Large genus of about 900 species, some of which are annuals, herbaceous perennials, rhizomatous and tuberous herbs or shrubs, native mainly to tropical and subtropical areas.Their leaves are usually hairy and often fragrant.Grow in light, well-drained soils, in sunny and warm sites.Plant annuals and perennials in flower gardens and shrubs in rock gardens, in groups for ground-covering and borders or in flowerpots.Easily propagated by cuttings. Propagate annuals by seeds.
Herbaceous perennial, grown as an annual plant, with gray-green leaves and big, upright inflorescences of purple flowers in spring and summer.
All data came from Gardens and Plants program. Click
here to Download the FREE version of the program