Description
Hibiscus – Giant Mallow – Mallow – Rose Mallow –
There are about 220 species of deciduous and evergreen shrubs, trees, annuals and herbaceous perennials, in this genus. They are widely distributed in warm temperate, subtropical and tropical regions, where they occur in a variety of habitats, including stream side, moist woodland, and dry, rocky sites. They have alternate, smooth edged or shallowly to palmately lobed, sometimes toothed leaves, and are grown for their showy, 5 petaled, mainly funnel shaped, held solitary or in clusters, borne over a long period from spring to autumn. The flowers are red, pink, purple, blue, yellow or white and sometimes have contrasting marks at the bases of the petals, and prominent, colorful stamens. Grow in a sunny mixed, herbaceous, or shrub border. Some perennials may be grown as annuals or hedges.
Outdoors, grows in humus rich, moist but well drained, neutral to slightly alkaline soil in full sun. Hibiscus need long, hot summers to flower well. Trim after flowering to maintain shape. Most are drought and frost tender.
Prone to rust, fungal leaf spots, bacterial blight, Verticillium wilt, viruses, stem rots, root rots, whiteflies, aphids, mealybugs, scale insects, mites, Japanese beetles, and caterpillars.
H. trionum – Bladder Ketmia – Flower-of-an-hour – This fast growing, erect to spreading, hairy annual or short lived perennial grows 30-36″ tall and 24″ wide. It produces ovate, palmately 3 to 5 lobed, toothed, dark green leaves, to 3″ long, the central lobes longest, leaves lower down the stems are unlobed. From summer to early autumn it bears trumpet shaped, creamy yellow flowers, to 3″ across, with brown centers and dark purple stamens, are held singly, they are followed by inflated, bladder like seed capsules.
Zones 10-11
