Toka plum on wild chokecherry grafts

Toka plum on wild chokecherry grafts. This one hybrid variety had the best compatibility and put on 3-4ft of growth last year. I’ve left them to overwinter with budding tape in place to add a little insulation from sun scald, hoping these make it through the winter. later this spring I’ll be trialing Toka and a few others as an interstem on many more prunus varieties with the goal of finding compatible combinations for zone 3 hardy prunus to graft onto the prolific choke cherry around most of Canada. #grafting