It's strange. The disorder can persist for a few months, then the plants usually 'snap out of it' with arrival of Spring. Just the other day, however, I noticed it starting on plants even in my relatively warm greenhouse where I maintain daytime temps in the 70's and 80's. The disorder may be less associated with temperature than with winter light quality and day length. Sometimes, the plant never pulls through and most of the leaves turn necrotic.
Matt
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