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How to use a weed burner

Updated: October 2026

The usual mistake is to hold the flame until the weed is black. That is how a paving joint becomes a scorch mark, and how a dry stem passes heat to a fence. How to use a weed burner, on a UK patio, means a brief pass so the leaf wilts, water ready before you start, and the tool cold before it goes near a shed. The [weed burner comparison](/hub/weed-control/weed-burner) lists the wands, hoses, and hot-air sticks. Surfaces such as resin and block paving are on the [weed burner for patio](/hub/weed-control/weed-burner/sub/weed-burner-patio-and-driveway) page. Gas or mains is the [gas or electric weed burner](/hub/weed-control/weed-burner/sub/weed-burner-gas-or-electric) fork. We used amazon.co.uk listings and UK fire-service advice, not a lab, and this is not a licence to burn weeds in a drought.

The usual mistake is to hold the flame until the weed is black. That is how a paving joint becomes a scorch mark, and how a dry stem passes heat to a fence.

Our top picks

Gloria Gloria Thermoflamm hose set

Best overall

Gloria Gloria Thermoflamm hose set
8.8/10about £33.80
View offer
Onkruidbrander Onkruidbrander weed burner, 4 cans

Preis-Tipp

Onkruidbrander Onkruidbrander weed burner, 4 cans
8.2/10about £14.95
View offer
My Garden Outdoor Living My Garden electric weed burner

Alternative

My Garden Outdoor Living My Garden electric weed burner
6.8/10about £28.34
View offer
On this page
  1. 1.What you are trying to do
  2. 2.When not to start
  3. 3.A careful pass
  4. 4.When the clicker fails, and when to stop

What you are trying to do

You are heating the leaf, not burning a hole in the joint. A short exposure bursts cells in soft growth. The plant then wilts over the next hours or the next day. Gardeners' World says the same of a mains thermal weeder: short bursts, away from furniture and plants you mean to keep. Charring the crown looks thorough and does not pull a dandelion root out of a crack. The Royal Horticultural Society still prefers a knife, a brush, and a taproot tool on hard surfaces, and it treats burners as a poor match for deep-rooted perennials. Picture one chickweed in a 10 mm joint. You pass the heat, you move, and you look back later rather than standing until a slab edge softens. Grasses and established perennials often need another visit.

When not to start

Royal Berkshire Fire and Rescue Service, on 29 August 2025, advised against gas and electric weed burners when growth is dry. Merseyside Fire and Rescue Service gives the same warning. Shropshire has warned after gas burners set gardens alight. Cheshire Fire’s advice, reported after an Ellesmere Port fence fire, covers gas and electric, tells you not to use a naked flame in wind, and tells you not to fight a spreading fire. You get clear and you call 999. If the day is suitable, Berkshire’s points still apply: heat on the weeds only, water ready, gas off, and the tool stored only when it is cold. Shropshire adds that you should damp the treated area and store cylinders away from heat.
Gloria Gloria Thermoflamm hose set

Testsieger

Gloria Gloria Thermoflamm hose set
8.8/10about £33.80
View offer

A careful pass

Clear toys, doormats, and dry leaves from the joints. Point the head at the weed, not at the fence, the shed, the car, or the decking. Keep a mains cable behind you so you do not walk it across the nozzle. A leaflet for one other electric weeder, not a standard for Thrink or My Garden, is still a sound habit: an outdoor lead, the reel unwound, an RCD if you have one, and the cable behind the tool. Electrical Safety First makes the same reel point. A 2,000 W stick is about 8.7 A at 230 V. A coiled indoor reel is the wrong lead. Move. A brief pass, then the next joint, beats a dwell you invent in order to see black.

When the clicker fails, and when to stop

Reviews of the Onkruidbrander and the Green Haven wands say the piezo works once, or for a few uses, and then dies. People light the wand with a fire lighter. That is another naked flame, close to a canister, while you aim at a narrow crack. This page will not tell you how to rebuild the igniter. If you will not accept that second flame, use the knife. If a canister seal is loose, which one Green Haven review describes as a bottle that fell off, you stop. You do not tighten a leaking can while it is alight. A Gloria review describes lighting with a match. That extra flame is only reasonable with the gas controlled, outdoors, and water already out.

Common questions

Do I burn the weed until it is black?
No. You want the leaf to wilt afterwards, not a charred crown and a scorched slab. Blackening still leaves a deep root in the joint. The Royal Horticultural Society prefers a knife for those perennials on hard surfaces.
How long do I hold the heat on one weed?
Long enough for a brief pass, then you move. Fire services do not publish a dwell time in seconds, so a farm fraction of a second is not the UK method, and another brand’s warm-up time is not these listings. If the slab or a timber edge is heating, you have stayed too long.
Can I use it on a hot, dry day?
Royal Berkshire, on 29 August 2025, says not to, for gas and electric burners, when growth is dry. Merseyside, Shropshire, and Cheshire give the same kind of warning. A brown lawn and a breeze are a day for the knife, or for waiting.
What if the clicker will not spark?
Reviews say the piezo fails early and buyers use a lighter. That lighter is a second flame next to the canister. Use it only if you accept the risk, with water ready. A leaking seal, as in one Green Haven review, is a reason to stop. This is not a repair guide.
When is the tool safe to put in the shed?
Only when the head is cold and, for gas, the supply is off. Essex linked a shed fire on 25 August 2023 to a burner stored hot. A My Garden review notes the head stays hot. Shropshire also says to store cylinders away from heat.
Will one pass kill a dandelion?
Do not expect it to. Deep roots are why the Royal Horticultural Society prefers a taproot tool. Heat may wilt the leaves, and the plant often needs another visit. These listings give no success rate.
What do I do if the fence catches?
Get away and call 999. Cheshire’s reported advice after the Ellesmere Port fence fire is not to fight a spreading garden fire. Do not go back for the wand.

Related pages

Weed burner buying guide

Weed burner

Best weed burner for a patio, a wand or a cylinder

Gas or electric weed burner: flame, cable or a hose

Weed burner for patio joints, gravel and a driveway

Sources

Public UK sources, last checked on 15 October 2026. Shelf prices and star lines are the amazon.co.uk figures for these listings. Listed temperatures are manufacturer claims, not a test run for this page.

  1. RHS: Weeds on hard surfaces (retrieved 15 October 2026)
  2. Royal Berkshire Fire and Rescue Service: weed burners, 29 August 2025 (retrieved 15 October 2026)
  3. Essex County Fire and Rescue Service: shed fire, 25 August 2023 (retrieved 15 October 2026)
  4. Merseyside Fire and Rescue Service: barbecue and garden safety (retrieved 15 October 2026)
  5. Gardeners' World: patio weeders (retrieved 15 October 2026)
  6. Camping and Caravanning Club: gas for tent campers (retrieved 15 October 2026)
  7. BEAMA: extension lead safety checklist (retrieved 15 October 2026)
  8. amazon.co.uk listings, captured 15 October 2026 (retrieved 15 October 2026)