White wood aster (Eurybia divaricata, formerly Aster divaricatus) is a woodland plant. It makes a great groundcover for dry, shady or partly shady areas.
Tiny white flowers cover the plant from late summer into fall. It is 2-3' tall when in bloom. They are deer resistant, drought tolerant, and pollinator friendly! The tiny yellow flower centers gradually fade to pink/red, and the dark wiry stems provide further contrast and interest.
These guys are native to much of the Eastern US and Canada, and definitely native to South Central PA.
Sources: USDA Native Plants Database, North Creek Nurseries
📷: @moniquegudgeon at Sculpture by the Lakes