Orcon EARTHWORMS Pre-Paid Certificate (½ cup, 150-300 Worms in various life stages) - Case of 5Case of 5 Red wiggler earthworms, Eisenia fetida, burrow 24 hours a day, aerating the soil to allow easier root growth and improve water retention. They also speed up the decomposition process in cold composting. Earthworms are shipped as bed run, which means there will be a variety of sizes and life stages in each shipment. Gardeners simply mail in the postcards or register online to have their insect orders shipped to their doors at no extra cost.