Mine didn't. Did you do anything special to protect it? Inquiring minds want to know. I might try another one if I thought I could get it through the winter.

Not surprising to me. I have posted several times that I have a few friends in Michigan zone 5 that have successfully overwintered Florida Sieboldii several winters now. Each person has to give plants a try since everyone's zone 5 is not identical and each garden has microclimates in it that allows plants to survive that are not supposed to. The hardiness ratings of most clematis is not known with any certainty, hence the survey on Clematis on the Web about plant growth characteristics and hardiness ratings.

Ophelia you might want to plant your sieboldii in a protected area where it will either remain covered with snow all winter or offer more protection.

In the past when I didn't know the hardiness of some brugmansias that I was growing, I got a big 5 gallon pot that a plant had come in and filled it with leaves. The pot was inverted over the area where the brug stalks were cut back and kept in place over the winter by adding bricks to the top of the pot. Make sure to plant your plant deeper in the ground than it was in its original pot so the roots are further in the ground and further insulated.

I just discovered my Vienetta (a patio clematis that has a lot of sieboldii in it) has survived -20 F from this past winter. What's really surprising is that it is budding out on vines 2 feet up - way above the leaf pile I dumped on it for protection. I'm happy! But now I have to find another place to squeeze in my new clematis.

Yes, I remember your overturned pot idea and meant to try it out (still do, in fact). Unfortunately, due to a return of my depression, I had no energy and didn't winter-protect anything last year and ended up losing some of my roses, as well as some other stuff. Even more unfortunately, this coincided with a harsh season. I'm back on my medication and hope I won't repeat that experience again!