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

Candytuft
Shares full sun and low to moderate water; blooms in mid spring, before this one opens; low at 10 in, to carpet the ground beneath; evergreen, so the bed keeps its shape through winter.

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; lower at 1.3 ft, for the front of the border.

Siberian Squill
Shares full sun and moderate water; blooms in early spring, before this one opens; low at 6 in, to carpet the ground beneath.

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.
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.

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.

Arborvitae
Shares full sun and moderate water; evergreen, so the bed keeps its shape through winter; taller at 20 ft, for the layer behind it.

Pansy
Takes full sun to part sun and moderate water; opens in early spring and overlaps into this one's season; low at 8 in, to carpet the ground beneath.