Hi. I have an fence arbor with clematis (prob jackmanii). I hate how bare the arbor looks while the clematis is dormant. I'd like to maintain year round coverage of the arbor with an evergeen climber that wont hurt the clematis. I really want something that stays relatively lush all winter and doesn't lose too many leaves. Any recs would be appreciated. The arbor is in partial shade. I'm in MD zone 6. Thanks.