Answer: Your plants sound lovely! The tropical hibiscus are normally quite large and gangly plants. At the grower's they are often treated with growth retardent to keep them compact, as this wears off after a year or so the plants will grow more than in the past. Some gardeners trim off unwieldy branches one at a time during the year so as not to interrupt the blooming cycle, other gardeners cut them back hard in fall or early spring to stimulate branching and control the size. If you do that, then it would also be the time to refresh the soil, repot them into larger pots or to possibly root prune in proportion and replant into the same pots.
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