If you are talking about Physalis alkekengi, Chinese lantern, please, please, be sure to tell your customers to KEEP it in a pot. It can be extremely invasive, as I have discovered, and very difficult to get rid of if you plant it in your garden. I dont know if this is true for your zone but here in zone 7b, it is Trouble with that capital T. Other than that, I wish you good luck in your venture, and what is toothache plant anyway?

Yes, I will definitely be putting a big warning sticker not to plant them in the ground.

These are the toothache plants. I think they go by lots of different names.

Here is a link that might be useful: Toothache plant