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Washington State University

WSU Snohomish County Extension office has moved!

Our office is now located in the Snohomish County Parks & Recreation Administration Office at Willis Tucker Park, 6705 Puget Park Drive, Snohomish, 98296.

Horticulture Professionals


Commercial Diagnostic Services

You may send commercial samples for diagnosis directly to the WSU Puyallup Plant Clinic and Diagnostic Laboratory. We no longer have a professional diagnostician on staff and WSU regulations do not allow Master Gardeners to answer commercial diagnostic questions.

Private Pesticide Applicator License

Information about pesticide applicator licensing is available from the Washington State Department of Agriculture. Study materials may be purchased at our office and some of the exams are also given at our office. Review the schedule and then call 1-877-301-4555 to make an appointment.

Horticultural Professional Training

Horticulture Professional Training that is offered in conjunction with annual Master Gardener Training will has ended for 2023. Information for the 2024 class will be available on the “Become a Master Gardener” page in late summer/early fall.