Description Give your plants an extra boost of nutrition with Miracle-Gro Shake 'n Feed Extended Boost. Our granular plant food keeps plants happy and fed for up to 6 months. Whatâs more, it can be applied to any plant, vegetable, or flower and used indoors or out. It even feeds through mulch! Miracle-Gro Shake 'n Feed Extended Boost comes in an easy-to-use shaker bottle, allowing for simple application. Apply the plant food dry, shaking evenly over your container, raised bed, or in-ground garden. For containers, mix the fertilizer into soil at the time of planting or lightly work into soil for established plants. For in-ground and raised bed feeding, work into the top 1 to 3 inches of soil or apply directly over mulch if present. Once applied, water the product in to start feeding. One 3 lb. container of Miracle-Gro Shake 'n Feed Extended Boost covers up to 111 sq. ft.