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

Perennial Sunflower
Shares full sun and moderate water; blooms in late summer as this one finishes; both offer pollinator forage, in different months; its seed heads stand through winter, for structure and the birds.

Ironweed
Shares full sun and moderate water; blooms in late summer as this one finishes; both offer pollinator forage, in different months; its seed heads stand through winter, for structure and the birds.

Sneezeweed
Shares full sun and moderate water; overlaps, then carries the display into early fall; its seed heads stand through winter, for structure and the birds; both offer pollinator forage.

Switchgrass
Shares full sun and low to moderate water; blooms in late summer as this one finishes; both offer pollinator forage, in different months; its seed heads stand through winter, for structure and the birds.

Little Bluestem
Shares full sun and low to moderate water; blooms in late summer as this one finishes; its seed heads stand through winter, for structure and the birds; blue sits close to purple on the wheel.

Fountain Grass
Shares full sun and low to moderate water; blooms in late summer as this one finishes; its seed heads stand through winter, for structure and the birds; orange against purple, for contrast.
Blooming alongside

Eastern Redbud
Takes full sun to part sun and moderate water; blooms in mid spring, before this one opens; both offer pollinator forage, in different months; stands well above at 23 ft, a canopy to plant beneath.

Rosemary
Shares full sun and low to 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.