We had single digits several nights and damage galore. Most if not all the yuccas are fine though. Oddly the "winter purple" aloifolia has some damage. Was assured by an expert that "winter purple" was not different and just caused by soil variations. Not sure what to think now. Many agaves look like hell but have only probably lost a couple of them. Notably murpheyi and palmeri. Still hope for a recovery after spring comes.