Elderberry keeps dropping its flowers

My elderberry flowers well , then all of the flowers drop off. Last year it was small and only had a few bunches of flowers so I thought perhaps it was not mature enough yet. This year it is larger and has plenty of flowers but not a single fruit is set, the flowers are all dropping off. There are plenty of pollinators around, I mulched the plant well, I am watering it often.

Why is this? Would it need a second plant to cross pollinate it? Or are there sterile forms that don’t set berries?

I have always understood elderberries need a second plant for cross pollination. If they are from wild seed, 2 should work with since their genetics are at least a little different, but if selecting from improved varieties, grow 2 kinds. I have Nova and York growing next to each other and get great fruit set.

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