The Mexican petunia plant is a perennial that grows up to 3 feet high and produces blue, pink or white trumpet-shaped blooms. The blooms open up to 2 inches wide. Its leaves are dark green, although they sometimes appear to have a metallic glow in direct sunlight.
Mexican petunias are often used as edging in flower beds. The plants perform best in warm climates, partial shade and well-drained soil. Blooms last for only one day, and the plants spread quickly by dropping their seeds. The Mexican petunia plant is considered an invasive species in Florida, according to the University of Florida's Institute of Food and Agricultural sciences.