hi all, I removed most of the mulch from my garden since I was lulled into a false sense of security by the balmy weather we had in March. Well, today it is snowing and I am wondering how my plants are fairing. Would perennials hardy to zone 4 or 5 be okay with -5C temperatures we are supposed to get this evening? (I did throw some leaves back on, but not as many as I had on in the winter).