So I live the North where there was a cold snap a few weeks ago, where night temperatures dropped below freezing again. I was away on business so I don't actually know if there was frost in the garden. I returned a couple of days later to find a whitish thing developing on some of the leaves, on quite a few plants. Could they be frost damage, or is this some sort of fungal thing? (I've never seen frost damage before as I've just moved to the North!)
