Garlic Mustard Containment

Garlic mustard infestation

Garlic mustard infestation

Garlic mustard was discovered in the West Hills of Portland in 2007 by residents around Forest Park and since then, several property owners, volunteer groups and natural resource agencies have come together to combat this aggressive, noxious invasive plant. Regionally, garlic mustard extent is limited. Managed populations are found in the greater Portland Metro and Seattle areas, with only few known occurrences elsewhere in these states.

Within western Multnomah County, garlic mustard population centers are located near Skyline (between Burnside and Newberry Roads) and SW Portland (particularly Council Crest and near Lewis and Clark College). The Conservation District, and its partners, provide free landowner assistance in managing garlic mustard infestations.

Using environmentally-sound integrated pest management approaches, the District has seen good progress in reducing populations and minimizing the spread of garlic mustard. Over 400 properties have been surveyed, and 150 property owners receive annual assistance with control. Currently, less than 30 acres are impacted at project sites, and your help is needed in finding and managing additional unknown patches.

Want to help? Learn what garlic mustard looks like by clicking here, take a weed watchers class (Visit the Weed Watcher page and sign-up when classes become available in the spring), or fill out a Permission to Access form to have your property surveyed by our staff.

Contact our Invasive Species Program Coordinator Michelle Delepine at 503.238.4775, ext. 115 or for more information about the Garlic Mustard Program.