Companion plants for Delphinium
Delphinium blooms from June through July. It wants full sun and moderate water. The 8 companion pairings below each state why the pairing works.
Blooming before Delphinium opens

Eye Candy Moss Phlox
Shares full sun and moderate water; blooms in mid spring, before this one opens; low at 4 in, to carpet the ground beneath; both are strong pollinator plants, and they feed in different months.

Kinnikinnick
Shares full sun and moderate water; blooms in mid spring, before this one opens; low at 8 in, to carpet the ground beneath; both are strong pollinator plants, and they feed in different months.

American Holly
Shares full sun and moderate water; blooms in late 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.

Red Robin Photinia
Shares full sun and moderate water; blooms in mid 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.

Candytuft
Shares full sun and low to moderate water; blooms in mid spring, before this one opens; lower at 10 in, for the front of the border; both are strong pollinator plants, and they feed in different months.

Decadence Lemon Meringue False Indigo
Shares full sun and moderate water; blooms in mid spring, before this one opens; both are strong pollinator plants, and they feed in different months; its seed heads stand through winter, for structure and the birds.

Ever After Ruby Reblooming Azalea
Takes full sun to part sun and moderate water; blooms in mid 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

Prairie Dropseed Grass
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.