10 Large Fresh Seeds w/Instructions A luffa sponge is often found in a bathroom as they have great exfoliating (removal of dead skin cells) properties. Did you ever wonder where they came from? Luffa sponges aren't a product of the plastics industry, nor are they a sea sponge; which is an animal. Luffa is a plant; so its an environmentally and vegan friendly product - and whats more you can grow your own! Makes a fabulous gift or craft item for soap making Luffa is an annual, closely related to the cucumber. It is a strong climber with large yellow flowers and should be trellised in order to keep the heavy fruits off the ground. The immature small fruits can be eaten and the seeds may be roasted. They do best in tropical and subtropical areas; but can be started off inside to avoid frosts. They will require some watering if you're in a particularly dry area. They produce best in full sun and take 6 months to mature to a point of harvesting - which is just after the plant dies off. Collect the seeds for the next season. Gourds must be very over-ripe before harvesting seed. Zones 7-11