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

Woodland Stonecrop
Shares part shade and moderate to high water; blooms in mid spring, before this one opens; low at 8 in, to carpet the ground beneath; both are strong pollinator plants, and they feed in different months.

Feathered Friends Fierce Falcon Ajuga
Shares part shade and moderate to high water; blooms in late spring, before this one opens; low at 8 in, to carpet the ground beneath; both are strong pollinator plants, and they feed in different months.

Yellow Anise
Shares 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.

Coloratus Wintercreeper
Shares part shade and moderate to high water; blooms in mid spring, before this one opens; low at 8 in, to carpet the ground beneath; both are strong pollinator plants, and they feed in different months.

Bunchberry
Shares part shade and moderate to high water; blooms in late spring, before this one opens; low at 8 in, to carpet the ground beneath; both are strong pollinator plants, and they feed in different months.

Dutchman's Pipe
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; climbs to 24 ft behind it, height without the footprint.

Pansy
Takes part sun to part shade and moderate to high water; blooms in early spring, before this one opens; low at 8 in, to carpet the ground beneath; both offer pollinator forage, in different months.
Blooming alongside

American Wintergreen
Shares part shade and moderate to high water; opens in early summer and overlaps into this one's season; low at 8 in, to carpet the ground beneath; both are strong pollinator plants.