How tall are they? Do the blooms droop or remain erect when fully open?

Cecily they are about 3.5 ft tall. I will have to observe further this week to answer your other question better. Please check back :)

compare to Karl Rosenfield; it's quite common in commerce, it's the correct height and it's currently blooming in zone 7

Cecily, I took some additional photos to show the aaging bloom. Let me know what you think. Karl could certainly be contender. Some have white edges.

I've never seen white edges on mine: I thought that was glare from the camera.

I think the white edges are more on the older blooms that have some fading around the edges from the Sun. That possible?