beach plum, prunus maritima

beach plum, prunus maritima. native to the east coast, supposed to survive zone 3 winters. these ones made it through last winter under the snow. it’s a prunus species that i’ve never seen in cultivation or offered at garden centers in our area, and exactly kind of plant I want to propagate. maybe eventually make some crosses with. it seems to want to grow like a cherry plum as a bush.