Miracle-Gro Shake 'n Feed Continuous Release Plant Food for Flowering Trees and Shrubs, 8-Pound (Slow Release Plant Fertilizer) For use on all flowering trees, shrubs and other acid-loving plants Iron helps prevent leaf yellowing (commonly associated with iron deficiency) Helps maintain deep, lush green foliage and colorful blooms throughout the season Feeds instantly to get plants off to a good start and provides continuous release feeding for up to 3 months and for beautiful trees and shrubs all season long Feeds up to 3 months