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

Sneezeweed
Shares full sun and moderate water; blooms in midsummer 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.

Joe Pye Weed
Shares full sun and moderate to high water; blooms in midsummer 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.

False Sunflower
Shares full sun and moderate water; blooms in midsummer 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.

Sunflower
Shares full sun and moderate water; blooms in midsummer 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.

Passionflower
Shares full sun and moderate water; blooms in midsummer as this one finishes; both are strong pollinator plants, and they feed in different months; echoes the purple.

Love-Lies-Bleeding
Shares full sun and moderate water; blooms in midsummer as this one finishes; both are strong pollinator plants, and they feed in different months; taller at 3.5 ft, for the layer behind it.

Rose of Sharon
Shares full sun and moderate water; blooms in midsummer as this one finishes; both offer pollinator forage, in different months; stands well above at 8 ft, a canopy to plant beneath.

Lavender
Shares full sun and low to moderate water; overlaps, then carries the display into late summer; both are strong pollinator plants; evergreen, so the bed keeps its shape through winter.