Yellowflag Iris

QUICK IDENTIFICATION

  • Dark green leaves in a fan-like arrangement
  • Three large downward facing yellow petals with brown or purple streaks
  • Bright yellow, showy flower similar to common garden irises
  • Height 3 to 5 feet


Weed Pictures



Weed Information


Type Information
Toxicity Toxic to livestock, dogs, cats and humans.
Control Mechanical, cultural and herbicide. Contact your county weed district or local applicator for more information.
Habitat Along shorelines, ditches, stream banks, floodplains, forests, areas of shallow water, low-lying wetlands and fish ponds.
Root Extensive root system
Leaf Shape Sword-like with smooth edges
Lifespan Perennial; two years or longer
Priority 2A Weed Common in isolated areas of Montana.
Similar Looking Plants Cattails or Rocky Mountain iris when it is not flowering.
Important Information This plant is currently sold as an ornamental. Each large seedpod can produce 120 seeds. Yellowflag is one of two species of iris known to occur in Montana outside of horticultural plantings; it is the only yellow one.
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