Best evergreen (in zone 6b) vine to cover fence?
Hi, I'm new here. We bought a house late last summer, and discovered over the fall/winter that we would really like some privacy on our one neighbor's side of our yard. They are a nosy (they always seem to know when we are outside) retired couple that aren't particularly friendly. We have a 5' tall split-rail fence between our properties, with a wire field-type fencing stapled to the wood. A privacy fence is really out of our budget right now, and I don't want to further antagonize the neighbors with a huge fence that blocks the sunlight on their veggie garden (kind of hoping they will share some tomatoes...)
I think a vine of some sort to cover the fence would look nice. I would really like an evergreen vine, but I can't find any that claim to keep their leaves over the winter in my zone. I DON'T want wisteria, trumpet vine, or anything else that is terribly aggressive. I don't want little baby plants popping up all over, ripping my fence down, or overgrowing the neighbors' garden.
I really like crossvine and native coral honeysuckle, and appreciate the fact that they attract hummingbirds. I have some lupine seeds and a wildflower seed mix to go in front of the fence near the ground (so my dog can't see the neighbors and bark at them...probably why they don't like us now that I think of it...) but would like something to kind of fill in everything especially over the winter. I have 150 linear feet of fence to fill in, so shrubs to cover that expanse might be expensive, hence why I am thinking vines. Any other suggestions would be considered too.
Please, any help would be appreciated! Thanks in advance!
-Holly in Harrisburg, PA