Greetings. I need some advise. What should i put under the left double windows.

Zone 6b (East Tennessee), Clay and topsoil mix, mulched, southern side of home (full sun). I would love to layer the area. I have yews, lavender and ornamental grass to the right of the area.

The dimensions are as follows:

• Height: 3ft to the windows
• Depth: 5ft from sidewalk to stone wall
• Width: 10ft from arborvitae on the left to the yews on the right

Any ideas would be greatly appreciated.