Giant Knotweed Treatment Project


SCH Number
Public Agency
California Department of Parks and Recreation
Document Title
Giant Knotweed Treatment Project
Document Type
NOE - Notice of Exemption
Document Description
Undertake a multi-year project to remove the invasive, non-native, giant knotweed (Fallopian sachalinensis) from Humboldt Redwoods State Park to aid in the protection of native plants, wildlife, and riparian habitats. Work will involve an Integrated Pest Management (IPM) strategy that will use a multifaceted and adaptive approach that reflects available time and funding, land use goals, and the most effective removal method aimed at full eradication of the giant knotweed. State Parks proposes to use a combination of stem injection and foliar spraying of herbicide. Large, established patches will require multiple treatments over multiple years. Herbicide will be applied using the stem injection and/or foliar spray method. Applications will occur for up to 5 years or until the infestation is eradicated. Stem injection will consist of injecting undiluted glyphosate directly into the hollow stem about 6 inches above ground and below a node. Foliar treatment will consist of applying a combination of Glyphosate (Rodeo) solution and Imazapyr (Habitat). An EPA-approved blue marker dye will be added to the solution to help keep track of which plants have been treated.

Contact Information

Shannon Dempsey
Agency Name
California Department of Parks and Recreation
Contact Types
Lead/Public Agency


Other Location Info
Humboldt Redwoods State Park.
Other Information
Humboldt Redwoods State Park.

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
S: 15304, 15333, Class 4, 33
Reasons for Exemption
Project consists of minor alterations in the condition of land and/or vegetation that do not involve removal of healthy, mature, scenic trees, and consists of restoration that does not exceed five acres in size for plant and wildlife habitat; included as "resource management projects" and "habitat restoration or enhancement projects being undertaken with hand, rather than mechanized, labor" in the Department of Parks and Recreation's list of exempt activities, in accordance with CCR S:15300.4.

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at or via phone at (916) 445-0613.

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