Protect your plants WITHOUT using poisons or pesticides! Advanced Nutrients Rhino Skin provides additional silica to strengthen your plant's stems, leaves and floral structures. A stronger plant produces bigger harvests and is better able to resist insect pests, fungal diseases and harsh conditions. Plants require silica to build cells — it’s the building blocks of your plants! Not only do they accumulate silica, they also store it as foundational support between cells. In fact, some plants contain up to 10% of their weight from silica. The problem is many nutrients and potting media do NOT supply enough silica to MAXIMIZE its benefits.