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Tomatoe seedlings

Why have these shrivelled up like this. I did keep them in the shade. I put them outside, I've brought them in now. Anything I can do to save them ?

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They need warmth and light, especially light. Night time temps need to be in double figures consistently for them to be outside and thrive. I can 't grow outdoors here, but even in the house, it's only about 14 overnight in the south facing kitchen, and the greenhouse would still be too cold. I'll be waiting for another week or two before transferring mine completely, which is probably a week or two later than usual. They're around 12 to 15 inches and ready to flower.
I live in west central Scotland - not where that photo is...
Some of those tomatoes are only just forming a first set of leaves. They're a long way from being ready to be outdoors.
I live in west central Scotland - not where that photo is...
If they were mine, I would pot each seedling up separately in 3” flower pots and keep them in the warm until they’ve made a lot of new growth.
You may be lucky then and save them but time’s getting on, you may be better advised to go to a garden centre/nursery and buy some ready grown plants for this year.
Put it down to experience and try again next year.
Mine are sown 3 seeds to a 3 inch deep pot, then potted individually when they're small. Potted on at least once more before the greenhouse - sometimes twice depending on general growth and conditions.
Someone here yesterday was looking to buy a couple of plants, and if GCs don't have them, the DIY stores, and similar, often still have some they're looking to unload. I've done that in the past, before I started growing from seed, and you often get them for a bargain price.
I live in west central Scotland - not where that photo is...