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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.

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Have a Gardening Question? 

Call the Jeffco 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/Identification Services

CSU Extension in Jefferson County offers a Plant Diagnostic Help Desk. Formerly known as the Jefferson County Plant Clinic, the volunteers and staff that run the Diagnostic Help Desk have specialized training in identifying plant diseases and insects. To contact the help desk for questions or to get virtual help with diagnosis or identification, email: or call: (303)271-6627. Our services and their fees are summarized below:

Diagnostic ServicesFees for Jefferson County ResidentsFees for Non-Residents
Plant Diagnosis$20$30
Plant Identification$15$25
Insect Identification$10$20
Virtual Diagnosis or Identification
(via photos/email)
Anything our plant diagnostic team cannot identify will be sent to the State Plant Diagnostic Clinic at CSU SPUR, with client consent. Any testing done by SPUR will be an additional cost.

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

For information about how to submit a sample, please refer to this document.

If you’d like to fill out our forms ahead of time, you can access them below.

For plant samples, use the Plant Sample Submission Form

For insect samples, use the Insect and Arthropod Submission Form

For turf samples, use the Turfgrass Submission Form

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.