Narrowleaf Mountain Mint (Pycnanthemum tenuifolium) is in our garden. This photo is from our garden. The photo and scientific name from Alex were incorrect.
Narrowleaf Mountain Mint is a rhizomatous native perennial with narrow, grass-like leaves and flattened clusters of tiny white flowers dotted with purple. It thrives in Virginia and is well-known for attracting a wide variety of pollinators.
Virginia Mountain Mint (Pycnanthemum virginianum) is similar. The USGS.gov website has a video of a bee on Virginia Mountain Mint.