This handy greenhouse kit contains fifty 1-3/4" square cells in Jiffy-Strips, as well as an 11" x 22" reusable tray and dome made from recyclable plastic. The dome helps maintain humidity and temperature for better germination and healthier seedlings. The pot strips are 100 percent biodegradable and made of Canadian sphagnum peat moss and wood pulp. Peat pots are great for starting both flowers and vegetables for your garden. Pots can be directly planted into the soil to reduce transplant shock.