Daylilies forum→Rust. Cut them all down?

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Oklahoma (Zone 7a)
Nov 21, 2020 3:32 PM CST
I started a new flowerbed this spring and, of course, wanted some daylilies in it. The main goal of the bed is erosion control, so I bought semi/evergreen daylilies.

The three I bought at a local nursery bloomed nicely. Then in September, one of the bloomed again. Two nice scapes with 18-20 buds each. Bloomed beautifully, but developed bad rust. The scapes had ugly red pustules on them. I cut off all the affected foliage, which was eventually most of it. When it stopped blooming, I cut it to the ground and took all of the foliage away. It has regrown well. About 4 inches tall now.

But that was in September. Is it too late to cut them all down to the ground? Most all of the daylilies have some sign of rust. We had a freeze a few weeks ago, but the evergreens are still going strong. Temps have been in the 60 and 70 range.

The rust doesn't seem to be getting worse, but I wonder what spring will bring.
I plan to get the Azoxy recommended in another thread before spring.

Just wondering if I would damage them if I cut them back now. Thanks for any thoughts.
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
Nov 21, 2020 4:02 PM CST
Since they're new and have been cut back already, there's a risk cutting back again could set them back so you'd have to weigh up whether it's worth it. It should be fine to cut back any that weren't already cut back this year. Daylily rust doesn't always survive the winter in USDA Zone 7a so there's also a chance rust won't come back next year anyway, but it depends on the winter and how accurate your zone determination is (e.g. microclimate effect).

Red is not the normal colour of rust pustules, would they not have been more orangey?

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