100% Organic and Biodegradable. Expands to 5 times its size! The perfect, environmentally friendly mix for good germination. Natural water retention and drainage capabilities make this premium grade, peat-free coconut coir mix ideal for seed germination. Specially formulated to allow soil to stay cool in hot weather, warmer in cold months and moist all year around. Just add warm water directly over the block and allow to soak. It absorbs water like a sponge. 8 quart block.