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The Extension office provides assistance and programs for the community without discrimination in five main areas: Agriculture, Horticulture, Family & Consumer Science, Natural Resources and 4-H Youth Programs.

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Horticultural Services

Due to the COVID 19 outbreak, Boulder County has closed our offices to the general public. CSU Extension staff will be working remotely at this time. If you have questions about HOA or Green Industry site visits, please contact Deryn Davidson by email ***Plant and insect sample ID and diagnostic services are currently suspended. We apologize for the inconvenience.***

Ask a Master Gardener

Our volunteers are out of the office, but are still able to help you with your home gardening questions by email! Send us your detailed questions and any relevant photos of the problem plant to us at

We’re here to help, even when we’re working remotely!


Let’s Grow Together

­ Grow & Give – Colorado Master Gardener

Learn to grow food and donate extra locally. The resources in this link are designed to help you grow your own food this year and beyond. You got this, Colorado! Colorado State University Extension & Master Gardeners are here to help every step of the way. More resources are added weekly and will change with the season. Learn more about the history of victory gardens.

Your information source for gardening and horticulture related programs and classes through Boulder County Extension.

For additional information on gardening, link to Planttalk Colorado below AND see Online Publications.

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Native Plant Master
Learn about the values and characteristics of Colorado’s native plant species, as well as issues surrounding non-native, invasive plants.
Harvest of peppers
Community Garden
There is a community garden located at the Boulder County Extension office.  The garden consists of several dozen plots that can be rented by community members who are in need of a place to garden.
Demo Garden
Demonstration Gardens
The Boulder County Extension office is home to several demonstration gardens. Visit the Plant Select, Rock, Hell Strip, Rain Garden, Grass Plots and Native Gardens. All of the gardens are located around the Natural Resource Building on Boulder County’s Fairgrounds in Longmont, Colorado.
Yellow flowers
Boulder County Master Gardener Program
The Colorado Master Gardener program has played an active role in the education of Boulder County gardeners for more than 35 years.
Hand holding soil and seedlings
Horticulture Services
Dig in! Get green industry and gardening help from your local Boulder County Extension office. We offer consultation services including site visits, plant ID, disease diagnosis, and garden problem solving help.

PlantTalk Colorado

Planttalk Colorado™ is sponsored by Colorado State University Extension, Denver Botanic Gardens, and the Green Industries of Colorado. Link to Planttalk for information on over 500 horticulture topics from Colorado horticulturists and professionals.

Timely PlantTalk Videos

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Bee Good to Bees by LuAnn Aiken of Tagawa Gardens

Pollinator Habitat by Deryn Davidson, Boulder County Extension

Growing Herbs by LuAnn Aiken and Kris of Tagawa Gardens

Renovating a Lawn by Reseeding by Carol O’Meara, Boulder County Extension

Cytospora Cankers by Alison O’Connor, Larimer County Extension

Planttalk Colorado – Espanol

Keeping ahead of COVID-19

This rapidly evolving coronavirus (COVID-19) has imposed an unsettling, fluid situation upon our community and its businesses. While the team here still aims to maintain a “business as usual” approach, we are making a number of significant changes to our operations to account for a situation that is far from normal.