Answer: That's great that you've had such good luck with your hollyhock! Hollyhocks are perennial, but since they frequently succumb to a common rust disease they are often treated as a biennials. They do, however, readily self-sow, so it's possible you are seeing multiple generations of plants. Have a look around the perimeter of the plant to see if you can find some seedlings--these are probably your best bet for transplanting, rather than trying to divide your thriving plant.
Hollyhock seeds need light to germinate, so when you sow, don't bury the seeds--simply press them onto the surface of the moist growing medium.
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