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Colorado State University Extension offices like the one in Jefferson County bring the research and resources of the university within easy reach to our community.

Horticulture Services   arrow

Do you have a garden, bug, or landscape question? We’re here to help!

We specialize in plants, insects/arachnids, and horticultural problems in the Front Range region of Colorado. We receive questions from home gardeners and plant enthusiasts, as well as professionals including arborists, nurseries, garden centers, and greenhouse producers. We also serve landscape professionals and turf specialists who maintain the grounds for HOA’s, golf courses, private lawns, sod growers, and pest control companies. If you have a plant, insect, tree, or lawn problem, we are your local resource to find solutions for healthier landscapes, gardens, and plants!

Online Resources

Online Publications – CSU Extension is chock-full of online publications related to all things horticulture, not limited to topics such as: Vegetables and Herbs, Trees and Shrubs, Water-wise Landscaping/Xeriscaping, and Soils. Publications vary in level of detail – PlantTalk‘s provide the simplest level of detail, whereas GardenNotes and Fact Sheets provide more in-depth information. Feel free to explore the various publications that we offer!

Ask an Expert – Get personalized answers to your horticultural questions from Cooperative Extension staff and volunteers across the country.

CO-Horts Blog – Stay up-to-date on advice and observations from our CSU Extension Horticulture Agents and Specialists.

Jeffco Master Gardeners Blog – Interested in what our local CMG’s have to say? Check out their blog for horticultural tips, information, and updates!

Our Services

Have a Gardening Question? 

Call the Jefferson County Colorado Master Gardener Helpdesk at (303) 271-6632 to get personalized help with your specific situation. You can also email questions and pictures to the Master Gardeners at Phone and email inquiries are free of charge.

Diagnostic Services

CSU Extension Jefferson County plant diagnostic services consist of paid staff and volunteers with specialized training in plant problem diagnosis through visual inspection and microscopy. Commercial samples or samples requiring culturing or advanced diagnostic services should be sent to CSU’s Plant Diagnostic Clinic, located at CSU Spur in Denver, CO. To contact their lab directly, call (970) 491-6950 or email

Our fees (subject to change) are listed as below:

Physical Diagnosis and Identification:

  • Diagnosis: $7/sample, Jefferson County residents; $10/sample, non-resident
  • Plant and Insect Identification: $7/species, Jefferson County resident (additional samples $3 each); $10/species, non-resident  (additional samples $5/each)

Visual Diagnosis and Identification:

  • Diagnosis: No fees
  • Plant and Insect Identification: No fees

CSU Lawncheck

Lawn problems are the number one concern brought to Colorado State University Extension offices in the counties along the Front Range. As a result, CSU Lawncheck, a service that provides onsite assessment of lawns with recommendations for improving the lawn and solving lawn problems, was born.

If you are struggling with lawn issues in Jefferson County, book a CSU Lawncheck visit with us here. One-hour visits are $75 + mileage. You can also email the Horticulture Agent directly with your lawn questions and photos (

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.