My local nursery has Eternal Flame this year. It smells wonderful! Beautiful color that holds well in the safety of the greenhouse...not sure how it does out in real weather, though.

That's Eternal Flame in photo background. Grows straight up. Mine is 4th year and is over 6" tall. Long strong stems. Fades some in full sun. Does ball quite a lot in wet cool weather though.

And a close up

Mine has not faded fast even in hot weather. The size of the blooms is large and the stems grow tall and sturdy. I like the soft color. I do not have any information about cold hardiness.