Biodegradable Peat Pellets made of Canadian sphagnum peat moss permit abundant aeration, uniform drainage and easy root penetration. Peat Pellets are made with small amounts of lime (balances pH) and fertilizer (to help seedlings get started). These compact pellets swell up when water is applied to form round pre-dibbled growing pots. The peat is held together by a biodegradable mesh net and can be transplanted with the seedling when roots push through the netting. Transplant shock is greatly reduced because the entire pot can be planted without disturbing the roots. The Large Pellets are 1-11/16" dia x 1-11/16" ht (expanded). For sustainable alternatives, see also our Coconut Fiber Pots & Pellets.