Hero Image

Master Gardeners

All UC Master Gardener Program of Colusa County events are canceled

All events are canceled through May 31. This includes:

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

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.


June in the Garden
  • In the flower garden you can still plant seeds of marigolds, zinnias, cosmos and sunflowers. You can set out transplants of perennials like yarrow, verbena, black-eyed Susan, and dahlias.
  • In the vegetable garden you can plant seeds of pumpkins, squash, and corn.
  • Be sure to water early in the day to conserve water and minimize plant disease. Regularly check your sprinklers and drip emitters for needed repairs and adjustments. Monitor soil moisture in hot weather to be sure you are irrigating enough. (Use a metal rod to push into the ground. If it goes in easily, the soil is moist.)
  • Fertilize summer blooming flowers early in the month. Later in the month use a fertilizer for acid-loving plants like azaleas and camellias. Always follow the directions for proper dilution of concentrates.
  • Dig and divide spring-flowering bulbs when the tops have died down.
  • Before the full heat of summer arrives mulch your beds to control weeds and conserve moisture.



For information on insect control visit www.ipm.ucdavis.edu

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