Power Si Granular is the only, first of its kind slow release granular formula containing stabilized silica, and other proprietary ingredients. These ingredients play a key role in releasing locked up nutrients from the soil Power Si Granular provides a stable matrix to keep silica in an active state, which is available to the plants for an extended period (up to 30 days after application). Naturally generated Silica is available to the plant but only for a very short period of time. It quickly polymerizes, making it non plant available. This highly concentrated Silica promotes rapid root growth and accelerated seedling growth. Commonly used on Grapes, Berries, Raised Bed Gardens, Fruit Trees, and your favorite plant!