beach plum, prunus maritima

beach plum, prunus maritima. I have a small bed started from seedlings, and they've survived two manitoba winters, the plant is possibly zone 3 even though we're outside of it's native maritime range. so it's cool to have this species growing, and happy to see that it roots like a cherry plum. I guess my plants have been pruned low and were covered by snow last winter, so still need to really test these above the snow to know how it's going to hold up to -40