TreeHelp Complete Palm Fertilizer Spikes Specially formulated to provide all of the nutrients a palm tree needs to thrive. They contain all of the important nutrients palms need including Potassium, Manganese and Magnesium. Specially formulated to provide nutrients in a way your palm tree can easily absorb. TreeHelp Palm Tree Maintenance Spikes last for up to 12 months. The spikes can be used for established palms, newly planted palms and potted palms.