Hi Pat,

Thank you for using the hotline! Yellow flag iris is one of our priority weed species in the Tualatin Basin. It is very invasive and is detrimental to aquatic systems and native plants/wildlife. I have seen the yellow flag iris at Dawson Creek Park as well. The species seems to be used often in landscaping. Unfortunately, the landowner must agree to control the iris. This is difficult in these business park situations where iris was incorporated into the landscape. However, we can continue to create awareness of this species so residents throughout the Tualatin Basin know about its harmful effects. Again, thank you for your report!

Sincerely,
Lacey Townsend, Tualatin Soil and Water Conservation District

Lacey Townsend
July 17, 2013, 7:45 a.m.