If you can wait till it starts to yellow then you can pick and dry inside. It does not necessarily HAVE to dry on plant if your weather conditions get dicey. I bet if NEED be you will have some success picking mature green Loofas's. Most exciting your garden harvest!!!!thanks!! Several of us were interested in growing luffa bc of @TropicalBabies! And a few of us managed to grow some, but not sure how successful. I’m not sure how successful mine will be either -I need to look up if I let it dry on the plant or bring in to dry.And I have several birdhouse gourds and need to figure out those too.