7K views · 73 reactions | How do you get a hibiscus to bloom again? Prune to Promote Blooming. Hibiscus blooms only last a day before closing and eventually falling off the plant. Keep the plant tidy by removing the spent blooms. For plants that you overwinter indoors or grow outdoors in a mild climate, prune the shrub back by one-third in late winter or early spring | nurserylive | Facebook