Neem Cake (also known as Neem Seed Meal) is a natural fertilizer that is the by-product derived by cold pressing neem tree fruits and kernels. It may reduce soil alkalinity during decomposition and may be compatible with soil microbes. Neem cake may help improve soil texture, water holding capacity and soil aeration for better root development. Neem cake can be mixed with bat guano and other organic fertilizers to promote the slow release of nitrogen.