Companion plants for Lisianthus
Lisianthus blooms from June through September. It wants full sun and moderate water. The 8 companion pairings below each state why the pairing works.
Blooming before Lisianthus opens

Candytuft
Shares full sun and low to moderate water; blooms in mid spring, before this one opens; evergreen, so the bed keeps its shape through winter; lower at 10 in, for the front of the border.

Bergenia
Takes full sun to part sun and moderate water; blooms in mid spring, before this one opens; evergreen, so the bed keeps its shape through winter.

Rock Cress
Shares full sun and low to moderate 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.

Rosemary
Shares full sun and low to moderate water; blooms in early spring, before this one opens; evergreen, so the bed keeps its shape through winter; taller at 3.5 ft, for the layer behind it.
Taking over as Lisianthus finishes

Fountain Grass
Shares full sun and low to moderate water; overlaps, then carries the display into mid fall; its seed heads stand through winter, for structure and the birds; taller at 3.5 ft, for the layer behind it.

Pampas Grass
Shares full sun and low to moderate water; overlaps, then carries the display into mid fall; its seed heads stand through winter, for structure and the birds; taller at 8 ft, for the layer behind it.
Blooming alongside

Arborvitae
Shares full sun and moderate water; evergreen, so the bed keeps its shape through winter; both are North American natives.

Little Bluestem
Shares full sun and low to moderate water; its seed heads stand through winter, for structure and the birds; taller at 3.5 ft, for the layer behind it; both are North American natives.