Weeds that grow in cracks are awkward to deal with, although after heavy rain it’s sometimes possible to tease out the plant with its roots.
Boiling water is one way to control these weeds – unlike using pesticides, you don’t have to wait for a dry spell, avoid windy days or worry about your children, pets, bees or other life. We boil a kettle and then direct the water onto the weed leaves and try and trickle some water down to the roots. It often needs repeat treatments to kill perennial roots, but each dousing kills leaves and weakens the roots.