Companion plants for Bachelor's Button
Bachelor's Button blooms from May through July. It wants full sun and low water. The 8 companion pairings below each state why the pairing works.
Taking over as Bachelor's Button finishes

Goldenrod
Shares full sun and low water; blooms in late summer as this one finishes; both are strong pollinator plants, and they feed in different months; its seed heads stand through winter, for structure and the birds.

Autumn Joy Sedum
Shares full sun and low water; blooms in late summer as this one finishes; both are strong pollinator plants, and they feed in different months; its seed heads stand through winter, for structure and the birds.

Perennial Sunflower
Shares full sun and low to moderate water; blooms in late summer as this one finishes; both are strong pollinator plants, and they feed in different months; its seed heads stand through winter, for structure and the birds.

Switchgrass
Shares full sun and low water; blooms in late summer as this one finishes; both are strong pollinator plants, and they feed in different months; its seed heads stand through winter, for structure and the birds.

Little Bluestem
Shares full sun and low water; blooms in late summer as this one finishes; its seed heads stand through winter, for structure and the birds; taller at 3.5 ft, for the layer behind it.

Fountain Grass
Shares full sun and low water; blooms in late summer as this one finishes; its seed heads stand through winter, for structure and the birds; taller at 3.5 ft, for the layer behind it.
Blooming alongside

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

Grape Hyacinth
Shares full sun and low water; blooms in early spring, before this one opens; both offer pollinator forage, in different months; lower at 8 in, for the front of the border.