The Azolla Bed 8×4×1 Ft. for Azolla Cultivation Green is a grow bed that is perfect for planting Azolla filiculoides. This grow bed is made from a mixture of red clay, peat, and sand. It can hold up to 1,000 gallons of water and is ideal for growing on in areas with high humidity. The grow bed is easy to use and can be created in a variety of sizes.