Organic Plant Starter Cubes Root Riot Cubes are made from composted organic materials and recommended because of their large spongy texture, which ensures perfect airiness and humidity. This recommended temperature in combination with the seeds or cuttings ensures fast and healthy root growth. Root Riot Cubes are specially impregnated with micro nutrients for feeding the young plants and are already supplied moist. If the Root Riot Cubes have become too dry, you can easily wet the cubes again by placing them in a bowl with lukewarm water. Put them back in the container and let them drain well before use. The Root Riot Cubes should be spongy and moist, not soaked. Unused Root Riot Cubes should be wrapped in plastic to prevent drying out. Ideally, the Root Riot Cubes are at room temperature. If you store them at a lower temperature, let them come to room temperature before use. A Root Riot Tray contains 24 cubes.