Soil Moist will reduce plant waterings by 50% and last several seasons. It absorbs water and releases it into the soil as it is needed. Soil Moist stores over 200 times its weight in tap water, releasing a steady supply of water as your plants need it. It is a polymer designed to reduce plant waterings. It absorbs water like a sponge; when the soil dries, the stored water is released into the soil over an extended period of time. Safe for use on all plants.