salvia flowers

I have several salvias: indigo spires, waverly and others whose names I
don't know. All have a long flower spike made up of many buds (I guess
that's a salvia characteristic?). Only a few of the buds open and the rest
tend to dry and eventually fall off. Sometimes this is due to larvae damage
and I spray with BT to take care of that, though not regularly. Could there
be another reason, such as weather conditions, amount of sun, etc., that
all the buds don't open or is this to be expected?

Barbara - in Berkeley
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