Ecotone Hydroponic Grow Mats from Sustainable Seed Company. Microgreens. Wheatgrass. Seed sprouting. Ecotone Hydroponic Grow Mats are made from 100% post-consumer plastic bottles and can be recycled again after harvest. Fits 10‚ x 20‚ microgreens trays and can be cut to fit any 10‚ x 10‚ tray or smaller. Ideal for both large and small microgreens and sprouting seeds such as arugula, clover, pea, radish, and many more.