Hi Steve,
Before I go any further, let’s add that myrobalan seedling “cherry plum” has historical compatibility to: Asian plum, Euro plum, & all hybrid stone fruits: the pluots, aprium, and pluerry should be no exception.
Myro 29C has excellent historical compatibility for all stone fruits with the exception of peach/nectarine and cherry. Is myro 29C better than myro seedling = likely the answer is yes.
So let’s begin with Toka which is a hybrid of Prunus salicina (Japanese/Asian plum) & Prunus americana (American plum). I expect grafting onto Toka branches, these will have good to excellent grafting compatibility:
All Asian/Japanese plums
European plums = possible but not the best choice. While European plums will have some incompatibilty to Japanese plums, most should not. European plums will graft successfully onto American plum but there is definitely an issue for delayed incompatibility a decade or 15-years down the road. Be observant and watch for any swelling at the graft union and an a non-smooth transition from scion to stock plant.
All pluots/plumcots/Pluerry = very good.
Aprium = good to probably very good, however, be on the lookout for delayed incompatibility signs.
Apricot = 50/50. Apricots are 100% compatible to Asian plum however 100% incompatible to American plum. Watch the union should grafts be successful for future incompatibility.
In a nutshell Steve, all hybrid plums will do very well on roots of Prunus americana.
Damson & mirabelle I place them in the exact category as I would place all Euro. plums. Someone should correct me if I’m wrong. (see above: European plums)
Myrobalan seedling “cherry plum” & Myro 29C (clonal) are likely to be compatible with all stone fruits & hybrid stone fruits but not compatible for peaches/nectarines & cherries. Myro 29C is a more uniformly stable choice of the two rootstocks.
I think that should cover most of your questions. Using Toka as the example expands the information for a lot of combinations.
I think if you want a rootstock for all the things you asked about in your original post, Prunus persica is the best way to go but be aware that “cherry plum”/myrobalan will never graft successfully to it. Everything else will. Lovell of course is a Prunus persica rootstock.
Citation (P. salicina x P. persica) should be regarded as having all the same compatibility of peach. Myrobalan 29C or Myrobalan seedling will offer equal compatibility however with the exceptions that there will be none compatibility to peach/nectarine (add on information for Myro comparison to Citation rootstock).
Lastly, you’ll have to discern which rootstocks are best for your climate.
Now to what will graft successfully to your Satsuma (Prunus salicina) Asian plum:
Japanese/Asian plum of course 100%
Apricot = 100%
European plum = good to very good but watch the union for delayed incompatibility.
Pluot/Aprium/Pluerry = very good
peach/nectarine = good
Now compatibility of your Flavor Supreme:
All pluots/all/pluerry/aprium
Asian plums = all
European plums = good but watch for delayed incompatibility. Should not be a problem though I don’t believe.
Apricots = all
Myrobalan seedling “cherry plum” & Myro 29C (clonal) are likely to be compatible with all stone fruits & hybrid stone fruits but not compatible for peaches/nectarines & cherries. Myro 29C is a more uniformly stable choice of the two rootstocks.
Best,
Dax
P.s. I’m tired, it’s nighttime, so I hope I didn’t overlook something.