In my home area, we had a very deep freeze about 2 weeks ago, at least, for this area. You can usually count on 1 hand the number of days it goes below 30 in a given year, and rarely does it go below 25 (Fahrenheit, BTW). It got down to almost 15 degrees for two nights, causing lots of damage...
In particular, I've noticed many of our plants have either died outright, or are looking to be in much worse shape than normal. What can I do to help make sure these plants don't die any further, and how can I tell if they are dead to the point where it's just worth cutting them entirely down?