Trahlyta in my garden is not in the most optimal place. It gets several hours of shade, but it still manages to do okay, but it does not reach its full height. Bloom time is late June to mid-July.
I purchased it in 2010. This picture is from 2012. I am sure that with more sun, it would have increased more. But the foliage looks nice and healthy and you can see that the scape height is just barely over the foliage.
Blooms open very nicely and I've rarely seen a bad bloom on it. This photo is from July 4, 2015. I just thought it was cute with the buds shooting off in the same direction.