Walnut leaves

I just read that walnut leaves have a medicinal use and are sold to root buyers.
I'd like to know more about when to pick, dry, store and sell.

Just had a wind storm pass thru and have several branches down.
just

I dry sassafras leaves in the back of my 97 jimmy . Never messed with walnut leaves. I was told to hold them in trash bags when dry.

Does anyone know of a buyer for these or a price?

I see a list that has walnut leaves at 2.00 lb .

More details please---Site please.
just

Lots of buyers of walnut leaves out there. It takes a load of leaves to make a pound. Some buyers just want the leaflets stripped of the rachis (the part most people call the stem).