PRO-MIX ROOT BOOSTER 5-15-5 is a liquid concentrate that contains two plant growth regulators to stimulate rapid and vigorous root development as well as strong plant growth. Its high phosphorus content will help reduce transplanting stress. Ideal for transplants, trees, shrubs, perennials, bedding plants, seed beds, cuttings, garden vegetables and herbs. Can be used indoors or outdoors. Comes in a 1-L container. With PRO-MIX ROOT BOOSTER 5-15-5, you’re sure to get great results!