Canadian Gardening: Hardy Clematis, 1 by

wrote:
You might want to check this site to see which clematis would be suitable for your zone Rosemary - http://www.clematis.org/home.html - I looked, but could not find Golden Tiara, maybe its a new one. I have another clematis link on my computer at home, I'll send it to you tonight. Weezingreens in Alaska has a Polish Spirit that does well in her zone (its purple). You can grow clematis in a box, but I'm not sure about overwintering it in your zone. The link above can give you tips on that too. They do like lots and lots of mulch - To achieve this, I dig down about 6" around mine every fall, and pile all of its foliage in the hole, and cover it with dirt and then wood mulch. Here's mine last summer.
Christine