Schultz All Purpose Liquid Plant Food Plus feeds both indoor and outdoor plants. Mother Nature feeds plants every time it rains, which dissolves nutrients and distributes them evenly to all plants. Schultz Liquid Plant Food Plus does the same thing. Just add 7 drops of concentrated plant food liquid per quart of water with the easy-to-measure dropper. The plant food instantly provides vital micronutrients every time you water. Excellent for transplanting, repotting and rooting.