Collards have an optimal temperature range from 45-85 degrees, and if kept in full sun and moist, you can harvest in about 80 days. They like their soil to be moist, but not waterlogged . Plant in the first part of spring to harvest in summer. Plant in 6 inch intervals. Cut the plant at ground level to harvest the entire plant, or cut the outer leaves when they reach 10-12 inches and maintain the smaller plant inside to continue growing. If you are looking for more collard seeds, take a look at www.edenbrothers.com they usually have a good selection.