These rambling, strong growing vines can grow to 6 m (6.5 yd) or more in length. A structural support is required for the vines to grow on. Note that the chance of producing mature fruit in Zone 5a is very slim. For someone in this growing zone looking for a real challenge, you have found it here! The intrepid gardener will need to resort to their tool box for such techniques and structures as: pre-planting soil solarization to advance soil warming, using raised beds, soil modification by adding large amounts of organic matter, wind shelters and both early and late season cold temperature shelters. Even after doing all that, successfully growing mature luffa in Zone 5a should not be considered in any way as guaranteed!