Hi!
We have a berm along the back of our property and I struggled for some time to find a low growing shrub to plant along its 80' length. Someone recommended Juniper 'Grey Owl'. It took a little while to find it, but I'm delighted with its performance and form. It grows 3-4' tall and 4-6' wide, has beautiful silvery blue grey foliage, produces lots of silvery berries which some birds like, loves full sun and after the first two years requires little additional maintenance which on a hillside is a very good thing! It's also a native plant and so likes the conditions I have here. I did dig a lot of Permatil into the planting hole because we have voles who just love to chew on the roots in winter.
I've been thinking of using the sumac 'Gro-Low' with it because of the sumac's glossy summer foliage and fall color. The only thing stopping this decision is the sumac's "enthusiasm" and doubts that I could keep up with it.
Perhaps someone else will offer some additional suggestions.
Good luck
Pat