Companion plants for Dianthus
Dianthus blooms from May through August. It wants full sun and low water. The 8 companion pairings below each state why the pairing works.
Blooming before Dianthus opens

Howard McMinn Manzanita
Shares full sun and low water; blooms in late winter, before this one opens; both offer pollinator forage, in different months; evergreen, so the bed keeps its shape through winter.

Chinese Fringe Flower
Takes full sun to part sun and low to moderate water; blooms in early spring, before this one opens; both offer pollinator forage, in different months; evergreen, so the bed keeps its shape through winter.
Taking over as Dianthus finishes

Pink Muhly Grass
Shares full sun and low water; blooms in early fall as this one finishes; both offer pollinator forage, in different months; its seed heads stand through winter, for structure and the birds.

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

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

Fireworks Goldenrod
Shares full sun and low to moderate water; blooms in early fall as this one finishes; both offer pollinator forage, in different months; its seed heads stand through winter, for structure and the birds.
Blooming alongside

Chick Charms Berry Blues Hens & Chicks
Shares full sun and low water; evergreen, so the bed keeps its shape through winter; both offer pollinator forage; lower at 4 in, for the front of the border.

Dragon Slayer Adam's Needle Yucca
Shares full sun and low water; evergreen, so the bed keeps its shape through winter; both offer pollinator forage; taller at 3.5 ft, for the layer behind it.