Dishcloth gourd, sponge cucumber or luffa is a very common plant in Japan.
They are very strong and can grow anywhere.
You probably have seen a dried one as a body wash sponge.
In Japan, we plant them in elementary school and make the sponges.
We also make facial lotion and it soothes your skin.
Lately in Tokyo, people use them to create a curtain over the windows to make shades, this way they can save energy and cost. What a great idea they've got!
I would love to try that one day when I have a house.