Hey Charles,
I have lost a couple of celeriac plants over the past few months, they just suddenly turned to mush.
I am guessing it might be due to heat related (similar to that of lettuces?)…. the temperature yesterday was in the high 20s… I was watering all the salads and celeriac. The temperature has significantly dropped today… about 17 degrees. Was checking on the plants and found this celeriac turning to mush. The smell is quite bad too.