Formulated for All Types of Trees & Shrubs: The 8-8-8 formula — 8% Nitrogen for vigorous plant growth and rich colors; 8% Phosphorus for healthy fruiting and flowering; and 8% Potassium for strong roots — in these fertilizer plant food spikes provides ideal general nutrition levels for all types of deciduous, coniferous, decorative, flowering, and fruiting trees and shrubs.