Palm Tree Fertilizer Spikes have proven themselves unmatched in their ability to restore and hold healthy green growth in all established and transplanted Palms, and those with yellowing manganese, magnesium or potassium deficiencies.Palm Fertilizer Spikes are a fast, efficient, long lasting method of fertilizing all Palms. Palm Spikes are applied next to the root ball, and slowly release nutrient to the Palm over several months. Depending on climate, annual or semi-annual applications are all that are necessary to maintain healthy green beautiful Palms.