Using salt is an effective way to kill a tree. The sodium in salt will prevent a tree's flow of potassium and magnesium, both of which are vital ingredients in the making of chlorophyll. ... You can simply make a line of salt around the tree, and it will die. However, most everything around the tree will die as well.

How much salt will kill a tree?

If you need to kill a tree – and there are many good reasons – salt can be the best solution, especially if you're not comfortable with herbicides. Mix a solution with a very high amount of salt – two cups of water with one cup of salt should do it. Drill holes around the roots and pour your solution into the holes.

How long does it take for rock salt to kill tree roots?

Rock Salt Can Kill Roots by Drying Them Out

Let the compound work its magic for 8 to 12 hours, avoiding flushing your toilet or running any water that will drain into your affected pipe.