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 & not from the sea! Why just grow veg when you can grow other household staples too? The Luffa is the perfect eco- friendly & sustainable home-grown pan scourer or bath sponge. The Luffa is a genus of subtropical & tropical vines in the cucumber family & it can also be cooked & eaten like courgettes! Eat them when they are young & tender (up to 15cm). Luffa plants grow like cucumbers & need a greenhouse, thriving in full sun & well drained but moist soil. Reaching heights of 201-250cm (79-98") & spread 41-50cm (16-20"). Harvest late August-October.