Answer: You did a great transplant job! It certainly won't harm it to shorten it, although you will lose some blooms. Most of the taller varieties of hollyhocks do need staking or are planted along the sunny side of a tall fence and tied to it. (This works best if the prevailing winds blow it against the fence and not away from it.) The only thing you can do to discourage extra height is to be sure not to overfeed the plants with nitrogen.
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