photo 1+2 are prunus americana from different sources

photo 1+2 are prunus americana from different sources, 3 is canada plum, last one is a cherry plum. all collected locally so the trees are fully hardy to zone 3 -40 winters. #plums I’ve been offering just the first one on our seed shop, considering adding the others. canada plum is the most rare so if I do offer the seeds they’ll be limited, mostly I want to grow those seedlings and even graft them. The fruit was collected from remote wild stands with almost no chance of being hybridized. I bet the cherry plum seedlings would also make good rootstocks.