Companion plants for Cardinal Flower
Cardinal Flower blooms from July through September. It wants part sun and high water. The 8 companion pairings below each state why the pairing works.
Blooming before Cardinal Flower opens

Woodland Stonecrop
Takes part sun to part shade and moderate to high water; blooms in mid spring, before this one opens; lower at 8 in, for the front of the border; both are strong pollinator plants, and they feed in different months.

Coloratus Wintercreeper
Takes part sun to part shade and moderate to high water; blooms in mid spring, before this one opens; lower at 8 in, for the front of the border; both are strong pollinator plants, and they feed in different months.

Yellow Anise
Takes part sun to part shade and moderate to high 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.

Bunchberry
Takes part sun to part shade and moderate to high water; blooms in late spring, before this one opens; lower at 8 in, for the front of the border; both are strong pollinator plants, and they feed in different months.

Decadence Vanilla Cream False Indigo
Takes full sun to part sun and moderate to high water; blooms in late 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.

American Holly
Takes full sun to part sun and moderate to high 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.

Desert Willow
Takes full sun to part sun and moderate to high water; blooms in late spring, before this one opens; both are strong pollinator plants, and they feed in different months; taller at 19 ft, for the layer behind it.
Blooming alongside

American Wintergreen
Takes part sun to part shade and moderate to high water; opens in early summer and overlaps into this one's season; lower at 8 in, for the front of the border; both are strong pollinator plants.