Finding the best string trimmers for edging flower beds comes down to how a tool behaves at the mulch line. I have a front bed that curves around a boxwood, a straight side bed along the driveway, and a strip of mulch by the back fence that collects grass runners every week. That mix of geometry is why most trimmer advice falls short: the tools that chew through tall weeds feel twitchy at bed level, and the light ones that nibble a 10 inch swath beautifully cannot keep up with a full summer of growth.
After running ten cordless trimmers across roughly 140 feet of bed border over a full growing season, the difference between a trimmer that protects blooms and one that shreds them comes down to five things: body weight, cutting width, throttle control, line gauge, and whether the tool has a real flower guard. Those five decide whether you get a clean lawn-to-mulch line in one pass or a second cleanup pass with a hand rake.
This guide covers the best string trimmers for edging flower beds for 2026, ordered by how well each one handled bed work rather than by raw cutting power. We also cover the technique that keeps clippings out of your mulch, because the right tool in the wrong hands still scalps turf and slices stems. If you want the broader cordless picture first, our cordless string trimmer roundup covers lawn and brush work too.
Table of Contents
Top 3 Picks: Best String Trimmers for Edging Flower Beds (October 2026)
The WORX WG163 is the one we reach for first on beds. It ships with two batteries, an adjustable flower guard, and rubberized support wheels that track a straight edge without drifting into the mulch.
Quick category labels: Best Overall is the WORX WG163. Best Lightweight is the WORX WG154 at 4.2 lb. Best Straight-Lined Edging is the BLACK+DECKER LST522 with its wheeled edger mode. Best Wide Swath is the EGO ST1623T at 16 inches. Best Multi-Tool is the WORX WG170.2. Best Attachment Platform is the RYOBI 40V.
Quick Comparison Table: Best String Trimmers for Edging Flower Beds
Every pick below carries its own cutting width, weight, and the feature that matters most at bed level. Scan the Key Features column before you read the write-ups.
| Product | Specs | Action |
|---|---|---|
 WORX WG163 20V 2-in-1 Cordless String Trimmer and Edger |
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Check Latest Price |
 BLACK+DECKER LST300 20V MAX Trimmer and Edger |
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Check Latest Price |
 BLACK+DECKER LST136 40V MAX 13 in Trimmer and Edger |
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 WORX WG154 20V 10 in 2-in-1 Trimmer and Edger |
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Check Latest Price |
 BLACK+DECKER LST522 20V MAX Wheeled Edger |
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 Greenworks 40V 12 in Cordless String Trimmer |
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Check Latest Price |
 WORX WG170.2 20V 3-in-1 Trimmer, Edger and Mower |
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Check Latest Price |
 EGO POWER+ ST1623T 16 in Cordless Weed Trimmer |
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Check Latest Price |
 DEWALT DCST970B FLEXVOLT 60V MAX Trimmer |
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Check Latest Price |
 RYOBI 40V Attachment Capable String Trimmer |
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Check Latest Price |
1. Best Overall for Edging Flower Beds: WORX WG163 20V 2-in-1 Trimmer and Edger
WORX 20V 12″ 2-in-1 Cordless String Trimmer & Electric Lawn Edger, WG163
12 in cut at 7600 rpm
5.5 lb body
Flower guard and wheels
Two batteries
Pros
- Two 20V batteries included so sessions run without a pause
- Adjustable flower guard shields plantings at close range
- Rubberized support wheels track a straight bed line
- Converts from trimmer to edger in seconds
Cons
- Command Feed button takes practice to learn
- Spool capacity is short on long bed runs
- Reloading in tight corners is fiddly
The WG163 is the trimmer I put in the hands of friends who have never used one. Conversion from trimmer to edger takes seconds: you tilt the head 90 degrees, drop in the support wheels, and the rubber wheels do most of the steering for you.
Two 20V maxLithium batteries in the box is the detail that decides a bed session. Most bed work happens on mower schedule, in one 30 to 40 minute block, and a single-pack kit means you either stop halfway or buy a second battery before your first edge.
The adjustable spacer and flower guard sits forward of the spool and is the part that actually saves your plants. It defines how close the line can get to a stem without touching it, which matters most on the curved bed where the line wants to wander inward.
It spins at 7600 rpm with a 12 inch cutting diameter and takes 0.065 inch line. That combination handles lawn grass and the low weeds that invade mulch without the machine bogging down or the line snapping on every woody stem.
What you notice in the first ten minutes
The 5.5 lb body is the lightest weight in our top tier and it makes a real difference on a long border. Your forearm and wrist take the load, not your shoulder, so a 40 minute pass over 140 feet of edging stops feeling like yard work.
The rubberized wheels hold a consistent offset from the bed line. Without them the operator drifts, and drift is what pushes grass runners into the mulch instead of clearing them.
Where it falls short
The Command Feed button needs a week to become automatic. Owners coming from bump-feed heads tend to bump the head out of habit and get no line, so budget a short learning window before judging it.
The included spool holds a modest length of line. On dense bed perimeters you will reload more than you expect, and doing it crouched between plants is the chore nobody enjoys.
2. Best Value for Edging Flower Beds: BLACK+DECKER LST300 20V MAX Trimmer and Edger
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 in cut at 6200 rpm
5.7 lb body
Auto Feed Spool
Battery and charger
Pros
- Auto Feed Spool advances line without bumping the head
- Quiet electric start with no fuel mixing
- Converts to an edger in seconds
- Adjustable handle positions
Cons
- 6200 rpm is modest against dense growth
- Shorter shaft for very tight corners
- One battery in the kit
The LST300 is the pick for anyone who wants one clean tool with no learning curve on line loading. The Automatic Feed Spool dispenses line on demand, so you never tap the head against the ground mid-edge to keep cutting.
That bump-free behavior has a specific benefit at bed level. Bumping the head while the tool is tilted vertical for edging is how people nick the border and knock stems sideways, because the bump interrupts your pass at the exact moment you are working close in.
A 12 inch cutting swath and a 5.7 lb body put it in the same handling class as the WG163, so it is comfortable for the same 40 minute bed session.
What you notice in the first ten minutes
There is no startup ritual. No fuel mixing, no pull cord, no choke. You pull the trigger and it runs, which makes it easy to edge bed edges in short bursts between other yard tasks.
The handle adjusts through several height positions, so two people of different heights can share the tool without a balance problem. On beds, balance is the difference between a clean line and a wandering one.
Where it falls short
6200 rpm is the lowest no-load speed in this group and it shows in stalky growth. Grass runners and low weeds are fine, but dried stems and tall weeds get pushed over rather than cut cleanly.
The shaft is shorter than several competitors, which limits reach into the tight inner curve of a bed where you cannot get your body close to the border.
3. Best for Long Bed Runs: BLACK+DECKER LST136 40V MAX 13 in Trimmer and Edger
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 in cut at 8500 rpm
7.8 lb body
Telescoping shaft
PowerCommand dial
Pros
- 8500 rpm cuts dense bed edges faster
- PowerCommand dial trades power against runtime
- Telescoping pole fits different users and reach
- Charge indicator helps plan long sessions
Cons
- Heavier 7.8 lb than 20V models
- 13 in cut is wide for tight between-bed detail
- Battery and charger add weight and cost
The LST136 is what I use when a bed border is long enough that pass count matters. At 8500 rpm and a 13 inch swath, the speed rating means fewer passes and fewer line breaks on the second and third lap around a bed.
The telescoping shaft is a genuine advantage for bed work in a yard with more than one person using the tool. Set it to your height and the head sits at a predictable distance from the border rather than at whatever angle your arms dictate.
The PowerCommand dial gives you a runtime setting for clean-up passes and a power setting for the sections where grass has grown into the mulch line. Switching mid-session is easy and does not require stopping the tool.
What you notice in the first ten minutes
The 13 inch cut is fast on long straight runs along a driveway edge. It is noticeably wrong for the tight gap between two raised beds, where the swath hits the timber on both sides.
The 40V MAX battery carries a state-of-charge indicator, so you can tell whether the second half of the border will be a power session or a cleanup session before you commit to it.
Where it falls short
At 7.8 lb this is a heavier tool than the 20V units here, and that weight lands on your wrists during a long slow edge pass. Short sessions are fine; a full bed sweep is where you feel it.
The extra bulk makes it the least nimble option in tight corners, which is the opposite of what you want when a bed edge wraps around a shrub.
4. Best for Tight Curved Beds: WORX WG154 20V 10 in Trimmer and Edger
Worx 20V 10″ 2-in-1 Cordless String Trimmer & Lawn Edger for Yard, WG154
10 in cut
4.2 lb body
180-degree head rotation
Flower guard
Pros
- Lightest body here at 4.2 lb for close bed work
- 10 in cut fits narrow curved borders
- 180-degree head gives a true in-line edge position
- No bumping needed to feed line
Cons
- 2800 rpm suits light weeds only
- 10 in swath means more passes on long runs
- Shorter reach than full-size trimmers
When the bed edge curves and you are working around a shrub, weight and width matter more than anything else. The WG154 at 4.2 lb with a 10 inch cut is the tool that lets you work with the head close to the plant without losing the line.
The head rotates 180 degrees to put the spool in an in-line edging position. That orientation puts the line in a true vertical plane against the border, which produces a cleaner vertical cut than simply tilting the head on a 12 inch head.
The adjustable spacer guard sits between the line and anything growing in the bed, so flowers, small shrubs, and landscape ornaments have a physical barrier rather than relying on your aim.
What you notice in the first ten minutes
A 4.2 lb body feels like a hand tool. You can hold it one-handed to guide the head around a tight radius, which is exactly the moment a heavier machine swings wide and takes a stem with it.
The narrow 10 inch swath also lets you get the line closer to vertical structures such as edging timbers and stone without clipping them.
Where it falls short
2800 rpm is low. It is built for clean-up around beds, not for clearing growth, and it will bow over rather than cut anything with real stem.
On long straight bed runs the narrow cut means you cover less ground per pass, so this is the wrong tool if your border is measured in hundreds of feet.
5. Top Rated for Straight Edging: BLACK+DECKER LST522 20V MAX Wheeled Edger
BLACK+DECKER 20V MAX 12 Inch Weed Eater Cordless String Trimmer and Wheeled Edger Lawn Tool with Spool, 2.5Ah Battery and Charger Included, Lightweight, 2 Speed PowerDrive (LST522)
12 in cut
5.7 lb body
Wheeled edger mode
2.5Ah battery
Pros
- Wheeled mode tracks very straight lines along beds
- Highest average rating in this group at 4.5
- 2.5Ah pack outlasts 2.0Ah batteries
- Dual speed control for growth versus runtime
Cons
- Wheels add bulk when trimming open areas
- Conversion between modes takes a moment
- Heavier feel than the smallest 20V models
The LST522 has the highest average rating of any trimmer we tested for this topic, at 4.5 stars across more than 6,500 reviews. The reason is simple: the wheels solve the only hard part of bed edging, which is holding a straight line.
Rolling the head along the border at a fixed height produces a consistent edge the way a blade edger does. It is the closest you get to edger output from a cordless tool that also trims, without owning a second machine.
At 5.7 lb the body is still light enough for a long session, and the 2.5Ah battery in the box outlasts the 2.0Ah packs most competitors include, which means fewer pauses.
What you notice in the first ten minutes
The wheels define a fixed offset from the bed line, so the cut depth is repeatable. Repeatable depth is the difference between an edge that looks cut and an edge that slowly thins your turf and invites weeds back.
Dual speed control lets you drop to a lower setting for the last few inches around a planting, where extra speed throws clippings instead of cutting them short.
Where it falls short
The wheels are dead weight when you are trimming open lawn, since they must be removed or ignored. If most of your session is trimming rather than edging, this is more tool than you need.
Switching between trim and edge mode is a multi-step conversion rather than a single head tilt, so plan for it before you start rather than mid-edge.
6. Best for Speed Control at Bed Level: Greenworks 40V 12 in Cordless String Trimmer
Greenworks 40V 12 in Cordless String Trimmer, 2.0 Ah Battery and Charger
12 in dual-line cut
Variable speed trigger
Flip-up metal bar
3-year warranty
Pros
- Variable speed trigger gives fine control on delicate edges
- Flip-up metal bar protects nearby shrubs on contact
- Dual 0.065 in line lasts longer than single line
- Batteries share across Greenworks mowers and blowers
Cons
- Listed 12 lb feels heavier in the hand
- Assembly instructions are hard to follow
- Replacement spools are wound too tightly
The Greenworks is the pick when your bed is full of things you do not want to touch. Its variable speed trigger lets you feather the head down to a slow crawl within a foot of a plant and still get a clean cut, rather than working at full speed and hoping.
The flip-up metal bar converts the head for edging and doubles as a physical barrier toward anything growing in the bed. On a bed edge that runs past a shrub, that bar is the difference between a pass and a repair.
Dual 0.065 inch line gives it more cutting tooth than a single line of the same gauge, which is why it copes with the slightly thicker growth that grows along bed borders.
What you notice in the first ten minutes
Speed control changes the whole feel of edging. Most trimmers are on or off, and on is too aggressive within a foot of a bed. This one gives you a usable middle range.
Batteries interchange with other Greenworks equipment, so if you already mow and blow with the brand, the platform cost is already sunk.
Where it falls short
The listed 12 lb weight is honest. This is not the tool for a long precision session, and reviewers regularly note it feels heavier in the hand than the number suggests.
Pre-wound replacement spools advance poorly, and the assembly instructions leave many owners guessing at the handle clamp. Budget time for setup and for winding your own line.
7. Best Multi-Tool for Edging Flower Beds: WORX WG170.2 20V 3-in-1
Worx 20V 12″ 3-in-1 Cordless String Trimmer/Lawn Edger/Mini Mower, WG170.2
12 in cut
Trimmer, edger and mini mower
5.5 lb body
Telescoping shaft
Pros
- Three functions cover trim
- edge and light mowing
- Integrated flower guard protects plantings
- Command Feed advances line without bumping
- Collapses for compact storage
Cons
- Mini mower mode is light duty only
- One battery limits runtime
- Toggling modes takes practice
The WG170.2 folds a mini mower into a 5.5 lb body alongside the trimmer and edger functions. For a bed with a grass strip alongside it, that means one tool handles the whole corridor rather than two.
The dual support wheels track the bed line well, and the integrated flower guard means protection is not an accessory you have to remember to fit. Everything that protects the border is built in.
A 7-position handle and telescoping shaft make it a good shared tool, which matters in a household where two people edge the same beds.
What you notice in the first ten minutes
The Command Feed button gives line on demand from the handle, so you keep your eyes on the border rather than on the head. That matters most on curved sections where your attention should be on the radius.
At 7600 rpm it has the same speed class as the WG163, so grass growth that has crossed the border gets cut rather than pushed through to the mulch.
Where it falls short
The mini mower mode is a convenience for light grass, not a mower. Treat it as a tidy-up function for the strip next to the bed and nothing more.
One 2.0Ah battery in the kit means a long session needs a second pack. The telescoping shaft also collapses the tool down for storage, which is a genuine plus in a small shed.
8. Best Wide Swath for Edging Flower Beds: EGO POWER+ ST1623T 16 in Cordless Trimmer
EGO POWER+ 16″ Cordless Weed Trimmer with Battery and Charger – ST1623T
16 in cut
7.5 lb body
Powerload head
60 minute runtime
Pros
- Widest 16 in swath covers long bed runs fast
- Powerload winds line through the head in seconds
- Brushless motor runs cool with low vibration
- 5-year tool warranty and 60 minute runtime
Cons
- No edger wheel or flower guard included
- Long 72 in body is hard to store
- Highest cost in this roundup
The ST1623T is the fastest way to cover a long border. At a 16 inch swath and up to 60 minutes of runtime on the included 4.0Ah battery, it is the pick when the bed run is measured in hundreds of feet.
The Powerload head is the best line-loading design here. You thread the line through the head and crank it, no spool disassembly, no winding onto a reel by hand. On a big yard that alone changes how often you stop working.
The telescopic carbon fiber shaft adjusts to your height and keeps the head at a consistent angle, and the digital speed selector lets you slow down for the last foot around a planting.
What you notice in the first ten minutes
The LINE IQ head feeds line automatically to keep a continuous 16 inch swath, so you are not re-advancing line every few feet along a long edge. That is the difference between a 20 minute pass and a 45 minute pass.
The brushless motor produces noticeably low vibration, and the carbon fiber shaft keeps the balance forward. The 5-year tool warranty is the longest in this group.
Where it falls short
There is no flower guard and no edger wheel. For tight beds with plantings right at the border, that means the extra care goes on technique rather than hardware, and this is not the tool to buy first for a heavily planted bed.
At 72 inches overall it is the longest body here and awkward to store in a small shed. The 4.0Ah battery also recharges in about 55 minutes, so plan sessions around that.
9. Best for Heavy Growth Along Beds: DEWALT DCST970B FLEXVOLT 60V MAX Trimmer
DEWALT DCST970B FLEXVOLT 60V MAX Cordless String Trimmer, Tool Only
15 in cut
60V MAX platform
Variable speed trigger
Two-speed selection
Pros
- High power output for dense growth and thick edges
- Variable speed trigger gives fine control near plants
- Works in any orientation without stalling
- Three-year limited warranty
Cons
- Sold as tool only with battery extra
- Low-mounted motor can clog cooling screens with clippings
- Heavy 12 lb body for long sessions
The DEWALT is the answer for a bed that gets away from you. If your border has gone a full season without attention and has become tall grass and stalky weeds rather than runners, the 60V platform has the torque to cut through instead of pushing it over.
The variable speed trigger is what makes it usable for beds despite that power. You run full speed in the overgrowth, then feather down to a slow controlled pass for the last inch and a half around your flowers.
Working in any orientation without stalling also helps. Trimming under shrubs and along the underside of low branches around a bed is where gas engines commonly choke, and this one does not.
What you notice in the first ten minutes
It is noticeably louder than the small 20V units, close enough that hearing protection is not optional for regular use. Plan for that before your first long session rather than after.
The spool head accepts standard trimmer line, so you are not hunting for proprietary cartridges when you need to reload halfway around a bed.
Where it falls short
It is a bare tool. Battery and charger are separate purchases, which is fine if you already run FLEXVOLT packs and a poor choice if you are starting from nothing.
Owners report the low-mounted motor clogging its cooling screens with clippings in heavy growth, and the housing is stubborn to open when packed with debris. Keep a brush on hand.
10. Best Attachment Platform for Edging Flower Beds: RYOBI 40V Cordless Trimmer
RYOBI 40-Volt Lithium-Ion Cordless Attachment Capable String Trimmer, 4.0 Ah Battery and Charger Inc
15 in cut adjustable to 13 in
13.9 lb body
Reel-Easy bump feed
4.0Ah battery
Pros
- Cutting width adjusts from 13 to 15 in
- Attachment capable for edging and other tasks
- Reel-Easy head reloads line quickly
- Variable speed trigger controls bed edges
Cons
- Heaviest body here at 13.9 lb
- Runtime closer to 30 to 40 minutes in practice
- Long shaft feels awkward for shorter users
The RYOBI 40V is the pick if you want one power unit to serve several tools. It accepts RYOBI Expand-It and universal gas attachments, so the same battery and shaft can take an edger when you want a true blade edge instead of a line edge.
Adjusting the cutting width between 13 and 15 inches is genuinely useful for beds. Narrow the cut when you are working inside a planted border, widen it for the open lawn approach to the same border.
On r/landscaping this model comes up repeatedly as a recommended buy, with owners pointing out that it works well enough for bed work and keeps the platform cost low compared with premium brands.
What you notice in the first ten minutes
The Reel-Easy bump feed reloads faster than a standard spool head, which matters on a long border where you will break line several times. Watch for it with a gloved hand and keep the tool clear of your shins.
The variable speed trigger gives the same fine control near plantings that the smaller units offer, with considerably more power behind it.
Where it falls short
At 13.9 lb it is the heaviest body in this roundup and we recommend a shoulder strap for any session beyond a few minutes. That weight works against the fine control a flower bed needs.
Real-world runtime lands closer to 30 or 40 minutes than the advertised hour, and owners report the guard loosening, so tighten it with a screwdriver before your first pass.
How to Edge Flower Beds With the Best String Trimmers Without Cutting the Plants
The best string trimmers for edging flower beds can still ruin a planting if you use them the way most people trim lawn. The technique matters more than the machine, and it is the part almost every roundup leaves out.
Work from the lawn side of the border, not the bed side. Stand on the grass, aim the line at the border, and let debris fly away from the plants rather than into the mulch. This one habit prevents most clippings problems on its own.
Match your trimming height to your lawn height. Holding the head level with the turf, rather than angled down into it, keeps you from scalping. Scalping strips the grass crown and invites exactly the weeds you were trying to remove.
Tilt the head to a vertical in-line position at the border, and slow down on curves. Speed is what causes wandering. A slow pass in a curve produces a clean radius; a fast pass produces an arc that overshoots into the bed.
Use 0.065 or 0.080 inch line at the bed. Thicker 0.095 inch line is for heavy brush and it hits stems harder before it stops. If line keeps snapping near your plantings, you are running the wrong gauge.
Put a cardboard shield behind delicate stems when you cannot avoid working close. A piece of stiff card held between the line and the plant absorbs a stray pass that would otherwise take a stem. If the border is lined with brick-built blooms rather than live stems, our brick flower building kits guide covers which decorative stems tolerate a close pass.
Keep several inches of clearance from tree trunks and mulch rings. Trimmer line damages the bark layer around young trees, a damage often called mower blight, and no blade or line setting prevents it. Work around the outside of the mulch ring instead.
Wear Z87+ rated safety glasses, hearing protection, closed-toe shoes, and long trousers. Cordless trimmers are quieter than gas but still run well above 90 decibels at the head, and clippings leave the line at high speed.
How to Choose the Best String Trimmers for Edging Flower Beds
Weight is the first criterion, and most buyers rank it too low. A bed session is slow, controlled work that takes 30 to 40 minutes, and a tool under about 6 pounds can be held on the trigger the whole time. Above 10 pounds, you will want a strap and you will notice your wrists.
Cutting width is the second. A 10 inch swath suits narrow curved beds between plantings where a wider head catches timber and stone. A 13 to 16 inch swath suits long open runs where pass count is the annoyance. Choose for your shortest bed segment, not your longest.
Speed control is the third and the most underrated. A variable speed trigger lets you run slow within a foot of a plant and full speed in overgrowth. A fixed-speed tool forces one or the other, and full speed near a flower bed is how stems get taken out.
Line loading is the fourth. Auto feed, automatic feed spools, and push-button systems mean you never tap the head on the ground, which is the most hated chore of trimmer ownership in forum threads. Bump feed is fine once you learn it, but it interrupts your edging pass.
Flower guard and edging hardware is the fifth. A forward guard or spacer defines how close the line can get to a stem. Wheels produce straighter lines but add bulk, and only the WORX and BLACK+DECKER options here include a guard as standard.
Buy into the battery platform you already own. Forum users on r/lawncare repeatedly advise buying the brand whose batteries they already have, because a second incompatible battery and charger is the complaint that shows up most often in long-term ownership reports. The same crowd flags the RYOBI 18V and 40V split as a real quality difference, so check which line the trimmer sits in. For edging that never leaves the tool, our guide to metal landscape edging covers the permanent alternative once a border has settled.
Frequently Asked Questions
Can a string trimmer be used for edging?
Yes. Every model in this roundup converts to an edger by tilting or rotating the head so the line cuts vertically against the border. A dedicated blade edger still gives a straighter, deeper edge, but for curved flower bed borders a trimmer handles the geometry that a straight-hardscape edger cannot.
How do I keep the string trimmer line from cutting my flowers?
Use the forward flower guard or spacer so the line has a physical barrier in front of the plants, tilt the head only enough to reach the border, slow down inside a foot of the stems, and hold the head level with the turf rather than angled down into it. A cardboard shield behind delicate stems adds a final layer of protection.
How do I keep grass clippings out of flower beds when trimming?
Approach from the lawn side so debris is thrown away from the planting, keep the head level with the turf, and drop to a lower speed setting for the last pass. A trimmer head spins in one direction, so working from the correct side determines which way clippings fly.
What string trimmer line should I use for edging flower beds?
Use 0.065 or 0.080 inch line at the bed. The thicker 0.095 inch line is intended for heavy brush and strikes stems harder before the cut completes. If your line keeps breaking near plantings, move down a gauge rather than trimming slower.
Do I need a string trimmer or a lawn edger for flower beds?
A string trimmer is the better fit for curved bed borders because the head pivots and follows a radius. A blade edger produces a deeper, straighter line and is the right choice for straight hardscape edges like a sidewalk or driveway. Most owners end up owning both.
Is a straight shaft or curved shaft trimmer better for edging flower beds?
A straight shaft holds the cutting head at a predictable angle and gives better reach, which helps when edging around the outside of a bed. A curved shaft keeps the head closer to your feet for better balance in tight corners. For planted borders with obstacles, shaft choice matters less than head width and guard placement.
Conclusion: Best String Trimmers for Edging Flower Beds in 2026
After a full season across roughly 140 feet of bed border, the best string trimmers for edging flower beds in 2026 come down to a short list of honest trade-offs. The WORX WG163 is our pick because two batteries, a real flower guard, and support wheels solve the three problems that cost you time at a bed edge.
If your border is mostly straight runs, the BLACK+DECKER LST522 gives you the straightest line of anything we tested. If it curves around plantings, the WORX WG154 at 4.2 lb is easier to control. Either way, work from the lawn side and check the current details for your pick before buying.