tall plants/trees for fence planting - total shade
Hi all - we just replaced our fence in the backyard and it looks great. Because we're in a high density neighbourhood we'd like to add to the privacy by planting something fast growing that will extend beyond the height of the fence (which is 7'). Here's the challenge. The fence is pressure treated wood and the area where we would plant gets absolutely no sun. Is this an impossible task? We already have very mature lilac trees in this area that have done really well.
Any and all suggestions welcome!