Luffa (aka Loofah) is a very practical and useful gourd which can be used for bathing, filtering and cleaning. It is shaped like a cucumber but is larger, at 1-2 feet in length and 4-5" in diameter. As it ripens it develops a network of fibers that surround many flat, blackish seeds. Can be grown on a trellis or fence. Luffa - 120 days - 1 to 2-foot long cylindrical fruit - fast growing. Also know as the vegetable sponge, the dishrag gourd, and Chinese okra. M..