Jiffy 36mm Windowsill Greenhouse 12- Plant Starter Kit A slender design makes it easy and convenient to use. Contains (12) 36 mm Jiffy pellets Pellets expand to form pot and soil all in one. Pellets are made from sphagnum peat moss which is a rich,high quality growing medium. Great for starting seeds for flower and vegetable gardens Clear plastic dome retains heat and moisture which creates the perfect seed starting environment Pellet greenhouse starts 12 plants from seeds or cuttings Pellets expand to form pot and soil all in one Great for starting seeds for flower and vegetable gardens Pellets are made from sphagnum peat moss, a rich, high quality growing medium Clear plastic dome retains heat and moisture, the perfect seed starting environment