Grandpa's European Prune

Prunus domestica 'Grandpa's Prune'

Granpa's Prune is a Stanley type that seems to have added resistance to black knot.  Seems to have almost all the same qualities as Stanley, but slightly smaller and sweeter.  Self-fertile and disease resistant.

Grandson discovered Grandpa's Prune on the family farm in the late 1970's and was surprized to see it very free of black-knot.  We had some budded and planted an orchard that was later abandoned, but some of the trees are still alive and well and still very free of black knot.