Miracle-Gro® Water Soluble Bloom Booster® Flower Food is a special plant food developed with high phosphorus for maximum color and bloom yield Starts to work instantly for quick, beautiful results. It feeds plants through leaves (foliar) as well as roots (soil zone). Easiest when used in the Miracle-Gro® Garden Feeder™, and is Ideal for containers, window boxes; annuals and perennials. Safe for plants – won’t burn when used as directed or harm other plants