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Chilli plants have curly leaves

We pinched the tops out of our chili plants a few weeks ago in the hope they would grow new side-shoots, which they have, but now the large older leaves are curling up and the new leaves are crinkly. They have been left outside on a sunny patio - is it too cold at night? why are the plants looking so unhappy?

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Too much sun ,or too dry , the leafs seem trying to protect themselves for drying out .
That depends on your location: leaving these outside at night is asking for trouble unless you are living somewhere warm like Spain! In my part of the country (Sheffield) I have to keep Chilli plants inside on a sunny windowsill around 20 degrees C!
the young growth looks fine to me. Maybe those older leaves were grown in a much "softer" location?
I'd not worry.