If your pumpkin vine has performed well for you this year, it is worth saving seed from one of the best pumpkins as the plants that grow from collected seed will have already adapted to your soil and climate conditions, and pumpkin seed is very easy to save. After harvesting, store the pumpkin for 2 or 3 weeks to make sure the seeds are fully mature. Then cut the pumpkin and scoop out the seeds. Place the seeds in water and rub them to remove the pulp. Viable seeds usually sink to the bottom of the container. Rinse the seeds well, then spread the seeds on a sheet of paper to dry where mice can’t get to them. After two weeks, place seeds in a labelled jar or envelope and store in a cool, dark, dry place.