Sep 7, 2008 #3 A: Mexican petunia, Ruellia simplex, should grow perfectly well outdoors in the Atlanta area. Gardeners have traditionally used Mexican petunia to add height to perennial borders, since it can grow up to three feet tall. It might not, however, be winter-hardy in north Georgia. Mexican petunia is not a real petunia, but its flower looks like one. As its name implies, Mexican petunia comes from south of the border. Because the seeds of the Mexican petunia can germinate for years after the adults are gone, it’s a battle you’ve got to really commit to. The 16 Most Common Poisonous Plants for Dogs #1 Sago Palm. The tempting beauty of wisteria is alluring but do you know that it is a mildly poisonous plant, mainly for cats and dogs. Danny . Mexican Petunias If anyone knows whether Russian Tortoises or Leopard Tortoises can eat them safely please let me know. Hereof, are Mexican petunias edible? 5 Year Member. From Seed. Mexican-petunia is a perennial in zones 8 to 11 that stands up to 3 feet in height. Every part of it is poisonous, especially seeds. Can I leave it out for the winter or do I have to take it inside? Photo by Gretchen Heber. Leaf margins are can be smooth or wavy. Mexican petunia is an attractive blue- to purple-flowered perennial that is available at some garden centers. If only few seeds are ingested they can cause mild abdominal pain, vomiting, diarrhea and depression of the central nervous system. Mexican Petunia. These ornamental palms are popular in warmer climates and every part of it is toxic to dogs. Answer: Neither Ruellia brittonianna (Mexican petunia) nor any other species of Ruellia appear in any of the following toxic plant databases: Poisonous Plants of … Stems are green or purple and leaves are dark green, oppositely arranged and lance-shaped, roughly 6 to 12 inches long and ½ to ¾ inches wide. 10 Year Member! They grow rapidly and spread easily, even in conditions that would be less than ideal for many plants. Petunias are the perfect flower for gardeners concerned about planting cat-friendly gardens. Petunias have been used as garnish, but as members of the nightshade family, they are not to be eaten. In truth, Mexican petunia removal requires vigilant attention to the garden or lawn where they’re a problem and may become a long-term project. Mexican petunia spreads naturally by both seeds – it can spew the small brown discs as far as ten feet – and rhizomes. Veins are prominent on the underside of the leaf. (No, I'm not talking about that tacky tourist park on the NC/SC line where Pedro sells sombreros the size of beach umbrellas.) #2 Tomato Plant. Q: I had Mexican petunia in my flower garden for the first time this year. Sep 7, 2008 #2 E. egyptiandan New Member. I can't find it on any toxic plant list. 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