Tomatoe plants look purple???

[Confusedm87]

So i have started tomatoes from seed on my window sill then moved to a poly tunnel. They've been repotted and watered regularly, but compared to the ones in garden centers which are green they look purple and light green by comparison. I have 5 varietys and they are all looking the same. Am i doing something wrong? It's my first time growing vegetables please help!

they look lovely!

Probably too cold to put them out yet, even in a poly tunnel. The nights aren’t warm enough yet, so if you can bring them back indoors, that might be best.

Yes, probably a bit cold, but purple isn't that unusual so don’t worry, you’re doing OK

Agree. They’ve been too cold. Bring them back inside

Tomatoes need to be 14 degrees or warmer to be really happy, so your poly tunnel is probably too cold for them. Bring them back indoors at least overnight - they are nice and sturdy so should perk up fairly quickly. The quality of the new peat free composts is very variable still so they might benefit from a weak general purpose feed sooner than usual too.