Posted: 20/03/2016 at 21:18
Oh dear, that's so disappointing, Guernsey Donkey I'm sure you are right, it's probably wind burn......but in fairness, I've warned about here lots of times and It's a fact we've had these cold biting winds for many weeks now.
Probably best to return them to your cold greenhouse to recover (they will) meantime be sparse with watering.
I'm never quite sure about the term 'hardening-off' when applied to sweet peas.....they are already hardy, unless made soft by too much pampering.
I'll repeat something else I've said here many times, 'I've never lost sweet peas to frost, but I have lost them to cold winds'.