Answer: You can renovate and rejuvenate your hibiscus over a period of 12 to 24 months. Since they flowers on new growth, you'll want to encourage lots of new growth. Begin by pruning them back by about one-third now. Wait 3-4 months and prune them back by one-third again. Allow them to recover and prune them back again in the fall. The following spring, prune them back again and by next summer they should be well formed and provide you with lots of blooms.
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