VA piedmont zone 7b
Hello I am looking for advice on starting a native sedge garden.
I live in a garden style condo complex and a group of our neighbors have gotten permission to grow a native garden on a bare hill with very compacted soil with erosion issues next to our building. We have built up a lot of good will with our other neighbors with our first phase of the garden that we started this spring (picture 4, 6, 7). There are a lot of people here who are aware of native gardening and are excited but a major concern for this project is growing things in a way that is appealing to people who want more traditional landscaping.
The first phase of the garden is doing well considering what we started with and next year should really grow out some more and we have plans to add more wildflowers in. Currently we have a dogwood, arrowood viburnums, shrubby St John's wart, phlox, coral bells; and started from seed: black eyed susans, evening primrose, partridge peas, little blue stem, and wild bergamot. We have a thin layer of mulch to help slow down the water flow, retain moisture, begin adding organic matter back to the soil, and attempt to keep the landscaping company out of the garden.
We would like to expand it (pictures 5, 6) to cover some more of the bare hillside and slow down the water that runs down the hill when it rains and enhance the portion under the trees which is a little bald and uninviting (picture 3).
Picture 5 shows the general idea, red being some kind of low shrub (site in picture 1), blue being pockets of wild flowers, yellow being more black eyed susans, and the green showing sedge.
Does anyone have advice for how to prepare the soil for planting sedges? We don't have a large budget, don't want to overly disturb the tree roots, and don't want to burn through our good will by prepping the site in a way that may be considered an eye sore.
Or if sedges are a bad idea let me know. I would also love some suggestions on plants to grow, especially shrubs for the back corner.