Loofah comes from the loofah gourd of the Cucurbitaceae family, and is the only plant known that can be raised and used as a sponge. It grows annually and produces vines from 12 to 20 feet high, with dozens of gourds per plant. When the gourd is fully mature, the dried outer shell can be peeled off to expose the fibrous sponge, which is actually the skeleton of the fruit of the plant.

Loofah sponges are useful in exfoliating and invigorating skin as well as washing and scrubbing dishes. Loofah sponges should be moistened before using on your skin unless a sandpapered or burned look is desired. The sponge is very appropriate to use if you have rough skin around the knees for some reason.