V-26-500 Cordless Grass Trimmer, Bare Tool | 26cm | Semi-automatic spool | 18V Power for All, bare tool | 9.8 |
| Ryobi ONE+ RY18LT33A-0 33cm Cordless Grass Trimmer, Bare Tool | 33cm | Not listed | 18V ONE+, bare tool | 9.6 |
| Worx WG163E 20V Cordless Grass Trimmer and Edger | 30cm | Command Feed push-button | 20V PowerShare, battery and charger | 9.5 |
| Black+Decker STC1820PC-GB 28cm Cordless Grass Trimmer Kit | 28cm | Auto-feed spool | 18V, battery and charger | 9.3 |
| Makita DUR193Z 18V LXT Cordless Line Trimmer, Bare Tool | 260mm | Bump and feed | 18V LXT, bare tool | 9.1 |
| Flymo Contour 500E 500W Electric Grass Trimmer and Edger | 25cm | Automatic double line feed | 500W corded | 9.0 |
| Greenworks 40V Cordless Grass Trimmer with Two Batteries | 30cm | Autofeed 1.65mm line | 40V, two 2Ah batteries and charger | 8.9 |
| Stihl FS 40 27.2cc Petrol Grass Trimmer | 380mm | Not listed | 27.2cc 2-stroke petrol | 8.8 |
| Hyundai HYBC5200X 52cc Petrol Strimmer and Brush Cutter Combo | 450mm | Not listed | 52cc 2-stroke petrol, brush cutter blade | 8.7 |
| Stanley V20 18V Cordless String Trimmer Kit, STCST933M1-GB | 33cm | Automatic 1.6mm line feed | 18V V20, battery and charger | 8.6 |
For most UK gardens, the Bosch UniversalGrassCut 18V-26-500 is the best pick here, provided you have or buy a Power for All battery. If you want everything in one box, the Worx WG163E and Black+Decker STC1820PC-GB come with a battery and charger. The Stihl FS 40 suits rough ground away from power.
Yes, they're the same tool under different names. String trimmer is the American term, while UK shops usually say grass trimmer, line trimmer or strimmer, which began as a trade name and became everyday British slang. Whatever the label, it spins nylon line to cut grass a mower can't reach.
A strimmer uses nylon line for grass and soft weeds, while a brush cutter uses a metal blade for brambles, nettles and woody growth. Some machines do both, like the Hyundai HYBC5200X here, which comes with a line head and a 255mm steel blade. Read the manual and wear the protective kit the maker specifies before fitting a blade.
Use the line diameter your trimmer's manual specifies, because the wrong size can jam the spool or strain the motor. Most cordless garden models take thin line, such as the 1.65mm on the Makita and Greenworks or the 1.6mm on the Stanley. Heavier machines like the EGO use 2.4mm line, which copes better with thick weeds and long grass.
Some people soak nylon line in water for a day before use, believing it makes old line less brittle and less likely to snap. The evidence is mostly anecdotal, though it's unlikely to do any harm with plain nylon. Storing spare line somewhere cool and out of direct sunlight is the simpler habit.
Only on very small patches of grass. A string trimmer is built for edges, corners and long grass around obstacles, so cutting a whole lawn with one is slow and tends to leave an uneven, scalped finish. For a tiny front lawn or wild areas you don't mow, it can work, but most gardens are better served by a mower plus a trimmer for the edges.
If you already own, or don't mind buying, an 18V Power for All battery, the Bosch UniversalGrassCut 18V-26-500 is the string trimmer I'd choose for lawn edges and borders. Want everything in the box? The Worx WG163E with its wheeled edger is the stronger kit. For long grass and rough corners away from power, the Stihl FS 40 is the petrol pick.
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