Planted a small dormant Saskatoon serviceberry (Ameranchier alnifolia) 'Obelisk' (aka 'Standing Ovation') in late fall/early winter of 2016 in a semi-shaded spot on the north side of Dallas, Texas. A gamble, I know, setting it up for heat beyond its native range. But willing to take a chance on an experiment. Leafed out beautifully early spring, but main (grafted) stem did a quick wilt and died well before any serious heat after only two or three weeks with the leaves out. Seemed like graft failure. Here's what it looks like today (a year later):

I re-potted it, stuck it in irrigated space among our other potted divisions and cuttings, and the root-stock survived. Leaves on the healthy shoot appear to be Ameranchier, so guess is likely species A. alnifolia root-stock?

Have a credit from the nursery, but they've been out of stock on the cultivar. Would it make any sense to just use the root-stock plant to see if A. alnifolia can survive well in this location? Figure two three years would provide a better indication and I would have either given up or found another source for the named cultivar by then. Just don't want to waste the time if the root-stock is unlikely to be reasonably representative. Would appreciate any inputs.