These newer echinaceas are trickier. As I understand it, pathogens are the cause of many echinaceas to simply die in the winter. Apparently not so much the cold or wet, although they will damage them.
I've learned a bit. The new hybrids.....I also bought cheyenne but a red one.....need to build up a good sized root system before they flower. All that I bought before midsummer were cut back to deny flowering. I either potted on or planted out, if they were of good size, into enriched soil and watered well. They are now flowering well amd with plenty of buds to come. Those that I considered might survive the winter.....summer sky, sundown, white swan, hot Papya, marmalade, sunrise, etc. have made impressive amd tall clumps now.
Many of the new varieties were prone to wilting as soon as flower heads formed. This again was because the root system was too small. Allowing them to flower later overcame this problem.
I used to think echinaceas were "prairie" plants and therefore needed hot dry comditions. However, they do need some moisture as well as sun.
Gardening is a constantly learning process, isn't it? I try hard not to lose plants and if I do I try to find out why