Mammoth Microbes Silica, 2.5 GallonThe newest highly concentrated elemental silicon additive to hit the market! MAMMOTH SILICA (SI) will enable plants to grow MAMMOTH STRONG. Silica helps plants improve cellular development and shows to help increase the production of cell walls. Think of silica being the mortar that holds bricks or, in this case, cells together, creating a more sturdy framework for the plant. This framework allows cell walls to work more efficiently and be more