The article didn't address planting hollyhock bulbs. Is there any difference?
Growing Hollyhocks From Bulbs
Certified GKH Gardening Expert
Hollyhocks do not grow from bulbs. Hollyhocks are often treated as biennials, but they are actually short-lived perennials with string-like root systems. They are typically grown from seeds (sown outdoors during spring or summer) or from established plants. They really don't like to be transplanted, however, so sowing them directly in the garden works best. Many will even self-sow, depending on your climate.