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

Pansy
Takes full sun to part sun and moderate to high water; blooms in early spring, before this one opens; lower at 8 in, for the front of the border; both offer pollinator forage, in different months.

Stock
Shares full sun and moderate to high water; blooms in mid spring, before this one opens; both offer pollinator forage, in different months; lower at 1.5 ft, for the front of the border.

Canterbury Bells
Shares full sun and moderate to high water; blooms in late spring, before this one opens; both offer pollinator forage, in different months; lower at 2.5 ft, for the front of the border.

English Daisy
Shares full sun and moderate to high water; blooms in mid spring, before this one opens; low at 6 in, to carpet the ground beneath; both offer pollinator forage, in different months; they only overlap in zone 8.
Blooming alongside

White Clover
Shares full sun and moderate to high water; opens in late spring and overlaps into this one's season; low at 4 in, to carpet the ground beneath; both are strong pollinator plants.

Gardenia
Takes full sun to part sun and high water; opens in late spring and overlaps into this one's season; evergreen, so the bed keeps its shape through winter; its white flowers settle the pink.

Joe Pye Weed
Shares full sun and high water; both are strong pollinator plants; its seed heads stand through winter, for structure and the birds; echoes the pink; they only overlap in zones 8 to 9.

Winterberry
Shares full sun and high water; overlaps, then carries the display into early winter; both are strong pollinator plants; red sits close to pink on the wheel; they only overlap in zones 8 to 9.