Answer: When it comes to selecting shrubs, it is important to consider the type of planting conditions available and begin to limit the selection that way first. Next would come personal preference based on appearance. From your description, I am unable to tell if the location you have in mind is in sun or shade, or how large the area is, or if the soil is shallow (on top of the rocks) or if it is relatively dry (due to tree roots) and so on. For that reason I am really unable to make specific suggestions.
Instead, I would suggest you take a scale drawing or quick sketch and measurements and possibly a wide view photo to your local nursery and/or county extension and work with them to determine some good choices for the location you have in mind. Depending on the microclimate and your personal taste there are just so many plants you could consider! Have fun with your planting!
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