CITRUSGAIN 50lb Bag, Citrus Fertilizer Specially formulated for Citrus Plants & Trees Applied directly on top of soil & mulch Citrus like orange, lemon, lime, avocado, mango, other fruit trees and plants need ample amounts of nitrogen, potassium, magnesium, manganese, iron, copper, zinc, sulfur, other macronutrients and micronutrients to product strong growth, high yield, fruit size and juice quality. CitrusGain is the easiest way to ensure plants have these meaningful elements. It is formulated specifically for citrus and other plants having similar nutrient requirements.