likely needs more sun.
might do ok if you take some of the berries
off so the rest can ripen.
might need added nutrients P and K.
might need more room.
might be the wrong variety for that location.
I was under the impression that it was best to have two different
blueberry cultivars in close proximity to ensure cross pollination and
better fruit set.
Failure to set and ripen fruit is due to either lack of pollination, stress
due to improper culture (pruning, water, soil, fertilizer), disease or pests.
A google search turns up that blueberries might fail to ripen if they are
attacked by the Holly Midge.
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