Here are pictures of one of the hills we are wanting to grow ground cover on and images of the weeds growing on it now. Most of it is actually grass but there are still lots of weeds.
The soil is mostly clay in Colorado. It is very dry here. We will certainly need something that can handle drought conditions even though our sprinkler system will water the hills a few times a week. The hills are steep enough that they do not stay moist for long.