Compatible with all Awesome Plant models & AeroGarden hydroponic growing system Better Germination: sponge’s unique microporous structures enhance moisturizing ability and balance oxygen and water Better Yields: healthy root development leading to a robust plant and higher yields Easy to Use and Transplant: soak in water and put into the grow basket, then insert into hydroponic garden. Transplant into soil when the plants are too tall 30 Awesome Plant Grow Sponges included Awesome Plant Grow Sponges (30 Pack) includes 30 pieces of grow sponges, 1 user guide. Compatible with all Awesome Plant hydroponic growing systems and AeroGarden hydroponic gardens. Awesome Plant sponges feature unique microporous structures to enhance moisturizing ability, leading to better germination, healthy root development and better yields. Pre-dry sponges provide no pest, no mess, soil-free grow experience. Use with Awesome Plant models or most of other hydroponic growing kit for reliable germination.