A comprehensive tree and shrub fertilization program should include both early spring and early fall application program. It is recommended that lower nitrogen, higher phosphorous and higher potassium analysis is used for a fall application. A 1:2:2 N-P-K ratio in the fall improves the stress tolerance, winter hardiness and increase carbohydrate storage. A good fertilization in the fall will help a struggling tree to flourish next spring. A spring application ratio of 1:1:1 for deciduous and 3:2:1 ratio for evergreens is ideal.