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Sweetpea stem and leaves turning pink

I put my sweetpeas outside last week to harden off. I've been covering them with fleece over night as it's dropped to 9 degrees for around an hour. Yesterday I noticed a pink tinge to the leaves and stem and today it's more pronounced.
I planted black knight which I've grown before without noticing this colouration.
Is this normal or a sign of some illness/pest? I'll post pictures when it's not raining.
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Evening!
I'm sure that I read somewhere that it can be that they are lacking nutrients... Or it can be that you have just moved them and they are adjusting.
I'm sure other more experienced people will be able to confirm whether I am correct or not.