Jack's Classic line includes professional grade fertilizer for the home gardener. Feed your plants with the best quality fertilizer to allow for continued plant health over time. All-Purpose Water-Soluble Plant Food 20-20-20 is made from balanced nitrogen, phosphorus and potassium for use on all indoor and outdoor plants. Blended with an enhanced micronutrient package which provides optimal nutrition for strong roots and green foliage to feed through both the roots and the leaves. This formula can be used on all indoor and outdoor plants, trees, shrubs, vegetables, and turf. More professional growers have used this product for all their growing needs than any other formula. It is a balanced blend with fully chelated trace elements that work well on all plant materials as a general-purpose fertilizer.