How To Kill Tree Stump With Epsom Salt. Pack each hole with epsom or rock salt. Pour a thick layer of epsom salt on all exposed roots to prevent to roots from carrying moisture and nutrients to the base of the tree.
The epsom salt will slowly pull water from the stump, basically consuming the moisture, leading to a dry, rotted tree stump. Brittle, dark wood is dead; When given in excess, it will kill the plant instead of feeding it.
Besides that, it can also be used to kill stumps.
Using a 1/2″ drill bit or similar size begin by drilling holes in the stumps starting three inches from the outer edge and working your way inside. In other words, this process will kill the stump — just as it would have killed the tree. Reapply salt and water as needed. A mix of epsom salts and water can effectively kill off unwanted tree stumps.