Purple Tomato leaves
Hi All, I've been hardening off my toms in a cold greenhouse and only a few of them have bits of purple on the edges of the lower leaves. It seems to affect biggest plants.
I've read this could be a sign of lack of potassium (I was just about to start watering them with tomorite) or it could be due to the cold and I've read this is nothing to worry about? Does anyone know more about this please?