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Coronavirus COVID-19

COVID-19 Advisory: WSU Extension is working to keep our communities safe. All Extension programming is being provided virtually, postponed, or canceled. Effective March 16, 2020, WSU Extension county offices and WSU Research & Extension Centers will be closed to the public. We are available via email, phone, and webconference.

Become A Master Gardener

Program Contact: Mary Watts, KCMG Program Coordinator
206-543-0943 •

Annual Master Gardener Training

Due to the impacts of the COVID-19 pandemic the Master Gardener Program of King County will not be conducting training for new Master Gardeners in 2021. We do expect to accept applications in late 2021 for the 2022 training year.

Becoming A Master Gardener

Have you always wanted to learn more about gardening, have more of a science-based knowledge of gardening, meet new people and make a difference in the community? Then, the WSU Master Gardener Program might be right for you.

Master Gardeners are community educators trained to work in partnership with Washington State University (WSU) Extension to educate the public and enhance the quality of life in communities by promoting science-based gardening practices.  Master Gardeners provide gardening advice to the public at plant clinics, demonstration gardens and other outreach activities.

The Master Gardener program was started by Washington State University Extension in King and Pierce counties in 1973 and has since been adopted in all 50 states and parts of Canada.  Last year King County Master Gardeners donated over 44,000 hours of volunteer time at plant clinics, demonstration gardens, plant sales and other program activities.

Becoming a WSU Master Gardener starts with a 12-week training course that includes both classroom and online elements.  Email and internet access are required.  The textbook for the online course is the WSU Master Gardener Manual, a 25-chapter, 640-page publication that includes photographs and diagrams on such topics as basic botany, soil science, fruit and vegetable gardening, pruning, composting, landscape plants and entomology.

Completion of the online course includes multiple choice, open-book quizzes as well as an open-book final exam.  A passing score on the multiple-choice quizzes is 80% or better.  Time spent each week in the online portion of the class varies by student, but 3+ hours should be expected.  The in-person classroom portion of the course includes presentations from WSU and other local gardening experts on science-based gardening, plant problem diagnosis, Integrated Pest Management (IPM) and other topics specific to gardening in the Puget Sound region. You will become familiar with resources Master Gardeners refer to when advising the public.  A key element of training is becoming familiar with these materials.

Successful applicants to the Master Gardener program have an interest in and enthusiasm for volunteer work, enjoy talking to people about gardening, and a strong desire for continuous learning.  Applications are generally available August 1st for the following year’s class and are due from October 15 to October 31.  Applications will be processed in the order received, and there are usually more applicants than space allows.

Typically, the training is held at the Center for Urban Horticulture in Seattle. Some years, the training is offered at the WSU King County Extension office in Renton. Classes are held on 12 consecutive Saturdays, January through March, 9:00AM to 3:00PM. Attendance at each of the 12 Saturdays is required, as well as the successful completion of the online training.  The primary mode of communication outside of the classroom is via email.  Access to a printer is helpful but not required.

For the first calendar year, successful trainees are considered “Interns” and must complete 40 hours of volunteer time, including at least 5 plant clinic shifts (each shift is 3-5 hours), at least 2 demonstration garden shifts (shift length is flexible) and at least 1 shift at one of the county plant sales (2-3 hours in April/May).  After successful completion of the first year requirements, ‘interns’ graduate to ‘veteran’ status.  Veteran Master Gardeners must be recertified each year. Recertification requirements include 25 volunteer hours (in King County Master Gardener activities of their choice) and 10 hours of continuing education (in-person or online training on topics relevant to gardening in the Pacific Northwest).

Cost for the training in 2020 was $375, including $75 to WSU for the online portion (which includes online access to the textbook/manual and quizzes).  Cost for training in future years may vary. Please do NOT send payment with your application – that will be due upon your acceptance into the program.  If cost is a financial hardship, a limited amount of financial assistance is available – please contact the King County Master Gardener program office and a financial assistance form will be emailed to you.  Phone: 206-543-0943  Email:

For additional information, please visit the statewide website at:  WSU Master Gardener Program




Feature image by Jupiter Images


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