Fertilize trees and shrubs with N-P-K (nitrogen, phosphorus, and potassium). We also use bio stimulants to aid in nutrient absorption and to provide the proper environment for beneficial microorganisms in the soil.
In general, 2lbs of nitrogen per 1000 square feet annually is needed. Trees in the forest get this through decomposed leaf litter and other woody debris. Trees and shrubs in lawn areas need supplemental fertilization due to location. Fertilizer is delivered directly to the root system as a liquid soil injection via a feeding probe. New plants should be installed at soil grade, receive 2 inches of water per week and mulched or wood chipped properly.