Wonder Soil is a highly compressed planting medium that expands about ten times its original size when you add water. It contains a water-retaining polymer that expands to absorb water, slowly releasing it as the soil dries, improving survival rates of transplants. Made from sterile coir, it is nutrient-free (we recommend using it with a complete water-soluble fertilizer).
It comes in two convenient formats: a container of 18 expanding wafers, and an economical brick. One wafer expands to fill a 4" pot, and one brick expands to over 2 gallons. Not for use with food plants, Wonder Soil can be used alone or mixed into potting soil to improve retention of water and nutrients.