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Tomato seedlings

in Fruit & veg
Some of my tomato seedlings don't look 100% happy. They are discolouring a bit and slightly ref underneath. What is wrong with them and what can I do? Thanks
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Could be the cold temperatures are limiting the tomatoes phosphorus uptake? I see you have them outside..
I agree with Blue Onion - those plants look stressed. It's too cold in the UK for tomatoes to be outside.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I put them outside during the day but they have been inside most of the time. They spent 3 nights in the greenhouse where it probably got down to about 10 degrees which I wouldn't have thought is particularly cold?
Yes, it looks like cold to me too. They don't really like going much below 14C at any stage.
Oh ok, thanks everyone. Luckilu I've got some more seedlings just popping up and I can look after them more carefully.