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.
Blooming before Larkspur opens

Flowering Cherry
Shares full sun and moderate water; blooms in mid spring, before this one opens; both offer pollinator forage, in different months; a soft color beside the blue.

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.
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.

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 blue, for contrast.

Pampas 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; taller at 8.2 ft, for the layer behind it.

Switchgrass
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; taller at 4.9 ft, for the layer behind it.