Mine have bloomed at all times of the year, and it doesn't matter when the sun sets, the decline in the light triggers the scent regardless. I'm a sound sleeper, so I don't know what time it "shuts off its scent valve", but here in Minnesota it's getting dark around 8-ish, and it's still wooing the moths at 10-11 when I usually head for bed.
The blooms last at least a month, and I've had them go for up to 3 months when the conditions were good. I have two of them mounted on cork bark.
Matt
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