Zigzag Spiderwort, Tradescantia subaspera, grows in open woods. Its flowers appear at the axils, or the intersection of the leaf and the stem.
This an unusual, yet beautiful sedge.
Plantain-leafed Sedge, Carex plantaginea, looks more like an iris or something else. It has beautiful shiny blank pointed seedheads and goes well in front of rocks, logs or near a path.
When planting along a sidewalk or driveway, be careful that the plants do not get so large as to block one's way.
Even though a garden is considered shady, it may get periods of full sun during parts of the day.
A mixture of shrubs, flowers, ferns, grasses and sedges can be very beautiful if done with taste and imagination.