Luffa Seeds Grow your own sustainable luffa sponge! You’ve probably heard of or used a luffa sponge in your time but, did you know it was actually made from a vegetable? Luffas come from plants similar to a climbing courgette and not from the sea! Why just grow veg when you can grow other household staples too? The Luffa is the perfect eco- friendly and sustainable home-grown pan scourer or bath sponge. The Luffa is a genus of subtropical and tropical vines in the cucumber family and it can also be cooked and eaten like courgettes! Eat them when they are young and tender (up to 15cm). Luffa plants grow like cucumbers and need a greenhouse, thriving in full sun and well drained but moist soil. Reaching heights of 201-250cm (79-98") and spread 41-50cm (16-20"). Harvest late August-October.