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

Azalea
Shares part shade and moderate water; blooms in mid spring, before this one opens; evergreen, so the bed keeps its shape through winter; taller at 4 ft, for the layer behind it.

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

Camellia
Shares part shade and moderate water; blooms in midwinter, before this one opens; evergreen, so the bed keeps its shape through winter; stands well above at 6.5 ft, a canopy to plant beneath.

Hellebore
Shares part shade and moderate water; blooms in late winter, before this one opens; evergreen, so the bed keeps its shape through winter; echoes the pink.

Primrose
Shares part shade and moderate water; blooms in early spring, before this one opens; lower at 8 in, for the front of the border.
Blooming alongside

Gardenia
Takes part sun to part shade and moderate to high water; opens in late spring and overlaps into this one's season; evergreen, so the bed keeps its shape through winter; taller at 4 ft, for the layer behind it.

Christmas Fern
Takes part shade to full shade and moderate water; evergreen, so the bed keeps its shape through winter.

Northern Sea Oats
Shares part shade and moderate water; its seed heads stand through winter, for structure and the birds; taller at 3.5 ft, for the layer behind it.