Whether you choose to eat young luffas, or hold fruit on the vine to mature for making your own luffa sponge, you will enjoy experimenting with this unique vegetable. Allow the luffa sponges to dry completely in the sun and make certain that sponges are completely dry before storing or mold may grow on any remaining sap. Dried luffas can be stored for years as long as they stay dry and dust free. These natural sponges are extremely durable and will last for years!