Miracle-Gro LiquaFeed Bloom Booster Flower Food Refill Pack, 2-Pack (Liquid Plant Fertilizer Specially Formulated for Flowers) Promotes more blooms for greater color - versus unfed plants Feeding as easy as watering Feed every 1-2 weeks Use with a Miracle-Gro LiquaFeed Feeder Each bottle feeds up to 400 sq. ft.