Hibiscus schizopetalus aka Campanilla

Hibiscus schizopetalus is a woody shrub in the mallow family, Malvaceae. Its native range runs from southeastern Kenya to eastern Tanzania. It grows in a wet tropical climate. Common names include fringed rosemallow, fringed hibiscus, and Japanese lantern. The last name refers to its hanging flowers, not its origin. This plant comes from eastern Africa, not Japan.

The shrub has a narrow form, with upright stems that arch outward. Slender branches may droop as they grow. Garden height ranges from about 6–13 feet [1.8–4 metres], depending on the source. Reported spread ranges from about 3–6 feet [1–1.83 metres]. RHS gives five to ten years to reach mature size. The dark green leaves have an oval outline and toothed edges. They reach about 5 inches [0.13 metres] long. Sources describe evergreen or semi-evergreen growth, though RHS also lists deciduous foliage.

The flowers hang from long, thin stalks. Each bloom reaches about 3 inches [0.08 metres] across. Its deeply cut petals curl back from the centre. Flower colours range from pink and red to bright orange-red. A long staminal column hangs well beyond the petals. These parts give each flower its lantern-like shape. Missouri Botanical Garden describes flowering as seasonal, without naming fixed months. The blooms also draw butterflies to the garden.

Grow this shrub in full sun with shelter from exposure. It needs rich soil that holds moisture but drains well. RHS lists loam and an acid to neutral pH. Young plants benefit from ample water and feeding. The shrub does not tolerate drought. It is winter hardy in USDA zones 10–11. RHS rates it H1B, allowing summer growth outdoors in Britain. In frost-prone areas, grow it in a pot. Bring it indoors before the first autumn frost. Give overwintering plants a sunny place and cool nights.

Where hardy, use it alone, in groups, or as a hedge or screen. It can also be trained as a standard. Indoor plants need pruning to keep their shape compact. Cuttings offer a way to raise new plants. Watch for aphids, scale insects, mealybugs, and glasshouse whitefly under glass. Powdery mildew can occur; honey fungus is a rarer risk. Dim light, changing temperatures, dry air, or uneven watering can cause bud loss.