For the american chestnut weenies….
There are pure seedlings available from TreePro in IN. I *think* I know of their seed supplier and if I’m correct he’s legit. I ordered 4 more seedlings today. It’s rare to find pure seedlings/seeds available without being on waiting lists.
They will eventually die, but if you get a few there’s a chance you could get nuts from them one day. Plus they’re simply just a pretty cool tree.
https://www.treepro.com/products/pure-american-chestnut-seedling