>>A prune tree? Who knew? I always thought prunes were dried plums. <<
Prunes are dried plums, but not just any dried plum is a prune; prunes are freestone varieties grown for drying, and have their own flavor profile. Eating plums are generally clingstone varieties.
Prune trees are just plum trees suitable for producing dried prunes.
To complicate matters, there’s also gages, as in ‘Greengage Plums” (my own favorite.) and damsons. It is never simple!
About as bad as apples or squash. LOL
I think we used to call them Italian prunes(plums)