We removed a diseased cherry tree and adjacent old corkscrew willow in our side yard. I want to kill the stump and roots, then grind them out for replanting another cherry tree plus something yet to be chosen. What are the best options to kill the stump and roots, and shooting for the shortest time to replant? The tree remover uses Tordon (?), and I have also read epsom salts can also be used to dry up the stump and roots. I plan to replant a cherry in the vicinity of the willow, to avoid any possible infection from the old cherry as well.