found this potted nadia plum

found this potted nadia plum, completely forgot out it, rooted from softwood and it's been in this gallon pot for two winters. happy to see it survived, nadia is a sweet cherry x japanese plum (salicina x avium) hybrid, and I didn't think it would be cold hardy here... wonder if being on its own roots helped. surviving -40 in a neglected pot, barely watered and not particularly winterized or covered means it's tougher than I thought.