Yellow Flag Iris is a large plant with strong competitive abilities. It forms dense colonies and impenetrable thickets in fresh or brackish water, displacing native species and altering habitat for animals. Its buoyant seeds spread long distances and can germinate even after an area burns. Rhizomes can survive prolonged droughts; small sections of rhizomes establish new plants. The iris has little wildlife value and is toxic to grazing animals. All parts of the plant are mildly poisonous.
For information on how to eradicate this invasive, view our statement on herbicide use and preferred alternatives for invasive plants.
You can replace this invasive plant with native alternatives. Here are some plants that make superior replacements.
Match your location on the Texas map to the color squares on the replacement plants below to find suitable replacements for your ecoregion.
State Office Address:
Native Plant Society of Texas
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Fredericksburg, TX 78624
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