Espoma Flower-tone 3-4-5 is a premium flower food formulated to feed annuals and perennials. Flower-tone is low in nitrogen and high in phosphorous and potassium, which results in vigorous plant growth and abundant blooms. This natural formula breaks down gradually, providing safe, long-lasting nutrients throughout the growing season. Flower-tone contains Bio-tone, a special blend of beneficial microbes that ensure superior plant growth.