Does any one know if it is possible to graft peaches/plum/sweet cherry etc. ie. members of the Prunis family to Sour cherries? I have a couple sour cherry trees/bushes and wanted to graft some other fruits to them. I know they are all in the same family so it should be technically possible but there doesn't seem to be much research info about this and people either haven't tried it or have expressed hypothetical compatibility issues when grafting to sour. Does anyone have any insight?