I don't know if this counts. I had a Dolgo seedling tree that held onto a bunch of crabapples until the new growth pushed them off this spring. This summer I noticed some seedlings coming up beneath the tree's canopy and put old fence wire around them. Today I counted 14 crabapple seedlings growing there. They range from a few inches tall to over two feet tall. I'll probably let them grow another year before I do something with them.