I’m jealous .I managed to collect two of these today, they were suckers growing about 15 feet away from the parent tree. They did have a fair amount of fine roots. I’m hopeful they will make it, I have had good luck with the suckers on the past.
I think I just figured out the mystery. It’s a Prunus cerasefera “Krauter Vesuvius”, a flowering plum.well considering where you live . Looking at the flowers especially. I’m at a loss to come up with a reason not to say . Prunus serrulata . Japanese flowering cherry . At end of the day why would it not be
I’m still waiting on leaf out but I’m pretty sure they are purple.Not saying your wrong . We have them here as there cold tolerant . You did not mention the foliage . All the ones here are purple or at least not green . And the bark don’t look correct . Again compared to trees here . . In general cherry plum is planted where Japanese cherry will not flourish . Run a single full size leaf on a neutral background thru a good plant ID app . Or pics here to compare to info on each
Again it depends on location . And think about source of plant . Cherry/ plum is more cold hardy . And used as such . If the leaves are purple very good indication . Not sure about Japanese cherry . But plums will cross pollinate . Cherry plum is a fav food of birds so if the plants . Are propagated in the wild . Difficult to say what exactly cultivar they are . But pink flower combined with purple leaf . No 1 is cherry plum . Of some sort . Landscape tree mist likely a cultivar . Propagated for those particular flowers . All the ones here seem very similar . Bark is a lot more grey then yours . But most likely a more cold hardy cultivar personally I think they are under used as bonsai . Fast growing tough tree . Very showy flowers . The purple foliage is a like or hate thing for mostI’m still waiting on leaf out but I’m pretty sure they are purple.