On one side of my Victoria plum tree this year I have Victoria plums, but on the other side l have small orange coloured, cherry-sized plums, which, by the way are delicious. What are they and why are they there?
Certified GKH Gardening Expert
It sounds like the rootstock has begun to assert itself on the tree. Typically you would want to remove the rootstock branches, but if you are enjoying the fruit, you can leave them.
As to the variety, it would be hard to say as there are several used for grafting. Here is a list of some typical rootstocks that are used for plums: