Rootrainers - Rapid (32 Cell) are perfect for seeds, seedlings, plugs and cuttings, especially those needing straight root development. The 32-cell reusable modular system with holding tray and propagating lid allows easy spacing and inspection via the hinged openings. Rapid Rootrainers are ideal for bedding plants, salad and herbs, with a depth of 8.5cm (3in).