Help on what to plant on retaining wall
I have a 75' retaining wall at the rear of my yard. I am going to dig the mulch out and replace with stone and plant new trees. Here is a picture of what the last owner left us (don't mind the homes behind, you get the idea, I stitched together a few pictures and it didn't do a great job).
I may leave the plum trees on the ends but will remove the juniper and the dead bushes. They are about 10' tall and growing nice. I want something that will grow at least 12-15' to block the homes behind us, but not get too tall so it makes the yard like a "prison." Also want something low maint. that looks nice (color would be nice). I was thinking of these two options:
A solid wall of Emerald Green Arborvitae. They would start at 6' tall and grow from there. I would need a lot of trees, every 3-4 feet.
Put a 6' solid vinyl fence up, and plant more plum and some pear trees on the wall about every 10-12 feet. Eventually they will make a solid wall and add some color in the spring. The only issue is that I don't want anything too wide because it will extend too far over the wall into the grassy area of our yard.
What else should I consider? Open to all ideas.