-Gro Water Soluble Bloom Booster Flower Food, 4 lbs. is specially formulated to promote bigger plants and more vibrant blooms, enhancing the color and beauty of your garden. This flower food starts working instantly, making it an i choice for all flowering annuals and perennials. It can be conveniently used with the -Gro feeder or simply applied with a watering can. For results, feed your plants every 7 to 14 days to keep them blooming beautifully. Model Number: