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Eliminating invasive yellow flag iris

Page history last edited by Mary.Ellsworth 9 years, 3 months ago



Yellow flag iris is an invasive ornamental perennial that is a problem in many states and other countries. It will sicken livestock if ingested and is generally avoided by herbivores.


Contact with its resins can cause skin irritation in humans.  If pulling or digging yellow flag care should be used to protect the skin as resins in the leaves and rhizomes can cause irritation.


Because rhizome fragments can grow to form new plants, all rhizome fragments must be carefully removed.  Seeds germinate and grow well even after being burned


Yellow Iris invasive removal

  - adults, with shovels, clippers, long sleeves and gloves.  Resins can cause skin irritation - covering arms and hands is recommended. 






An Invasive Species -  eradicate A native Species -  protect and encourage

Yellow flag Iris  

Iris pseudacorus

Leaves are 0.4-1.2 inches wide and

have a central ridge on both sides of the blades.


Northern Blue Flag Iris   

Iris versicolor

is a native species.  Has tall sword-like leaves that rise from a basal cluster.

Has no central ridge. Flowers may be any shade of purple, but are always

decorated with yellow on the falls.  Grows 2-3 ft. tall.






Source:  Washington State Noxious Weed Control Board




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