prunus nigra ornamental plum

[starloc]

Ive just bought a couple of these from aldi and ive done a few searches and they do produce fruit, seems to be cherry plum ( or similar )

but i cant find any information on pollination as everyone grows these for the ornamental leaves but they do fruit,

they will probably be fine as all the cherry plums in hedges seem to do fine

does anyone know if they need a pollinator? ,or are they self fertile?