Companion plants for Bidens
Bidens blooms from May through October. It wants full sun and low water. The 8 companion pairings below each state why the pairing works.
Blooming before Bidens opens

Howard McMinn Manzanita
Shares full sun and low water; blooms in late winter, before this one opens; both are strong pollinator plants, and they feed in different months; evergreen, so the bed keeps its shape through winter.

Chinese Fringe Flower
Takes full sun to part sun and low to moderate water; blooms in early spring, before this one opens; both are strong pollinator plants, and they feed in different months; evergreen, so the bed keeps its shape through winter.
Blooming alongside

Cleveland Sage
Shares full sun and low water; opens in mid spring and overlaps into this one's season; both are strong pollinator plants; evergreen, so the bed keeps its shape through winter.

False Indigo
Shares full sun and low water; both are strong pollinator plants; its seed heads stand through winter, for structure and the birds; taller at 3.5 ft, for the layer behind it.

Little Bluestem
Shares full sun and low water; both are strong pollinator plants; its seed heads stand through winter, for structure and the birds; taller at 3.5 ft, for the layer behind it.

Dragon Slayer Adam's Needle Yucca
Shares full sun and low water; both are strong pollinator plants; evergreen, so the bed keeps its shape through winter; taller at 3.5 ft, for the layer behind it.

Red Yucca
Shares full sun and low water; both are strong pollinator plants; evergreen, so the bed keeps its shape through winter; taller at 5 ft, for the layer behind it.

Purple Lovegrass
Shares full sun and low water; both are strong pollinator plants; its seed heads stand through winter, for structure and the birds; both are North American natives.