Rick, I have never had a delphinium cultivar live over winter here. I do have one that is some sort of species, and it lives, but does not increase.
Susan, I am in zone 5/6. It used to be 5 until they redrew the lines of zones, then it says I am 6. However, I have pretty harsh conditions out here in the country, and we are near the highest elevation in the county. So, I consider my garden zone 5.
Forgive my spelling -am using an iPad right now, and it is not easy to have one window for looking things up and one for posting.
In addition to the ones you mentioned:
Wormwood (I think that is it
)
Epimedium
Hardy ginger - I have the native and European
Pinela Dragon Tales
Monarda
Spiderwort
Monkshood
Spuria iris
Certain heuchera -newer ones don't seem to be hardy
Clematis
Balloon flower
Phlox
Dianthus
Celone -turtlehead
Certain hardy ferns
Hexastylus
Pulmonaria
Soloman's Seal
Species primrose
Ligularia -I have Britt Marie Crawford
Astillbe
Catmint
I know I have many more that are 8-10 years old....just cannot think off the top of my head. I never divide anything but my daylilies.
