Invasive Plant Factsheet
This colorful ornamental perennial, introduced from Europe and still sold commercially for use in garden pools, has escaped from gardens and become an invasive noxious weed. It poses a threat to wetlands throughout much of North America, including Arlington and Alexandria, Virginia, as it colonizes in large numbers and competes with native shoreland vegetation.
- Caltha palustris (Marsh Marigold)
- Iris virginica (Virginia Blue Flag) & closely related
Iris versicolor (Blue Flag)
- Sisyrinchium angustifolium (Narrow-leaved Blue-eyed Grass)
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