Companion plants for Goatsbeard
Goatsbeard blooms from June through July. It wants part shade and moderate water. The 8 companion pairings below each state why the pairing works.
Blooming before Goatsbeard opens

Primrose
Shares part shade and moderate water; blooms in early spring, before this one opens; lower at 8 in, for the front of the border; both offer pollinator forage, in different months.

Flowering Dogwood
Shares part shade and moderate water; blooms in mid spring, before this one opens; both offer pollinator forage, in different months; taller at 23 ft, for the layer behind it.

Snowdrop
Shares part shade and moderate water; blooms in late winter, before this one opens; low at 5 in, to carpet the ground beneath; both offer pollinator forage, in different months.

Azalea
Shares part shade and moderate water; blooms in mid spring, before this one opens; both offer pollinator forage, in different months; evergreen, so the bed keeps its shape through winter.

Hellebore
Shares part shade and moderate water; blooms in late winter, before this one opens; evergreen, so the bed keeps its shape through winter; lower at 1.5 ft, for the front of the border.
Taking over as Goatsbeard finishes

Japanese Anemone
Shares part shade and moderate water; blooms in late summer as this one finishes; both offer pollinator forage, in different months; lower at 3 ft, for the front of the border.

Lobelia
Takes part sun to part shade and moderate water; lower at 8 in, for the front of the border; overlaps, then carries the display into early fall; both offer pollinator forage.
Blooming alongside

Pansy
Takes part sun to part shade and moderate water; opens in early spring and overlaps into this one's season; lower at 8 in, for the front of the border; a soft color beside the white.