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

Drooping Leucothoe
Takes part sun to part shade and moderate to high water; blooms in late spring, before this one opens; evergreen, so the bed keeps its shape through winter; taller at 4 ft, for the layer behind it.

Pinxterbloom Azalea
Takes part sun to part shade and moderate to high water; blooms in mid spring, before this one opens; evergreen, so the bed keeps its shape through winter; taller at 5.5 ft, for the layer behind it.

Feathered Friends Fancy Finch Ajuga
Takes part sun to part shade and moderate to high water; blooms in mid spring, before this one opens; evergreen, so the bed keeps its shape through winter; lower at 4 in, for the front of the border.

Blue Princess Holly
Takes full sun to part sun and moderate to high water; blooms in mid spring, before this one opens; evergreen, so the bed keeps its shape through winter; its white flowers settle the purple.

Flowering Dogwood
Takes part sun to part shade and moderate to high water; blooms in mid spring, before this one opens; its white flowers settle the purple.

Shadblow Serviceberry
Takes part sun to part shade and moderate to high water; blooms in mid spring, before this one opens; its white flowers settle the purple.
Taking over as Mint finishes

Common Sneezeweed
Takes full sun to part sun and high water; overlaps, then carries the display into mid fall; its seed heads stand through winter, for structure and the birds; taller at 4 ft, for the layer behind it; this one spreads, so it will crowd its neighbor in time.

Fireworks Goldenrod
Takes full sun to part sun and moderate to high water; blooms in early fall as this one finishes; its seed heads stand through winter, for structure and the birds; taller at 3.5 ft, for the layer behind it; this one spreads, so it will crowd its neighbor in time.