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 generations, this product may be used in combination with Jack’s Classic Blossom Booster giving your plants greener leaves, more flowers and brighter colors. Use for all indoor and outdoor plants: bedding and container plants, trees and shrubs, vegetables, fruits and turf.