Will boiling water kill thistles? – Quora. Yes it will – but! You need to ensure that all the underground parts of the plant is heated enough to kill them.

How do I permanently get rid of thistles?

Apply herbicides to kill thistle, especially in spring and fall, before thistles can flower and seed. Use glyphosate for your garden, and use a broad-leaf herbicide containing 2,4-D or MCPP for your lawn. Since glyphosate kills all plants, you must keep application specific.

Will boiling hot water kill weeds?

The boiling water treatment is inexpensive and effective in burning weeds. Hot water works better on broad-leaf weeds than it does on established perennials, woody plants and grass, according to University of California Integrated Pest Management Online.