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Learn about the various types of perennial wildflowers and how to successfully grow them with this gardening guide. Flowers Perennials Plants Wildflowers. Photo By: DK - Simple Steps to Success: Lawns and Groundcover Â© 2012 Dorling Kindersley Limited. Photo By: DK - Simple Steps to Success: Lawns and Groundcover Â© 2012 Dorling Kindersley Limited.
Assuming that you are referring to the common hibiscus, Hibiscus rosa-sinensis, they are perennials, because they are viable year after year. Annuals are plants that grow, flower, and die in the space of one year. Of course, hibiscus are also tropical plants, so if you grow them in a northern area (where winter temps fall below freezing,) they will be killed by the cold, so you will have to get new bushes every year - thus, you might think they are annuals.