For healthy trees and shrubs, choose Miracle-Gro. This Shake 'n Feed fertilizer is specially formulated for flowering trees and shrubs and acid-loving plants such hydrangeas, lilies of the valley, azaleas, and rhododendrons, to name but a few. This plant food has the added benefit of being made up of organic ingredients like bone meal, feather meal, earthworm castings, and kelp. Just one application is enough to feed your plants for up to 3 months. This product is backed by the Scotts No-Quibble guarantee.