Abstract

Abstract Hibiscus syriacus L., commonly known as rose of sharon or althea, is a plant which can endure extreme heat, drought, and poor soil to provide a freeflowering summer shrub. The landscape qualities of the species have been enhanced by the development of triploid cultivars with compact growth habit; leathery, dark green leaves; sterility; and abundant, continuous flowering throughout the summer. In 10 years ‘Diana’ (1), the first introduced triploid cultivar, has become highly esteemed and is now the leading cultivar grown by nurserymen.

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