Hold up to 50 RapidRooter plugs with the RapidRooter Plug Tray (RapidRooter plugs included). RapidRooter is a unique seed starter plug derived from peatmoss. The air-to-water ratio within the plug matrix promotes root growth. For best results, soak plugs in water or mild nutrient to re-hydrate. Place seed or cutting in the center hole of the plug. Keep about a quarter inch of water in the bottom of the tray to maintain plug moisture. When roots appear, the RapidRooter plugs are ready to be transplanted.