I have! I'm in zone 5 and Clematis jackmanii grows crazy good. They like their feet in the shade and their head in the sun. Some other clematis are sort of delicate, but this one seems more sturdy.

Thank you for the information. I hope to be able to have some next year. They are so beautiful.

There are many clematis that are hardy to zone 4. I suggest that you go to the clematis forum and do some searching and reading posts with photos. I grow over 30 different varieties.

Clematis do not come true from seed. Sometimes the differences are slight and other times the new plant may have unusual blooms.

These are also very slow to grow plants, often taking three years or more to put on a show as they are using their energy to grow roots.

While I start seeds and also do cuttings I buy most of my plants as potted plants. Some seeds can take two winters to germinate.

Try to find a plant in bloom when you can as I have found that many times the tag is either missing or is incorrect.

Clematis on the Web is a good resource.

Here is a link that might be useful: Clematis on the Web