Jobe's organics spikes for fruit and nut trees feature a convenient spike form. These organic fertilizer spikes, specially formulated for fruit and nut trees, help build a nourishing environment that promotes beneficial microbial action where need it most at the roots. This in the ground feeding is the most efficient delivery system for organics. The spikes improve long-term soil quality by promoting beneficial microbial growth. The pre-measured spikes make for fast, easy and mess-free fertilizing. For finest results, apply in early spring and late fall.