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Some of my still small plants are beginning to get purple leaves. Mostly basil and tomatoes. According to the Internet, this is caused by a phosphorus deficiency, possibly connected to cold temperatures (it has been unusually cold recently, with as low as 10 °C at night.
Is this correct? Do I need to worry?
I don't think it's the soil that lacks the nutrients, as other plants (mostly chilis) look perfectly healthy with a marvelous green.
