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?