Ok green thumbs, looking for a hardy fast growing vine to cover an ugly fence. The fence should just be replaced but has many trees and shrubs growing in and out of it. Would be quite a job to replace. I tried to grow a clematis last year with so so success. No sign of it coming back yet this spring. It grew fairly fast but only a few real long shoots. I live in Wyoming ( zone 4 ). So harsh winters and short growing season are an issue. Thanks for any suggestions!