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It sure is Jim, Darkening of leaves is a sign of cold damage on many plants.
Mike there are no Tomatoes with fish genes in, there was an idea to do this but it was quickly dropped.. Tomatoes need a minimum of 10c below this they suffer, purple curled leaves are a sure sign of cold damage.
Also, not much point in giving Lifechange advise on his plants, I should think after three years his plants are well dead!
So? Whats that got to do with it. Jim asked the question about his tomato plants!
I would never say anything but nice about you Charlie. X