Dead, Dead, Dead
Today I dug up the four Ghosts that I tried to overwinter in a hoop-house, and they wuz DEAD!
No unusual root pathology, just dead. We probably had some periods in the '20s that lasted 36 hours or so, and low 30's longer than that, so now I know that they won't overwinter here.
Tilled up the bed and got it ready for just two this year. Four is too many. I'm gonna encourage a better root system on the others by using a drip emitter that gives a larger radius under the plant than the point irrigation does.