Pollinating American Plum

Hi,

I might have screwed up! In planning our native food garden, I assumed our Western Sand Cherry (prunus besseyi) would pollinate our American Plum (prunus americana) since I read sand cherry can pollinate plums, but now realizing it might have been a rookie mistake. Further reading makes it seem like we need another American plum to get any fruit. Do you know of any alternatives? I know p. americana will pollenize hybrid plums but not the other way around. I found the attached Pollination chart that shows what the cherry will pollinate but doesn’t include American plum on the chart. Does anyone have something similar that does?

We really don’t have space for another tree but I can take out the elderberries if need be. My hubby really wanted these… I don’t love the taste but he likes them (tried at a demonstration garden).

Thanks!

I am considering adding an American plum to my yard, and my understanding is that it is self-fertile.