Potting soil and a peat pot all in one unit, with a small amount of fertilizer. Expands to 1-3/4"in diameter and 2-1/8"in height when water is added. Excellent for starting seeds like tomato, eggplant and peppers. Simply drop seeds on top and place in a warm area. Seeds will germinate quickly and can later be set out directly into the garden without transplant shock.