Q.Choosing Plants For A Slope
We have a steep sloped yard that we’ve recently semi-terraced with boulders (photo attached). I’d like a relatively monotone green and white look. So far, I plan to plant a bunch of Incrediball hydrangea, boxwood, and Iceberg rose shrubs. I’m also thinking of selecting a green or green-and-white variegated grass, a dwarf evergreen tree or two, and maybe some burning bush for some bright fall color. My question: There is a strip of non-terraced ground underneath the trees (Cherry and birch) on the right. I’d like to plant a hedge of shrubs that both matches my green/white design, will do well on a slope like that, and will crowd out weeds. Any suggestions? Zone 6A, sandy soil, with overhead sprinkling. Any other ideas for the project are welcome! Thanks.

Certified GKH Gardening Expert
The only concern I have would be that your hydrangeas would get too much sun, but as long as the area remains mostly shaded it can be fine.
Ultimately, you have many, many choices for your area, and what you choose will be solely up to your taste.
I can include a few articles that will help, though:
https://www.gardeningknowhow.com/garden-how-to/design/lideas/hillside-rock-gardens.htm
https://www.gardeningknowhow.com/special/slope-hill/plants-that-grow-on-slopes.htm
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-6/zone-6-hydrangea-care.htm
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-6/plants-for-zone-6.htm
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-6/zone-6-native-plants.htm
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-6/zone-6-hedge-plants.htm