Answer: Your Limelight hydrangea will look attractive through the fall months so don't prune it now. The flowers will turn from whitish green to a dusty pink when the weather gets cold. You can prune it down after the first heavy frost of the season. Your purple hydrangea will also look nice all through the autumn months. Wait until early next spring to do your pruning. There's no reason you should not plant a hardy hibiscus next to your hydrangea.
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