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

Snowdrop
Shares part shade and moderate water; blooms in late winter, before this one opens; both offer pollinator forage, in different months; lower at 5 in, for the front of the border.

Camellia
Shares part shade and moderate water; blooms in midwinter, before this one opens; both offer pollinator forage, in different months; evergreen, so the bed keeps its shape through winter; they only overlap in zones 7 to 8.
Taking over as Brunnera finishes

Rhododendron
Shares part shade and moderate water; overlaps, then carries the display into early summer; evergreen, so the bed keeps its shape through winter; both offer pollinator forage.

Wishbone Flower
Shares part shade and moderate water; blooms in early summer as this one finishes; both offer pollinator forage, in different months; lower at 10 in, for the front of the border.

Japanese Stewartia
Takes part sun to part shade and moderate water; blooms in early summer as this one finishes; both offer pollinator forage, in different months; its white flowers settle the blue.

Goatsbeard
Shares part shade and moderate water; blooms in early summer as this one finishes; taller at 4 ft, for the layer behind it; both offer pollinator forage, in different months.

Meadow Rue
Shares part shade and moderate water; blooms in early summer as this one finishes; both offer pollinator forage, in different months; taller at 4 ft, for the layer behind it.

Beautyberry
Takes part sun to part shade and moderate water; blooms in early summer as this one finishes; both offer pollinator forage, in different months; taller at 5 ft, for the layer behind it.