Del, I have no experience with P americana as a rootstock, but it should do
well under the hybrids. Were these well established roots in pots or
recently dug when you bench grafted them? I have grafted Waneta, Gracious,
Hanska, and a couple others in the past on Myrobalan with good luck. Best
rootstocks for plums in my opinion are Myrobalan and Myro 29C; peach, if your
soil conditions and climate permit; Marianna 2624; and the St Julian A
clones. I liked Pixie in the past but don't know a source now. I'm trying
Brompton plum this year and have had very good takes and early growth on
several European (P. domestica) cultivars.
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