Deadheading hollyhock plants isn't necessary, but it is a good idea. It can help keep the blooms going longer throughout the season and also keeps your plants looking nicer and tidier. ... Hollyhock is a biennial in most growing zones, but if you let the seed pods develop and drop, they will regrow from year to year.

What to do with hollyhocks when they finish flowering?

Deadheading. Cut the flower spikes to the ground when the flowers have faded. If you want to save the seed, wait until the seed cases are brown before collecting the seed and then cutting down the stalks.

Should hollyhocks be cut back after flowering?

Hollyhock flowers can be removed when they fade and stalks can be cut back after flowering. This will prevent seed heads from forming and reseeding. Although, if you'd like to have seeds set for next spring, leave the flowers and a few stalks until the seeds have dropped.