Last weekend I mixed 1/2 cop Epsom Salts in a gallon of water and sprayed all my plants. Three days later all my mint is dead. No noticeable affect on the others yet (Orchids, bananas, 20 varieties of peppers, tomatoes, zinnias, Jerusalem artichokes, garlic, horseradish, lilies and a few other flowers). I'll post more results when/if they are noticed.