apple grafts onto saskatoon two years old

apple grafts onto saskatoon two years old. I did these as an experiment with left over scion wood in july. surprisingly they’re growing ok, but they’re low and vulnerable to deer and rabbits so i’ve lost some. amelanchier alnifolia, or seevice berry, known as saskatoon grows wild here and has some reputation as a pear rootstock, and now I’m discovering a dwarfing apple rootstock. if it survives for 3 or 5 years and fruits that would be a success for me, at minimum it’s a way to grow out scion wood. #grafting