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The City of Portland, Oregon

Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Ave, Suite 613, Portland, OR 97204

More Contact Info

Invasive Plant Profiles

Yellow Flag Iris

Also known as water flag, common iris, and yellow iris

Tree of Heaven

Also known as Chinese sumac and stinking sumac

Purple Loosestrife

Also known as spiked loosestrife, rainbow weed, purple lythrum, and salicaire

American Pokeweed

This plant is poisonous and invasive

Parrot Feather

Also known as Brazilian watermilfoil and parrot feather watermilfoil

Japanese Knotweed

Also known as Mexican bamboo

Garlic Mustard

Also known as hedge garlic, sauce-alone, jack-by-the-hedge, poor man’s mustard, jack-in-the-bush, garlic root, garlicwort, and mustard root


Also known as sweet fennel, anise, and finnochio

English Ivy

Listed as noxious weed and quarantined by the Oregon Department of Agriculture


Also known as Traveler’s Joy and Old Man's Beard

Butterfly Bush

Also known as summer lilac and orange-eyed butterfly bush