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 802 hours and made 1458 face to face contacts in 2014/15.


This is what we do!

Click here for a short video!


May in the Garden

What to plant?

  • Direct seed in the garden cucumbers, melons, summer squash, beans, corn, and annual herbs.
  • Plant sunflowers, zinnias, cosmos, marigolds and aster in the flower garden.


  • Fertilize summer blooming flowers early in the month.
  • Apply (or re-apply as needed) organic mulch to all beds to keep the soil cool and enrich the soil. Be sure to leave space around the base of 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.
  • Later in the month prune spring flowering shrubs to shape, removing old and dead wood. The plants flower on the growth that happens during the summer; do not prune in the fall or winter or you will have no flowers on the shrub.
  • Continue the battle against slugs and snails.
  • Deadhead (cut off spent flowers) to get continuing bloom on annuals and perennials.
  • Thin peaches, plums and nectarines so there is 6” between fruits.

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

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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


Garden Advice and Workshops


Join us at the Colusa County Fair!

June 9-12

Etchepare Hall

Colusa Farmers Market

June 2, evening

Memorial Park, 10th & Market

Arbuckle Farmers Market

June 15, evening

Downtown Arbuckle


Featured Plant


California fescue


Medium size

California native




Master Gardener Blog

A Butterfly Ballet at a Special Place

The Western tiger swallowtail (Papilio rutulus)sips nectar from a butterfly bush in the Storer Garden, UC Davis Arboretum. (Photo by Kathy Keatley Garvey)

Ruth Charlotte Risdon Storer (1888-1986) would have been proud. The garden that bears her name in the UC Davis Arboretum is Nature at its Best, especially this time of year. It's better known as the Storer Garden, but a plaque spells out the entire...

Posted on Friday, June 24, 2016 at 6:18 PM

Protecting pollinators around the home and garden

Adult honey bee.

In observance of National Pollinator Week, we thought we'd share how you can manage pests around your home, garden, and landscape and still protect pollinators. Natural enemies (predators, parasites, and pathogens) reduce pest populations and help...

Posted on Friday, June 24, 2016 at 10:52 AM
Tags: bees (25), control (6), fly (11), honey bee (175), IPM (33), management (5), national (1), natural enemies (3), pest (21), pollinator (5), protect (2), protection (1), UC IPM (50), week (1), Windbiel (2)

Cover Girl

Cover Girl! Cover of the Journal of Economic Entomology shows an image of a worker bee heading toward a tower of jewels, Echium wildpretii. (Photo by Kathy Keatley Garvey)

If any insect should be the "cover girl" during National Pollinator Week, it ought to be the honey bee (Apis mellifera) Specifically, it should be the worker bee, although the queen bee and drones (males) have their place, too. But it's the worker bee,...

Posted on Thursday, June 23, 2016 at 5:55 PM
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