Yellow iris is a regulated invasive species. Species are legal to buy, sell, transport and possess, but may not be introduced into a free-living state, such as released into public waters.
- Yellow iris grows along shorelines, in shallow water and in roadside ditches.
- Competes with native shoreland vegetation.
Yellow iris's should be reported. See the Minnesota Department of Natural Resources recommendations for reporting invasive species.
How to identify yellow iris
- Perennial aquatic herbaceous plant, grows one to five feet tall along shores in shallow water.
- Can also be found in roadside ditches.
- Gradually tapering sword-like leaves up to three fourths of an inch wide, dark green to blue-green color.
- The leaves form in basal clusters without petioles.
- Center of leaf is sharply thickened.
- Two or three deep yellow flowers grow on one round stalk, shorter than outer leaves.
- Three outer drooping sepals with brownish mottled markings surround the true flower.
- Blooms May through July.
- Oblong capsules each containing numerous smooth, flattened seeds.
- Has a short root system with stout rhizomes for vegetative reproduction.
Reviewed in 2019