I would be very surprised if they did not survive the treatment you describe. Mine have been treated badly and recovered very well. Al

I agree with Al. Assuming they are getting plenty of sunshine, once your soil warms thoroughly, chances are good they will reappear. They are very tough, don't mind wet, heavy soil. One thing you could do is give them a good sprinkle of blood meal or a fish emulsion drench. They also love an annual top dressing of composted manure.

Al and Donna - thank you both for encouragement. I'll try some extra manure (I plant almost everything with a handful or two of well composted manure and it usually works well), and blood meal or fish emulsion - and keep watching. Although crinums are supposed to prefer warmer zones than ours, several of my neighbors have had success.