What varieties of trees are compatible for grafting with cherries other than other cherries? Plum, what else?
IIRC, anything from the "Prunus" family, which includes plums, apricots, peaches, nectarines, and almonds as well as cherries.
My personal rootstock preference is for "Mazzard" but that may depend on your soil type.
The link I revised the Mazzard mention to point to does note some specific cultivars having issues with specific rootstocks other than Mazzard, which probably means that some other in-family members may not actually work with at least some cultivars. But generally, they all at least could work.
Ahh you also like grafting nursery stock? I find Mazzard does well in compacted clay, which is why it's what i use 90% of the time. I think some plums can be grafted onto a cherry, but not most other stone fruit. I think plums have the greatest compatibility in that you can graft the other stone fruits to them (and some cherries). Feb 24, 2016 at 20:22