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

Rock Cress
Shares full sun and low water; blooms in mid spring, before this one opens; both offer pollinator forage, in different months; evergreen, so the bed keeps its shape through winter.

Creeping Phlox
Shares full sun and low water; blooms in mid spring, before this one opens; both are strong pollinator plants, and they feed in different months; lower at 6 in, for the front of the border.

Flowering Crabapple
Shares full sun and low to moderate water; blooms in mid spring, before this one opens; both are strong pollinator plants, and they feed in different months; echoes the pink.

Wisteria
Shares full sun and low to moderate water; blooms in mid spring, before this one opens; both are strong pollinator plants, and they feed in different months.

Lilac
Shares full sun and low to moderate water; blooms in mid spring, before this one opens; both offer pollinator forage, in different months; taller at 10 ft, for the layer behind it.

Viburnum
Shares full sun and low to moderate water; blooms in mid spring, before this one opens; both offer pollinator forage, in different months; taller at 6.5 ft, for the layer behind it.
Taking over as Penstemon finishes

Goldenrod
Shares full sun and low water; overlaps, then carries the display into mid fall; both are strong pollinator plants; its seed heads stand through winter, for structure and the birds.

Switchgrass
Shares full sun and low water; overlaps, then carries the display into mid fall; both are strong pollinator plants; its seed heads stand through winter, for structure and the birds.