Chinese Hibiscus (Hibiscus rosa-sinensis) — identification, habitat & look-alikes

Chinese hibiscus is the evergreen shrub with big, classically red flowers that many people picture as "the Hawaiian flower," but it has never been found growing wild anywhere. A 2024 study concluded it is an ancient hybrid that Polynesian people made from two South Pacific species. In the US it grows outdoors in frost-free areas and as a container plant elsewhere, and it is also called tropical hibiscus.

Appearance

Growth form: An evergreen shrub that typically reaches 7–12 ft (2–3.5 m) in Florida landscapes, and can be trained into tree forms up to about 20 ft (6 m).
Leaves: Glossy, oval, pointed leaves with toothed edges.
Flowers: Five-petaled flowers about 4 in (10 cm) across, classically red, with a long central column of stamens tipped in orange pollen. Garden varieties come in white, pink, orange, yellow, purple, and more, in single or double forms.
Flowering time: Summer and fall in most areas; nearly year-round in South Florida.

Look-alikes

Scarlet rosemallowHibiscus coccineus

Scarlet rosemallow is a native perennial that dies back in winter, with maple-like leaves and deep-red flowers whose petals have gaps between them. Chinese hibiscus is an evergreen shrub with unlobed, glossy leaves.

Why they get mixed upBoth have huge red hibiscus flowers and are planted in Southern gardens.

Rose of SharonHibiscus syriacus

Rose of Sharon is a cold-hardy shrub that drops its leaves in winter; its leaves are shallowly three-lobed, and many flowers have a dark eye at the center. Chinese hibiscus is evergreen and frost-tender.

Why they get mixed upBoth are shrubby hibiscus with similar flower shapes.

Where it lives

Typical habitats: gardens
hedges
patios and containers
Range: Not native to North America. It is planted outdoors in the warmest parts of the US, such as Hawaii and southern and central Florida, and grown as a potted plant in colder regions.
Preferred conditions: Hardy in USDA zones 9–11. It cannot handle temperatures below about 50°F (10°C) without damage; in North Florida it usually freezes to the ground but often regrows from the roots.
Flowering: Flowers Jan–Dec
Flowers Jan–Dec

Growing it

Care: Used as a hedge, screen, foundation shrub, or specimen. Watch for aphids, whiteflies, and mealybugs clustered on buds and leaf undersides. It is not considered a problem invader in Florida's natural areas.
Propagation: Flowers rarely set seed, so plants are mostly grown from cuttings.

Name and classification

About the name: Because it is a hybrid of Hibiscus cooperi (from Vanuatu) and Hibiscus kaute (from Tahiti), some botanists now write the name as Hibiscus × rosa-sinensis.
Varieties and forms: There are thousands of cultivars, with single or double flowers in many colors.

Conservation

IUCN Red List: NENot EvaluatedNot yet assessed

Culture and stories

Culture and stories: Many people came to believe the red Chinese hibiscus was Hawaii's official flower, so in 1988 the legislature settled the question by naming the native yellow hibiscus, maʻo hau hele (Hibiscus brackenridgei), the state flower.
The name rosa-sinensis means "rose of China," but it is neither a rose nor from China.
It is Malaysia's national flower, the bunga raya. In parts of India the flowers have been used to shine shoes, which is why it is also called shoeblack plant.