Companion plants for Peony
Peony 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 Peony finishes

Joe Pye Weed
Shares full sun and moderate to high water; blooms in midsummer as this one finishes; its seed heads stand through winter, for structure and the birds; taller at 5.9 ft, for the layer behind it.

Sneezeweed
Shares full sun and moderate water; blooms in midsummer as this one finishes; 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; its seed heads stand through winter, for structure and the birds; taller at 3.9 ft, for the layer behind it.

Sunflower
Shares full sun and moderate water; blooms in midsummer as this one finishes; its seed heads stand through winter, for structure and the birds; taller at 6.6 ft, for the layer behind it.

Feather Reed Grass
Shares full sun and moderate water; overlaps, then carries the display into late summer; its seed heads stand through winter, for structure and the birds; taller at 4.9 ft, for the layer behind it.

Fountain Grass
Shares full sun and low to moderate water; blooms in late summer, extending the bed's season; its seed heads stand through winter, for structure and the birds.

Switchgrass
Shares full sun and low to moderate water; blooms in late summer, extending the bed's season; its seed heads stand through winter, for structure and the birds; taller at 4.9 ft, for the layer behind it.
Blooming alongside

Arborvitae
Shares full sun and moderate water; evergreen, so the bed keeps its shape through winter; stands well above at 20 ft, a canopy to plant beneath.