Does anyone know if Prunus armeniaca, or more specifically Prunus armeniaca mume, is more closely related to plums, apricots, or peaches? I would like to know if I could graft a Prunus armeniaca mume onto a Prunus domestica or Prunus cocomilia rootstock, since I already plan on growing plums.
Prunus armeniaca mume is the most related to apricot. Most of the time will work long term with any peach. Most of the time with St julien plum (prunus instititia) which St julien is very closely related to prunus domestica. So, even though it's not common practice I guess maybe over 50% chance of a long term graft to prunus domestica. I mostly am going by some research from what I remember trying something similar last year.
F.Y.I. I’ve had some success with rooting Ume cuttings from winter pruning in the Portland area. Crudely pushing the sticks into ground that had been previously used as a composting and then a sawdust holding area. January pruning. About 80% take. My Cultural practice is bad - after allowing soil to dry in spring to cracking- still had about 50% survival. I now try not to prune anywhere near a rainy season. My Ume is the white blossom not pink, and does not appreciate the wet. 
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