Weed Alerts
Linked to each photograph is a Mason County Weed Alert that contains: identification tips; biology; impacts; distribution; and control methods.
We are currently updating contact information on weed alert brochures. For any questions regarding noxious weeds in Mason County, email us.
Noxious Weeds
As a Mason County landowner, you might have one (or many) noxious weeds that are causing you concern, or that you may be legally required to control. For a full list of noxious weeds in Mason County, please refer to the 2022 Mason County Noxious Weed List. Below is a list of selected high priority or common weeds that all occur in Mason County.
Butterfly Bush Weed Alert
Canada Thistle Weed Alert
English Ivy Weed Alert
European Coltsfoot Weed Alert
Fragrant Water Lily Weed Alert
Giant Hogweed Weed Alert
Hanging Sedge Weed Alert
Himalayan Blackberry Weed Alert
Herb Robert Weed Alert
Knapweeds Weed Alert
Knotweed Weed Alert
Lesser Celandine Weed Alert
Pampas Grass Weed Alert
Perennial Pepperweed Weed Alert
Poison Hemlock Weed Alert
Policeman’s Helmet Weed Alert
Purple Loosestrife Weed Alert
Scotch Broom Weed Alert
Spurge Laurel Weed Alert
Tansy Ragwort Weed Alert
Yellow Archangel Weed Alert
Yellow Flag Iris Weed Alert
“Weedy” Native Plants
Noxious weeds are never plants native to this region. Some native plants are considered “weedy” because they can colonize disturbed sites or they spread aggressively. Some native plants pose health risks to humans and livestock. For these reasons, MCNWCB educates the public on the below selected native plants.
Poison Oak Weed Alert
Bracken Fern Weed Alert
Weeds of Concern
There are numerous plants that the public considers weedy, especially in garden environments, that are not considered noxious weeds. There are also some plants that are on the WA State Noxious Weed Control Boards Monitor List. Monitor list plants are suspect weeds that are monitored for occurrence and spread. Noxious weed control programs are allowed to educate and encourage control of these species. Below are selected Weeds of Concern in Mason County.
Creeping Buttercup Weed Alert
ArcGIS Noxious Weeds Mapping
Curious where a particular noxious weed is found in Mason County, or what may be found growing in your area? Noxious weed control staff survey for infestations across the county and upload their findings to WSDA’s ArcGIS Noxious Weed Data Viewer.
This map is frequently updated. It does not give specific location detail.