Genus: Ruellia

Ruellia

Photo/Illustration: 
Michelle Gervais
(Ruellia)
roo-EL-lee-a
Synonyms:  Dipteracanthus
Acanthaceae
Shrubs, subshrubs, and evergreen perennials in about 150 species from tropical America, Africa, and Asia belong to the genus Ruellia. The funnel-shaped flowers are the primary draw for many of the species and are sometimes called Mexican petunias. Leaves are often attractively marked as well. They are best used in informal areas of the garden, or in a warm greenhouse. Ruellia love high heat. They may become invasive in warm areas.
Noteworthy characteristics:  Funnel-shaped flowers and often attractive foliage.
Care:  Grow in full sun or part shade in most any fertile, organically rich, moist soil. In the greenhouse, grow in bright filtered light in a very humid location. Water only moderately in winter.
Propagation: 

Can be propagated from softwood cuttings in spring or early summer, or from seed sown at 66° to 75°F in spring.

Problems: 

Bacterial and fungal leaf spots, rust, root rot.

Species, varieties and clutivars for genus Ruellia

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Mexican petunia
Ruellia brittoniana 'Purple Showers'
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Thai ruellia
Ruellia elegans
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Desert ruellia
Ruellia peninsularis