MontanaGrow Silicon Amendment - 25 lb poly bagMontanaGrow Silicon Soil Amendment began more than 30 million years ago, when ash from ancient volcanoes was compressed into amorphous volcanic tuff. This tuff is a unique source of silicon that becomes available to plants once it is added to soil. This smooth organic powder provides macro and micro nutrients and can improve soil texture, all of which will give you stronger, healthier plants with bountiful yields. Key Plant Benefits: Improved cell