Answer: These plants are spreading and wide as implied by the name, but ultimately they should reach at least an approximation of the stated height. I would expect them to send up new shoots from the roots next spring, and these shoots should be taller and create a more mounded effect. In the spring, trim back the shoots that have sprawled out. This should encourage them to branch closer to the base, and more branching should cause additional blooms. After that, an occasional light shearing or trimming of extremely wayward shoots should keep the plants in bounds during the season. I love your description, by the way.
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