I read your post with a sinking heart, as this year I did a lot of cuttings for potroots, most in four inch pots. "Duh, why didn't I think of that?" Last night reached 25 degrees here, as well.

Good news is that I'd be surprised if your potted tubers will be effected, since they were insulated by soil in a good-sized pot. Bad news is that I'm not so sure about mine.

When you're able to pull yours out of the pots and rinse them off, slice some of the tail root off and examine it. Should be crisp starchy white, like a raw potato.

If it looks like a partially sautéd onion, chances are that the cold froze the water in the cells, and the frozen water burst the cell walls like a pop can left in the freezer. When this happens, the tuber will seem fine for a while, but will be reduced to a squishy rotting mass in tuber skin bags. Sadly, I know this from leaving tubers too long in an uninsulated garage one year, and lost ninty percent of them... But through slicing ends off tubers with dogged determination, I had eventually found viable tubers in that sad mess.

Hope this helps... And I really wished I read your question yesterday before the cold weather hit me!

CiCi

CiCi, you gave me hope. Thank you! The closest Weather Underground station actually showed 20.5F as the temp when I got up at 6 Monday morning. I need to get my own thermometer out, because we may not get the same temperatures in our yard. It was definitely cold! The entire yard was frosted and I had to scrape a thick layer off the car windows. Today was much warmer and I started digging when I got home from work, expecting mush. But so far, the tubers are white inside! I'm so glad you told me to look for that. I had callas in some of the pots and they also look fine. I got about halfway through the project before it was too dark to see.

Good to hear.

I haven't checked mine, but fortunately only a dozen were above ground. Most were buried under drip line with regular tuber plants.