The leaves were all frozen. I will have to wait and see if they regrow. Annoying thing is that other plot is sheltered by trees so quite a few volunteers there are find.
The mist then rolled in about 7 am, it was a couple of hours late but it has protected them from getting the sun on them.
So it is a wait and see. I could so easily have thrown something over them. I have a couple of piles of straw.