The easiest way to propagate Hollyhocks is by seed, which can be sown directly in the ground in spring or started indoors, as they readily self-sow and are best propagated through seed collection from mature seed pods on the plant when they turn brown and dry out; simply harvest the seeds and sow them where you want new plants to grow; for more control, you can also start seeds indoors in pots before transplanting outdoors. 

Key points about propagating Hollyhock with seeds:

Harvesting seeds: Wait until the seed pods on the plant turn brown and dry completely before collecting them. 

Sowing seeds: Sow seeds directly in the ground in spring, or start them indoors in pots a few weeks before the last frost. 

Seed depth: Plant seeds about ¼ inch deep in the soil. 

Spacing: Space seedlings about 2 feet apart when transplanting outdoors. 

Germination: Seeds typically germinate within a couple of weeks. 

Other methods (less common):

Basal cuttings: In spring, you can try taking cuttings from the base of the plant, but this method is less reliable than seed propagation.