"Jiffy 7" Pellet. 1 single pellet. "Jiffy 7" Pellet - 1 pelletCompressed peat that expands when water is added. Used for seed starting and cuttings.Jiffy pellets expand after you place them in water or nutrient solutions and are held together with a thin netting material. Used for seedlings and cuttings. Watch out though, they are made from peat moss and your pH will lower. Not good in hydroponic systems because of ... — Ships from Portland, Oregon USA...more.