As we digressed on the other thread but people may not see this there, daylily rust is not a systemic rust so it doesn't need to be killed inside the crown.
I would expect that freezer temperature to kill the daylily if it is in there long enough, although the period of refrigeration first may help it acclimate. The daylily I tried it with years ago died anyway. May be less likely to die if it has been outside in cold weather first. They can take that temperature here in winter (they're getting it today
) but not straight into a freezer in summer.
