I have two established plum trees; one of them didn’t produce a single plum this year, but usually gives us large, sweet purple deliciousness. The other one has not produced more than two or three plums for the past three years and I thought this year was going to be the same, but I did actually manage to get 12 pots of jam from them. The plums are small, hardly bigger than a grape, and turn from yellow to red when ripe and are not over-sweet.
I planted four different varieties of plum earlier this year, so I’m hopeful that I’ll have lots of lovely plums in years to come.