Elderberry bush that flowered and then had the green seeds but lost most of them before ripening

Question

Elderberry bushes had been transplanted in early spring

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Answer 1

I would suspect it was because of the transplant. The shrub was focused on settling in its new location, not on producing berries. The first two years you don't collect the berries, anyway.

https://www.gardeningknowhow.com/edible/fruits/elderberry/planting-elderberry.htm