PondCare Aquatic Potted Plant Food Fertilizer, 3.8 Oz 25 Tablets Contains macronutrients and essential trace elements to promote lush plant growth. Continuously releases iron and boron to promote non-stop plant blooming and flower formation. Formulated for all aquatic plants, including water lilies, lotus, and iris. Designed to be placed directly into the soil of potted plants. Fertilizer tablets do not promote algae growth.