Fertilizer for trees and shrubs is delivered directly to the root system as a liquid soil injection via a feeding probe. Greene’s Tree & Garden uses Plant Health Care® for Trees fertilizer with an analysis of 11-22-22 N-P-K (nitrogen, phosphorus and potassium) for trees and shrubs. For perennials we use Flower-tone® fertilizers. Also, when needed, lime is applied to achieve specific pH and micronutrients such as iron and zinc are applied to address deficiencies. In addition to fertilization plants should be planted in undisturbed natural or amended soil, not in fill. They should be planted at the soil grade, receive 2 inches of water per week and be mulched properly.