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 Standard Pellets are 1-3/16" dia x 1 1/4" ht (expanded). For sustainable alternatives, see also our Coconut Fiber Pots & Pellets.
These do a very good job at getting seeds started. I have read some reviews that say the netting is made out of plastic, and some that say some are made of a cotton/biodegradable fiber. So, to be safe, I just cut away the netting before planting in the ground. Seedlings sprout quickly, but I don't know what fertilizers are put in with the peat so it's hard to call it organic. Also, the roots emerge fairly quickly, sometimes before the seedling peeks out, so they may have to be transplanted into bigger containers sometimes.
Overall, I'm happy with them, they're easy to use, don't need any special tray, and give me high germination rates.