... Jades actually need dark? Hmm, I never knew that....
Keep in mind, I'm talking about "baby jade" or "elephant bush," Portulacaria afra. We've had a few consistently for the last 4-5 years. Every winter they would slowly lose all their leaves, and not recover until placed outside again in spring. I eliminated all other possibilities -- insects, humidity, you name it -- until lack of a daily dark period was all that was left.
Last winter I put my lights on an 18:6 light-dark cycle, instead of leaving them on 24/7 as I'd been doing for years. No more complete leaf loss from the Portulacarias.
True jade is Crassula, and I'm afraid I can't comment on their light-dark needs.
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