• Oahu 1


Oʻahu Master Gardener Coordinator


Kalani Matsumura
Junior Extension Agent
email: kalanitm@hawaii.edu

University of Hawai'i CES
Urban Garden Center

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

Oʻahu Urban Garden Website:

Oahu Events

«October 2021»


Got a Plant Question?

The UH Master Gardener program is an offical Volunteer program of the University of Hawaiʻi Cooperative Extension Service. We are dedicated to disseminating local, research based information to assist home gardeners in decisions that affect themselves, our neighbors and our local and global environment.  So much information about gardening in Hawaiʻi is located in Tropical Topics. Enjoy exploring the wealth of information that we have to share with you.

If local information is not available on your subject, we are trained to find research based information and other reliable sources of information, so please contact us with your questions.

Thank you for contacting us with your questions!  We believe that no questions are the worst questions. With so much beauty and diversity in Hawaiʻi, we have a BIG responsibility to have the right tools and correct information to protect our environment and we want to help your garden thrive.

Submit a question through E-mail: OahuMG@ctahr.hawaii.edu

Important information to include is the name of your plant and the symptoms that you are observing. We love pictures! If you are sending a picture through email, please include a close-up of the problem area as well as a picture of the entire plant. This will help us diagnose your problem or identify your insect.

Oʻahu Gardening Questions

Find Us to talk story about your garden or submit a plant or insect sample at your local Farmers Market.

You can also Find Us to talk story about your garden or submit a plant or insect sample at Second Saturday at the Garden! program every month on the 2nd Saturday of each month.

NEW!  Recent Change to our UH Urban Garden Center Plant Helpline Walk-in Hours starting March 1, 2017. 

We will be staffing our Helpline at the UH Urban Garden Center on Wednesdays, 9am-12pm.  This service was previously open Monday – Friday every week throughout the year.  We are now transitioning to being more present in your local community and we are receiving increased questions by email. To respond to this change, we have updated our Plant Helpline and Walk-in times. This service is now available each Wednesday, 9am-12pm, except holidays.

Stay tuned for Plant Helpline and office hours located in Waimanalo and Manoa! Contact Kalani Matsumura at kalanitm@hawaii.edu for more information.

Like the Oʻahu Master Gardeners on Facebook.

Join Us!

We are trying to grow our volunteer program and we invite you to join us. The UH Master Gardener Program on O'ahu hosts its introductory training class every Friday (except holidays), 9AM -12PM from January 2019 – May 2020. Please click on the link below to view our invitation and read through our program requirements. This program depends on your volunteer commitment. If accepted into the program as a volunteer of the University of Hawai‘i Master Gardener Program, you will sign a contract with us to fulfill 50 volunteer hours within the first year of completing the training course (June 2019-May 2020).

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
  • Haleiwa Farmers Market, Third Thursday of the Month
  • Pearl Ridge Farmers Market (near Sears), Third Saturday of the Month
  • Wai'anae Farmers Market, First Saturday of the Month
  • Windward Mall Farmers Market, First Wednesday of the Month

Educational Outreach

Oʻahu 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


Oʻahu Gardening Questions

Plant or Problem ID

  • FIND US at Educational Outreach events
  • VISIT in person
    WEDNESDAYS 9am-12pm at the UGC

Second Saturday at the Garden!

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

Other Questions

  • Speaker Request
  • Booth Request
  • School Garden Request