The Mexican Petunia seeds can be started indoors in the late winter for transplanting outside, or start the Ruellia seeds directly outside. You can also grow these plants indoors in pots, provided they have a sunny location. The stems will die back to the ground after the first frost. A: Mexican petunia, Ruellia simplex, should grow perfectly well outdoors in the Atlanta area. When growing in a colder climate, grow your Mexican petunias in containers so that you have the option of portability during the winter. The flowers reach 2½ to 3 inches across. Learn more. Aside from flower production, the other way Mexican petunias are affected by light is with the color of their stems. ‘Katie’ is a low-growing Mexican petunia branching from the ground with woody stems and long willow-like leaves. They grow rapidly and spread easily, even in conditions that would be less than ideal for many plants. Examine the plants thoroughly for pests before you … Mexican Petunia features showy pink trumpet-shaped flowers with purple overtones at the ends of the stems from late winter to mid fall. Shrubby perennial native to Mexico. It might not, however, be winter-hardy in north Georgia. However, young plants need regular watering. A winter seeding works well for directly sowing in the flower bed. Save my name, email, and website in this browser for the next time I comment. Indoor plants must be watered regularly as well during hot weather. Mexican petunia flower colors include blue, purple, pink and white. Dwarf Mexican petunia will grow in full sun to partial shade (though you'll get the most flowers in more sun). ©2020 Walter Reeves / The Simple Gardener, Inc. All Rights Reserved. If you find insects, treat the plants before bringing them indoors. Browse and purchase gardening books by Walter Reeves, plus select titles by other authors. Where Mexican Petunia Thrives This is a cold-hardy plant that grows well in U.S. Department of Agriculture zones 7 through 11. Unfortunately, these traits can also enable the plant to become invasive, so it will need to be kept in check. In Zone 9B they may die back in winter but usually bounce back in spring. It’s a hardy plant that be grown in zones 8 to 11. Soil, which is high in nitrogen, will see the Mexican petunia produce lots of dark green foliage in favor of flowers. Native to Mexico and western South America, Ruellia simplex, also known as R. tweediana, R. brittoniana , R. coerulea, and R. malacosperma, is cold hardy to USDA hardiness zones 8 to 11. When growing in a colder climate, grow your Mexican petunias in containers so that you have the option of portability during the winter. The Ruellia, Mexican petunia, is a perennial in zones 8 to 11. You can try to flush out the nitrogen with lots of generous watering to resolve this problem, or you can add a layer of mulch to the surface of the soil, as this can help to draw nitrogen out. Answer: Mexican petunia is considered an herbaceous perennial, which means it freezes to the ground if it gets too cold and grows back from the base. The plant grows rapidly, and because of this, it is known as an invasive species in some regions, notably Florida. Additionally, how do you keep petunias alive in the winter? You can do this by watering the plant as soon as the top layer of the soil starts to dry out. Secondly, do Mexican petunias die in winter? During winter, you shouldn’t need to water the plant so long as there is sufficient rainfall. The seeds have been known to travel quite a distance from the plant; this is helped by rainfall or watering hoses, which can carry the seeds further than usual. The fruit is not ornamentally significant. The blue flowers are attractive in late summer through fall. As long as you follow a basic desert garden to-do list and keep to a conventional summer watering schedule, you should have no problem raising bushels of these purple blossoms. However, petunias usually tolerate temperatures as low as 39 F. (4 C.) with no problem, but they are definitely not plants that will survive the winter in most climates. The wild form has purple flowers, and is native to Mexico, Western South America and the Antilles. Floribundas ‘Celebrity’ series petunias are compact and rain-tolerant. Email The content of this field is kept private and will not be shown publicly. Aside from removing dead or damaged stems, this plant doesn’t necessarily require pruning, but it depends on the type of look you like in your garden. •Mexican petunia had high germination, regardless of the temperature •Native species had seasonal variation with germination Sow native species at higher rates during the fall Mexican petunia in summer treatment (35/25 °C) on day 28 Background Experiments Future Research Look for a spot in your garage or basement where … In bright light, their stems will be purple, while plants kept in partial shade will have bright green stems (SF Gate). As the plant is not sensitive to heat, the time of day when the Mexican petunia gets direct sun is not important, though in general, sun in the morning and shade in the afternoon is preferable when growing a plant in partial shade. Noteworthy Characteristics Petunia-like flowers from spring to frost. 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