They should be able to tolerate the cold just fine as long as your temperatures are above freezing. If they are looking puny, I'd be more inclined to think the issues are related to excess moisture, rainfall, dew, etc. The ones we have here are not very fond of having constantly wet foliage or constantly wet roots, although they grow fine in moist soil. They just don't really like waterlogged roots if you've been having lots of rain.

Are these native plants or are they some you either grew from seed or purchased? By saying they are looking puny do you mean that they just aren't growing? Is their color a bit off or do they show any symptoms of leaf spots on their foliage or something like mildew or mold?

Mine are growing like crazy, but no blooms yet. Maybe I'll hit it with some fertilizer.

Mine are up, but mine are the minis (the blooms anyway). They are only about 12" now (3'x3' mature) but mine don't bloom til late summer. Not sure about other types. I know once it heats up they will take off though! Mine are in very well draining soil. A little too well...

Blooming but look like plants that are thirsty, mine are no thirsty but probally to wet although put in garage overnight &a look much better but I did water again I think she's going to be sleight glad we're getting some warmth. Thanks