CocoLite Bricks come from coconut fiber and are a natural alternative to peat moss. They do not become hard like peat moss, and they rehydrate very easily to about 5x their size. They are environmentally safe, 100% organic, a natural soil aerator. bio-degradable, easy to use, and cost effective. Coconut coir retains water to keep your plants moist. It is excellent for starting seedlings and improving germination time. Plants root faster and spread through the fine coir substance easily.