There are two main types of luffa: ridged (Luffa acutangula) and smooth, or common (L. cylindrica).
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Like most gourds, the vines are vigorous (translation: absolutely ridiculously rampant plants that are trying to take over the world). You have been forewarned. Give them a fence or something very sturdy to climb.”
If you want to grow your luffa gourd into a sponge, you’ll want to allow them to mature. This may mean they can get up to two feet in length! If you live in a warmer area, the fruit will ripen and also dry on the vine.