I planted a small orchard of European plums in spring of 2017. At the same time, I also planted some Americans/hybrids.
In spring of 2019, all of my Americans/hybrids bloomed, and some even produced fruit (Go Black Ice!) but none of my Europeans produced a single flower. Is it normal for European plums to take longer to come into flower, or are my buds simply killed by cold each year up here in Zone 5A?