Jack's Classic All Purpose (20-20-20) - 4lbsJack's All Purpose 20 20 20 is considered the industry standard of general purpose fertilizers by professional growers. It feeds both through the roots and the leaves. This formula of nitrogen, phosphorus and potassium provides fast green up and rapid leaf expansion. Recommended for use on all your indoor and outdoor plants. Indoors it is especially effective on foliage plants, keeping leaves green. A proven performer in the vegetable garden for