Miracle-Gro Shake 'n Feed Continuous Release: Citrus, Avocado, Mango Plant Food, 4.5 lbs Use on new or existing in-ground citrus, avocado and mango trees Contains added potassium, magnesium, sulfur and iron to improve common nutrient deficiencies Feeds up to 3 months Prevents overfeeding or burning when used as directed Takes the Guesswork Out of Feeding