Reusable greenhouse Great for seed raising Easy to use all year round Gives your plants the best start in life Jiffy Peat Pellet Greenhouses offer a complete propagation solution with 36 x 36mm peat pellets and a plastic greenhouse that provides warmth and humidity to aid rapid growth of seeds and cuttings. Jiffy Peat Pellets are made of compressed peat, wood pulp and coir pitch that expand with water to provide the ideal growing medium for seeds. The pellet is both the pot and soil at the same time. When used in conjunction with the greenhouse your plants get the best start in life. Plant the pellet and all when seedlings are large enough to handle. This will prevent transplant shock by not disturbing the plant's fragile root system.