But weirdly enough, a year or two ago, I noticed some different color vines mixed in with Comtesse. Then, come fall, they bloomed. It was the very same Sweet Autumn Clematis that had died years ago! So now my arbor is on overload. It is filled with massive clematis vines that bloom from spring to fall. I also have a purple "Jackmanii" clematis in the mix. The pink and purple clematis bloom during the summer and the white one begins blooming in September. The pictures show the different faces of my arbor over the summer. Gotta love mother nature!