Min night temp for tomato seedlings?

My greenhouse is at 6C just now. Is that too cold for tomato seedlings at night time? Should I be switching the electric heater on? If so, what temp is best for them?


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Well very young seedlings need about 13C or possibly 10C for short periods.

If they turn a purple colour it because they are too cold

 

Ah ok. They're purple. I think someone pointed that out in a pic I already posted this morning for another question I had.

Would it be detrimental to be at 6C for just overnight regularly? Or does the fact the day temperatures are around 30C balance it out?


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If it's only at night the temperatures are low you could cover them with some fleece or bubble wrap removing it in the morning. I made a bubble wrap tent for mine as my greenhouse is unheated.