This year my cone flowers that I have in one flower bed are finally growing well after four years of trying many new ones from bluestone perennials. There was plenty of trial and error during the four years and many did not survive our zone 4 winters. I also tried Leilani the very first year it took right off and was great, the next spring it didn't return, it was replaced. I know I have some Pow Wow Wildberry and some Cheyenne Spirit and one Pow Wow white plus Prairie Splendor because of it's longer bloom season. I will have to check the tags and see which ones are growing this year. I am happy that they finally seem to be doing well this year, hope it continues.
In another area of my main gardens I have an old variety Magnus that has done well for years and slowly increased it's number of plants. I leave some of the seedheads for the birds in fall which also gives me plants that I keep within limits.
I also have seedlings that I started from seed of both Pow Wow Wildberry and Cheyenne Spirit. I am waiting on them to get larger before I plant them in the gardens.