Good place to start with for information on growing bath loofah gourds and buying seeds:
If you’ve grown loofah sponge gourds, you’re probably wondering what to do with them all once they are ready to craft with. In this video, Trial garden manager Lindsay Del Carlo at Renee’s Garden show us when to harvest, how to prepare and make home-grown loofah into terrific bath and shower exfoliating scrubbers.
Check it out:
Getting sereous on loofah, there is a site just on loofah: luffa.info