Companion plants for Mullein
Mullein 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 Mullein opens

Rock Cress
Shares full sun and low water; blooms in mid spring, before this one opens; low at 4 in, to carpet the ground beneath; both offer pollinator forage, in different months.

Creeping Phlox
Shares full sun and low water; blooms in mid spring, before this one opens; low at 6 in, to carpet the ground beneath; both are strong pollinator plants, and they feed in different months.

Crocus
Shares full sun and low water; blooms in late winter, before this one opens; low at 4 in, to carpet the ground beneath; both offer pollinator forage, in different months.

Grape Hyacinth
Shares full sun and low water; blooms in early spring, before this one opens; lower at 8 in, for the front of the border; both offer pollinator forage, in different months.

Rosemary
Shares full sun and low water; blooms in early 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.
Taking over as Mullein 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.

Autumn Crocus
Shares full sun and low to moderate water; blooms in early fall as this one finishes; low at 6 in, to carpet the ground beneath; both offer pollinator forage, in different months.
Blooming alongside

Thyme
Shares full sun and low water; low at 6 in, to carpet the ground beneath; opens in late spring and overlaps into this one's season; both are strong pollinator plants.