cultivation of climatis?

Answer 1

Here are a couple of websites that should give you all the information you seek, and then some!
The American Clematis Society's official website: http://clematis.org/home.html

http://www.gardennj.com/clematis.htm

And a pdf document you can print off for further consultation:
http://www.molbaks.com/infopages/clematis.pdf
Happy Gardening!