The most popular and recommended tree killer used by arborists is called Tordon. Simply apply Tordon to a freshly cut stump (within 30 min)and Tordon will kill even the hardiest of trees.

How much rock salt does it take to kill a tree?

Mix 1 cup of rock salt with 2 cups of water. Add it to spray bottle or pour it directly over the plants you want to kill. Using boiling water helps dissolve the rock salt and kill the plants — boiling water hurts their leaves just like it does your skin.

How much salt will kill a small tree?

Pour 3 cups of water into a container, then add 6 cups of salt. Mix the two together. You can change the amount of solution you mix by maintaining a ratio of one part water to two parts salt.