Ruellia simplex is an evergreen perennial from Mexico and tropical America, grown for its trumpet-shaped blue to purple flowers. It is easy to grow in warm climates but can become invasive, so choose a sterile or dwarf cultivar where it is not wanted.
Family
Acanthaceae (Acanthus family)
Grows as
Shrub
Light
Full sun, Part shade
Water
Keep soil evenly moist during growth, and let the top layer dry slightly between waterings.
Soil
Well-drained, average garden soil or loam-based potting mix.
Temperature
18–35 °C; protect below 5 °C
How easy
Easy
Native range
Mexico to Trop. America
Climate
subtropical
About
Ruellia simplex, the Mexican petunia, Mexican bluebell, Britton's wild petunia, or Purple showers, is a species of flowering plant in the family Acanthaceae that is native to Mexico, the Caribbean, and South America. It has become a widespread invasive plant in Florida, where it was likely introduced as an ornamental before 1933, as well as in the eastern Mediterranean, South Asia and other parts of the Eastern Hemisphere.
Where it grows
Ruellia simplex is native to Mexico, the West Indies, western Bolivia, southwestern Brazil, Paraguay, Uruguay, and northeastern Argentina. It has been widely used as an ornamental plant and has escaped from cultivation in the United States, Australia and parts of Asia, as well as several Pacific Islands.
[Contains information from Leaf Area Index (LAI) and Heritage Trees from data.gov.sg (National Parks Board), made available under the terms of the Singapore Open Data Licence version 1.0]
Text excerpted from the Wikipedia article Ruellia simplex by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.