We had 31' overnight in Phoenix and the canna leaves turned dark and wilted. Do I leave the plants or do I need to dig up the rhizomes and start over?
Canna Lily Froze
Certified GKH Gardening Expert
The leaves on the canna are far more susceptible to frost than the roots. Plus, the roots have the insulating protection of the soil. In your area, the roots should be fine being left in the ground for the winter and they will regrow in the spring.