How to Eradicate Mexican Petunias


Mexican petunia is a plant native to Mexico that grows prolifically in warm regions of the United States. Many gardeners make the mistake of adding Mexican petunias to flower gardens or landscapes without taking steps to contain this wildly spreading plant. If these plants are taking over, eradicate Mexican petunias by applying the herbicide glyphosate. If you prefer to avoid chemicals, eradicate the Mexican petunias by pulling them up by the roots.

Step 1

Cut the Mexican petunia plants down to 1 or 2 inches above the soil level during the growing season. Dispose of all of the plant foliage in the garbage bag.

Step 2

Choose a day that is sunny, above 60 degrees and calm. Apply the glyphosate to the remaining stems of the Mexican petunia plants. Saturate the entire growing area thoroughly, but make sure you do not overspray any other planting areas.

Step 3

Monitor the Mexican petunia plants during the next three to four days. If you do not see obvious wilting and yellowing, reapply the glyphosate a second time to ensure you eradicate the plants.

Tips and Warnings

  • Wear long pants and long sleeves as you apply the glyphosate to protect yourself from this chemical. Keep children and pets away from the sprayed area until it is dry.

Things You'll Need

  • Garden gloves
  • Garbage bag
  • Garden shears
  • Glyphosate


  • Pinellas Chapter of the Florida Native Plant Society: Ruellias
Keywords: Mexican petunias, eradicate Mexican petunias, glyphosate

About this Author

Kathryn Hatter is a 42-year-old veteran homeschool educator and regular contributor to Natural News. She is an accomplished gardener, seamstress, quilter, painter, cook, decorator, digital graphics creator and she enjoys technical and computer gadgets. She began writing for Internet publications in 2007. She is interested in natural health and hopes to continue her formal education in the health field (nursing) when family commitments will allow.