How can I effectively harvest cucumber seeds from my garden for future planting?

To effectively harvest cucumber seeds from your garden for future planting, allow the cucumber to fully ripen on the vine until it turns yellow and the skin becomes tough. Cut the cucumber open and scoop out the seeds. Rinse the seeds in water to remove any pulp, then spread them out to dry on a paper towel for about a week. Store the dried seeds in a cool, dry place until you are ready to plant them in the future.