But hardy varieties with large hibiscus flowers do exist. Although they have woody stems like shrubs, the stems do die back to the ground in winter, making them "perennials," technically. These hibiscus plants can be hardy to planting zone 4. Hardy hibiscus will typically bloom in late July or early August for Northern gardeners.
Because of the tropical hibiscus carried by some florist shops, many people don't associate large-flowered hibiscus varieties with Northern landscapes....
Picture of a bloom from a hardy hibiscus.
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