Fruit Trees Alive! Fertilizer Spikes gives plants the nutrients they need for healthy growth in an easy-to-use, stake form. Simply drive the stakes into moist soil (water before placing spikes if soil is dry), ensuring they are equally spaced at least 3 feet apart around the dripline. Never place the spikes closer than 2 feet from tree trunks. Hammer the spikes to ground level using the plastic pounding caps provided. The spikes are formulated using the Fruit Trees Alive! formula.