Jiffy Peat Plugs are very good for starting cuttings or seeds. Just place the pellets in warm water to expand to 1.5" tall. Pull the netting back on the top of the plugs, and add a seed or cutting. Water lightly every few days. When roots appear out of the plugs, you are ready to transplant to your favorite medium. Jiffy Peat Plugs are very good for starting cuttings or seeds. Just place the pellets in warm water to expand to 1.5" tall. Pull the netting back on the top of the plugs, and add a seed or cutting. Water lightly every few days. When roots appear out of the plugs, you are ready to transplant to your favorite medium.