Can't tell you how thrilled I was to see this article in July 2012 Fine Gardening- detailing the results of this 6 yr. clematis test run at the Chicago Botanical Garden. Suffice it to say that I have become a cerifiable clematis nut in the last few yrs. It makes sense, right?> we already have the conifers and woodies to grow them over, and we don't have much planting space but boy do we still have VERTICAL space!! Hope this is useful to a bunch of you.

best,

mindy

www.cottonarboretum.com/

** scroll down in the link to print out the Excel or PDF version of the test results

Here is a link that might be useful: clematis trial of 110 plants at CBG