University of Hawaii at Manoa
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Hawaiian islands, focus on Oahu

Oʻahu Gardening Questions

Plant or
Problem ID

Second Saturday at the Garden! 

Visit our UGC website for monthly gardening topics and educational workshops.

Other Questions

Master Gardener Coordinator

Jayme Grzebik

Jayme T. Grzebik
[on sabbatical]


Kalani Matumura

Kalani Matsumura
Junior Extension Agent


University of Hawai'i CES
Urban Garden Center

955 Kamehameha Hwy.
Pearl City, HI 96782-2501
Phone: (808) 453-6059
Fax: (808) 453-6052



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Plant Doctor

Oʻahu Master Gardener Program

Located on the island of O’ahu with administrative offices at the University of Hawaii, Manoa, the O’ahu Master Gardener program operates out of the UH Urban Garden Center (UGC) in Pearl City.  We answer plant questions, provide hands-on training opportunities, maintain garden displays and conduct public demonstrations at this 30-acre garden.

Training program at Second Saturday at the Garden

Plant Helpline

The UH Cooperative Extension Service and the UH Master Gardener program is dedicated to disseminating local, research based information promoting sustainable practices that affect ourselves, our neighbors and our local and global environment. Many UH CTAHR publications are available to the public for free, accessible by our searchable database.

If there is not a UH publication available on the subject you are interested in, we are trained to find research based information and other reliable sources of information. 

Our Plant Helpline is available for calls or walk-ins 9AM-12PM, Monday – Friday. Our office is closed on holidays.

Master Gardener Class

Join Us!

Master Gardeners are dedicated volunteers who disseminate researched based information to the public. We invite you to join us! We conduct a training class for new Master Gardeners every year, from January to end of May. We meet at the UGC Classroom 9AM -12PM, each Friday for 16 weeks. Click here for an invitation and instructions on how to be added to our application mailing list.

Visit us at your local Farmers Market!

Bring your home gardener question to our “Got a Plant Question” Booth at your local farmers market! Purchase UH Vegetable Seeds for your home garden!

Tips: When bringing plant samples with suspected plant disease be sure to bring new leaves AND old leaves, include flowers or fruits that show symptoms. Dead leaves or rotting fruit does not allow us to see all the symptoms of the problem! Pictures of the garden or plants showing stress is encouraged! Please read here for more information: Collecting Plant Disease and Insect Pest Samples for Problem Diagnosis.

Kapiolani Community College Last Saturday of the Month
Farmers Market at Windward Mall
by Nalo Farms
First Wednesday of the Month
Haleiwa Farmers Market Third Thursday
Pearl Ridge Farmers Market
(near Sears)
Third Saturday of the Month
Wai'anae Farmers Market First Saturday of the Month

Second Saturday at the Garden

Educational Outreach

Oahu Master Gardeners are reaching out to home gardeners, school garden educators, elementary school students, and plant industry professionals! Click the links below to find out more!

Do you have a request for a Gardening Presentation for your local organization taught by a UH Master Gardener?  Please request at least 1 month in advance via our on-line form.

Annual Events where you can find “Got a Plant Question” Master Gardener booths

Master Gardener Education Program at Urban Garden Center