I had a couple of large pawpaw trees in the backyard of the house I lived in when I went to University of Michigan (and later lived for a while after graduation

I had a couple of large pawpaw trees in the backyard of the house I lived in when I went to University of Michigan (and later lived for a while after graduation), and I saved a lot of seeds. They pretty much all germinated and I'm in the process of growing a bunch more in my new place a few towns over and with a lot more acreage. There are now quite a few growers and professional greenhouses with trees available, so you don't have to wait 20 years to see fruit. I bought a couple 5 year old trees and I'm giving them one more season to finish establishing before I actually let them fruit, but they did produce blossoms last year and if I'd wanted to pollinate them, I could have had a few hands. Usefully, they are relatively unattractive to the huge and very frustrating deer population in this area, so they're doing better than the tart cherries I spent a pretty penny on.