Colusa County
University of California
Colusa County

Master Gardeners


 Science based solutions for Colusa County's gardening communities.

The UCCE Master Gardeners of Colusa County volunteer's donated 834 hours and made 1191 face to face contacts in 2017/18.

Since 2009, we have volunteered 5,798 hours and made 11,447 face to face contacts in Colusa County.


This is what we do!

Click here for a short video!



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

UC IPM website


April in the Garden

What to plant?

  • In a shady spot early in the month you can still plant pansies, violas, and primroses.
  • You can plant dahlia tubers and transplant most perennials.
  • As temperatures warm (nights consistently over 55 degrees) you can transplant tomatoes, eggplants and peppers.
  • You can still plant seeds of cilantro, radishes, beets and chard. (Cilantro will go to seed quickly as the weather warms up.)



  • Fertilize shrubs and trees once this spring.
  • Watch azaleas and camellias for yellowing between the veins in the leaves. If the leaf is yellowish, apply chelated iron to the plants.
  • Trim the dead flowers but not the leaves from spring bulbs. The leaves restore the bulb; so wait to remove them until they turn yellow. Fertilize the bulbs after the bloom is finished with bone meal.
  • Apply organic mulch to all beds to keep the soil cool and enrich the soil.

Asian Citrus Psyllid

Asian Citrus Psyllid is an insect that carries a devastating disease in Citrus trees and there is no cure. The insect and disease is usually detected in home citrus first. Click here to read more about the Asian Citrus Psyllid and the Huanglongbing disease.

The Asian Citrus Psyllid has been found in San Joaquin County.

Click here to read about the Asian Citrus Psyllid from the UCCE Master Gardeners of San Joaquin County.

Click here for Spanish


UC Master Gardeners of Colusa County

100_2419 (2)


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


Make an Online Gift to UC Master Gardeners

Find us on Facebook



Event Name

Garden Advice and Workshops

Second Saturday at the Library

10 to noon

Colusa Library

Garden Chat with the Master Gardeners

Last Tuesday of the month

1-2 pm

Arbuckle Library

Colusa County Family Fair

Saturday April 13, 10 to 1 pm

Egling Middle School, Colusa

Plant Clinic

Friday April 19, 10 to 2 pm

Griff's Feed and Seed, Colusa


Virginia Read MG events

*Tuesday April 23, 6 pm

Colusa County Library, Colusa

*Saturday April 27, 1 pm

Rocco's Banquet Hall, Main Street, Colusa

Master Gardener Blog

Art Shapiro: 'Butterflies as Heralds of the Apocalypse'

A newly emerged anise swallowtail, Papilio zelicaon, spreads its wings on anise, its host plant, in Vacaville, Calif. (Photo by Kathy Keatley Garvey)

Butterflies, beer and a bar...Who wants to drink to science? If you've ever wanted to converse with butterfly guru Art Shapiro, UC Davis distinguished professor of evolution and ecology, about "butterflies and the  apocalypse" and sip a beer (or...

Posted on Thursday, April 4, 2019 at 4:07 PM
Focus Area Tags: Environment,Innovation,Natural Resources,Yard & Garden

Yes, I'll Have Some Mustard, Please!

A pollen-laden honey bee heads for more pollen and nectar on mustard. (Photo by Kathy Keatley Garvey)

Yes, I'll have some mustard, please. Yes, both the pollen and the nectar, thank you. We watched a honey bee buzz into our little mustard patch,  her proboscis (tongue) extended, and pollen weighting her down. If she were at the airport, someone...

Posted on Wednesday, April 3, 2019 at 5:35 PM
Focus Area Tags: Environment,Family,Innovation,Natural Resources

Congrats, UC Linnaean Games Team!

In a scene from the 2018 national Linnaean Games championships, Brendon Boudinot answers a question. Team captain Ralph Washington Jr. looks on. (ESA Photo)

Congrats to the University of California Linnaean Games Team! They know their insects! The UC team, which swept the national championship last year, just won the regional competition Monday night at the Pacific Branch, Entomological Society of America...

Posted on Tuesday, April 2, 2019 at 5:05 PM
Focus Area Tags: Agriculture,Environment,Innovation,Natural Resources,Pest Management
Webmaster Email: