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

Creeping Phlox
Shares full sun and low to moderate 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.

Flowering Crabapple
Shares full sun and moderate water; blooms in mid spring, before this one opens; both are strong pollinator plants, and they feed in different months; taller at 20 ft, for the layer behind it.

Wisteria
Shares full sun and moderate water; blooms in mid spring, before this one opens; both are strong pollinator plants, and they feed in different months; climbs to 26 ft behind it, height without the footprint.

Hyacinth
Shares full sun and moderate water; blooms in early spring, before this one opens; low at 10 in, to carpet the ground beneath; both offer pollinator forage, in different months.

Windflower
Takes full sun to part sun and moderate water; blooms in early 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.
Taking over as Hollyhock finishes

Aster
Shares full sun and moderate water; blooms in early fall as this one finishes; both are strong pollinator plants, and they feed in different months; its seed heads stand through winter, for structure and the birds.

Autumn Crocus
Shares full sun and 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

Sea Thrift
Shares full sun and low to moderate water; opens in mid spring and overlaps into this one's season; low at 8 in, to carpet the ground beneath; evergreen, so the bed keeps its shape through winter.