How to Use a Torch to Burn Weeds

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Avoid time-consuming hand weeding and use a propane torch.
Avoid time-consuming hand weeding and use a propane torch. (Image: Hemera Technologies/AbleStock.com/Getty Images)

Whether you have used herbicides to kill the weeds and they haven’t worked or you don’t want to spray harsh, pollutant chemicals, you can try burning your weeds with a propane torch. Torches do not work as well on lawns and might actually harm your grass, but if herbicides do not work, a torch will. Typically, torches are used to burn weeds that are growing up between sidewalk cracks, in the roads and in driveways where they are surrounded by asphalt, rock or concrete instead of grass, bushes or other vegetation. Propane torches heat the cells causing them to expand and burst, killing the weeds.

Things You'll Need

  • Propane torch
  • Safety carrying case
  • Flint lighter
  • Leather gloves
  • Hard hat
  • Face shield
  • First aid kit (optional)
  • Backpack (optional)

Contact the fire department before burning any weeds. Ask the department if weather conditions are favorable for burning your weeds. Listen to the firefighters’ advice and follow their instructions carefully. Obtain a burn permit from the fire department if one is needed.

Carry the propane and torch in a safety case to the location where you will be burning weeds.

Load your backpack so that the pressure valve is pointing away from you if you are using a torch that requires a backpack. Keep your backpack or propane tank away from the flame.

Ignite the propane torch with a flint lighter. The torch heats quickly, so don’t lay the torch down.

Steady the torch about six to 12 inches above the weed. Walk slowly as you swish the torch from side to side so that it overlaps.

Burn the plant until it begins to wilt. This is enough to kill the weed. If you hold the fire over the weed until it catches on fire, this stimulates root growth. Focus your burn on the stem base.

Search for wilting 24 hours after you burn the weeds. Burn the weeds the rest of the way once they are dried out and dead. This might be one or two days after your first burn.

Allow your torch to cool down completely before you disconnect and store it.

Repeat the treatment the next season.

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