Sponges don't grow on trees... or do they?

Lemons, mandarins, passion fruit, yes. Papayas, yes. Giant avocados, yes. Sponges? Surely not!
BUT THEY DO.
You can use them for washing up, cleaning or in the bath/shower.

Mostly-peeled sponge.

A sponge GROWING ON A TREE. The things at the top are papayas.

Avocados. These are fairly small ones.