Soil Moist is a non-toxic polymer that acts like a sponge when mixed with soil. It holds over 200 times its weight in water and releases it slowly over time. Soil Moist reduces transplant shock and lasts for several seasons. This organic "agro-polymer" absorbs water much like a sponge. Used as directed, it can double the amount of water retained by soil. Totally biodegradable and non-toxic.