Miracle-Gro Water Soluble Bloom Booster Flower Food is specially formulated to help boost vibrant and healthy blooms on all flowering plants as opposed to unfed plants. This fertilizer works great with all flowering plants, in containers or in-ground, annuals or perennials. You only have to feed the plants with this formulation every 7 to 14 days to enjoy more abundant and more beautiful blooms. This Bloom Booster starts to work at once for fast and beautiful results. Use it as directed without the worry of burning the plants or harming other plants. This breakthrough in gardening has a guaranteed fertilizer analysis of 15-30-15. Available in a 1.5 lb. box enclosed with a handy scoop and works great with a Miracle-Gro Garden Feeder.