Companion plants for Foam Flower
Foam Flower blooms from April through June. It wants part shade and moderate water. The 8 companion pairings below each state why the pairing works.
Taking over as Foam Flower finishes

Northern Sea Oats
Shares part shade and moderate water; blooms in midsummer as this one finishes; both offer pollinator forage, in different months; its seed heads stand through winter, for structure and the birds.

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

Zigzag Goldenrod
Shares part shade and moderate water; blooms in late summer, extending the bed's season; both offer pollinator forage, in different months; its seed heads stand through winter, for structure and the birds.

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

Blue Wood Aster
Shares part shade and moderate water; blooms in late summer, extending the bed's season; both offer pollinator forage, in different months; its seed heads stand through winter, for structure and the birds.

Blue Mistflower
Shares part shade and moderate water; blooms in midsummer as this one finishes; both offer pollinator forage, in different months; both are North American natives.
Blooming alongside

Tall Oregon Grape
Shares part shade and moderate water; opens in early spring and overlaps into this one's season; evergreen, so the bed keeps its shape through winter; both offer pollinator forage.

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.