Combination fertilizer and nutrient spike Helps enhance citrus development Packed with key elements that are commonly deficient in citrus trees Highest quality nutrients Feeds at the root zone for effective uptake by the feeder roots Power Spike for Citrus Trees is a combination fertilizer spike and essential nutrient spike. Specifically formulated to effectively feed and fertilize all types of citrus trees and treat their common deficiencies like Magnesium (Mg), Manganese (Mn), Zinc (Zn), Iron (Fe) and Boron (B). The spikes are designed to pack more feeding and nutrient power than other common fertilizer spikes. This combination helps your citrus trees restore from common element deficiencies and restores them to healthy growth and fruit development. Power Spike for Citrus Trees release the fertilizer, key elements, and nutrients at the root zone for consistent uptake by the feeder roots.