Hero Image

Master Gardeners

All UC Master Gardener Program of Colusa County events are canceled

All events are canceled.

We hope to be back in business eventually. In the meantime you can call our office at 458-0570 if you have a gardening question.

You can also check us out on Facebook!

Garden on!

Stay safe and thank you!


 Science based solutions for Colusa County's gardening communities.

The UCCE Master Gardeners of Colusa County volunteer's donated 705 hours and made 736 face to face contacts in 2018/19.

Since 2009, we have volunteered 6,475 hours and made 12,154 face to face contacts in Colusa County.


This is what we do!




Need help identifying insects and how to get rid of them? The UC IPM (Integrated Pest Management) has answers!

UC IPM website


Water Trees First

TRIC lawn

Our trees are the most important garden asset. They provide shade, clean the air, provide habitat for wildlife, they are beautiful and increase your property value.

A new way of irrigating trees have been developed by the University of California. As you see in the picture you will circle the tree with a drip line or soaker hose to the edge of the canopy. You can purchase supplies at your local garden center or hardware store.

To get the deep watering need for trees, you will need to run the drip line for several hours but only irrigate every 2-4 weeks. The water needs to penetrate the soil about 2-3 feed deep.

For more information from the California Center for Urban Horticulture, click here.


September in the Garden

What to plant:

  • Cool-Weather annuals like pansies, violas, snapdragons can be transplanted now.
  • Also, transplants of broccoli, cabbage, cauliflower, and kale can be planted this month.
  • Direct seed peas, spinach, radishes, lettuce, and carrots.


September Chores:

  • September is a good time to consider reducing the size of your lawn. It is also a good time to rejuvenate a lawn with over-seeding.
  • Put your spent annual and vegetables (disease-free, of course) in your compost pile.
  • Add compost to the beds that had the annuals and vegetables you are pulling out, before re-planting in those beds.



This is also the month to dig, divide, and re-plant overgrown perennials that have finished blooming. Be sure to clear out any weeds that developed in the perennial bed.

UC Master Gardeners of Colusa County



The University of California Master Gardener Program provides the public with UC research-based information about home horticulture, sustainable landscape and pest management practices. The program is administered by local University of California Cooperative Extension (UCCE) county offices that are the principal outreach and public service arms of the University’s division of Agriculture and Natural Resources.

The UC Master Gardener program supports sustainable gardening practices that protect the environment, conserve natural resources, and take into consideration each gardener's lifestyle and goals.


What do UC Master Gardeners do?

UC Master Gardeners are trained to help residents of California become better gardeners. Using a variety of activities such as workshops, lectures, and garden hotlines these volunteers answer questions about home horticulture, sustainable landscaping, and integrated pest management using University of California research-based information.

After their training UC Master Gardeners are qualified to help the public with problems in areas such as:

  • Weed Control
  • Plant Problem Diagnosis
  • Integrated Pest Management (insect and pest control)
  • Soils, fertilizers and irrigation
  • Selecting and caring for fruit and landscape trees
  • Growing annuals, perennials and food crops
  • Lawn care
  • Vegetable Gardening
  • Plant Pathology
  • Composting


Each county develops programs to address local needs. Some typical activities are:

  • Using mass media to disseminate gardening information
  • Teaching workshops, or lecturing on gardening practices
  • Participating in research activities with academics within UC
  • Answering gardeners’ questions via email or helplines
  • Speaking to the public on horticultural and gardening topics
  • Manning county fair information booths
  • Consulting with gardeners to improve their landscape practices


Find us on Facebook

Event Name Date
Master Gardener Blog
  • This the cover of second-grader Greg Kareofelas booklet on monarchs. He now serves as an associate at the Bohart Museum of Entomology, UC Davis, and as a tour guide for non-profit organizations.
    Why We Need to Teach Science in Elementary School

    Two adults, apparently not science aficionados, recently asked me: "What is entomology?" Quick answer: insect science. "What is a monarch?"Quick answer: An orange and black butterfly that's the icon of the butterfly world.  Science....

    By Kathy Keatley Garvey
    Author - Communications specialist
  • The Egg: Greg Kareofelas collected this egg from a narrowleaf milkweed in his Davis yard on Aug. 25. (Photo by Greg Kareofelas)
    A Monarch Named Ruth

    When a monarch butterfly fluttered into the Davis garden of naturalist Greg Kareofelas and laid an egg on his narrowleaf milkweed, it marked the beginning of a story that ended with the flight of Ruth.  Usually the life cycle--from egg to...

    By Kathy Keatley Garvey
    Author - Communications specialist
  • A honey bee nectaring on African blue basil blossoms is unaware that on the other side, camouflaged and hidden in the shadows, is a praying mantis. (Photo by Kathy Keatley Garvey)
    The Honey Bee and the Praying Mantis

    So I'm a praying mantis and being a top-notch real estate developer, I've located the best place in the pollinator garden. I have acquired the proper plans and permits to orchestrate complete control over the property. Ah, the fragrance of the African...

    By Kathy Keatley Garvey
    Author - Communications specialist