Mammoth Starter Plugs make it easy to plant and grow. Plant seeds or clones in the pre-drilled holes, then water or mist, keep your humidity consitent, and transfer when ready. The 50-deep-cell tray offers 65mm of media; over 30% more than traditional trays. Mammoth Starter Plugs are made of a 50/50 mix of coco coir and sphagnum peat moss, providing ideal conditions for seeds or clones to start. No pre-conditioning is required – just plant and grow. The Mammoth Starter Plugs are highly compatible across all media and standard grow trays.