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

Sneezeweed
Takes full sun to part sun and moderate water; blooms in midsummer as this one finishes; taller at 3.5 ft, for the layer behind it; both offer pollinator forage, in different months.

False Sunflower
Takes full sun to part sun and moderate water; blooms in midsummer as this one finishes; taller at 4 ft, for the layer behind it; both offer pollinator forage, in different months.

Joe Pye Weed
Takes full sun to part sun and moderate to high water; blooms in midsummer as this one finishes; stands well above at 6 ft, a canopy to plant beneath; both offer pollinator forage, in different months.

Sunflower
Takes full sun to part sun and moderate water; blooms in midsummer as this one finishes; stands well above at 6.5 ft, a canopy to plant beneath; both offer pollinator forage, in different months.

Northern Sea Oats
Takes part sun to part shade and moderate water; blooms in midsummer as this one finishes; taller at 3.5 ft, for the layer behind it; its seed heads stand through winter, for structure and the birds.

Love-Lies-Bleeding
Takes full sun to part sun and moderate water; blooms in midsummer as this one finishes; taller at 3.5 ft, for the layer behind it; both offer pollinator forage, in different months.

Summersweet
Takes part sun to part shade and moderate to high water; blooms in midsummer as this one finishes; stands well above at 6 ft, a canopy to plant beneath; both offer pollinator forage, in different months.
Blooming alongside

Camellia
Takes part sun to part shade and moderate water; opens in midwinter and overlaps into this one's season; stands well above at 6.5 ft, a canopy to plant beneath; evergreen, so the bed keeps its shape through winter.