A sponge like material, all natural soilless grow plugs are made of composted tree bark and organic materials. Biodynamic plugs are perfect for seedlings or cuttings. Transplant plugs in soil or soilless hydrogardening applications. Ready Gro™ Plugs are made through an advanced proprietary composting method and contain natural beneficial fungi from this advanced composting biotechno- logy. Seedlings and cuttings grown in these plugs can be transplanted days ahead of plants started in other media. They hold perfect air to water ratio. Ready Gro™ Super plugs are biodegradable and 100% organic. Sold in bags of 100.