I had the exact opposite experience. . Only the scion from California failed. Maybe I just got unlucky, but I’m a fairly experienced grafter at this point. Scion from 2 sources on the west coast failed. The only difference is those scions were obtained earlier. So if it were me I would not count my chickens before they hatch. I myself will no longer obtain scion from the west coast. Maybe it’s my fridge, my location, or the sources I have used, or whatever? I have had success in the past, but failure rate has always been high. For other scion from the PNW, NE, and MW I had a 70% success with peach. So I can say with confidence it was not me. 70% is a damn good rate. If it walks like a duck…
Part of it may be how long I have to wait here in MI. I cannot really start grafting till about May 1st. The best time to graft here is at bloom according to local experts. I found this to be very true too. I get 95 to 100% with plums at this time. Last year I grafted plums twice once on May 1st and again on May 15th. I only lost a couple on the 15th, none were lost done on the first. I’m done experimenting, I know when to graft here now. If it’s not broke, don’t fix it. My guess is sap flow is highest here at bloom. Temps varied year to year and seem to have less effect on grafts. Maybe some, but not as important compared to when sap is flowing best.
I added this info not to dispute what Scott said, no doubt it has worked for him. I’m just relaying my experiences as the more info the better. It may be that the Midwest environment here in Michigan is so different from the west coast I was doomed no matter what. It appears if in the NE you have a better chance. I’m in zone 6 that used to be zone 5, and we still have zone 5 numbers. I’m totally confused as to why they changed it? So maybe it is a zone thing? I have had no problem with bare root trees from California, almost all my trees are from California. Arctic Glo, Indian Free, the Nectaplum etc all came from Bay Laurel, so I can’t say why they had no problem? Zero died.
I added last year
Indian Blood Cling
Old Mixon Free
Looking for June Pride if anybody can help?
I do think like Scott said you should be OK, you’re in zone 7 which me being in 6 is why I had bad luck. Not sure? Anyway how it works out is important, so update this thread next summer and please let us know.