Answer: Hibiscus flowers on new growth so pruning your shrubs back should encourage new growth and new flowers. Check to make sure nothing in the landscape has changed - hibiscus won't flower if there's too much shade, and they may not flower if they get too much nitrogen (from a lawn, perhaps?) Aside from those cultural differences, your hibiscus should flower if you prune it back to encourage new growth. Best wishes with your garden.
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