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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.

Plant Diagnostic Clinic   arrow

Jefferson County Plant Diagnostic Clinic

woman looking in microscope at plant sample

The Jefferson County Plant Diagnostic Clinic is OPEN, but is only accepting DROP-OFF and MAIL-IN samples. Please email pictures to with any questions or concerns you may have on plants and/or lawns.

Drop-off Procedure:
Clients can bring completed diagnostic forms (found below, on this page), or complete the forms in our office.  Our office is open 8:30 a.m. to 4:30 p.m., Tuesday through Friday.

Drop-Off station (in office):

  • Fill out data form which is pre-numbered with sample number.
  • Fill out the appropriate colored worksheet.
  • Use the prepared labels as follows:
    • one label on sample (either toe tag or on the bag or box the sample was brought in);
    • place a label on the appropriate colored worksheet; and
    • keep the last label for your records or place it on any other materials brought in like photos.
  • Bring paperwork to the receptionist window for payment.
  • All items will be placed in sample bin upon completion.
  • Clients will be called for follow-up information.

Who We Are

CSU Extension/Jefferson County Plant Diagnostic Clinic consists of paid staff and volunteers with specialized training in plant problem diagnosis. The facility is equipped with microscopes and other diagnostic tools for fungal and bacterial culture; some virus testing and pine wilt nematode detection.

Who We Serve: Everyone!

  • Homeowners
  • Landscape maintenance/consultants
  • Landscape contractors/architects
  • Turfgrass (lawn, golf course, sod growers)
  • Arborists and nurseries
  • Vegetable and herb growers
  • Garden centers

What We Do

  • Identify causes of plant problems including insect, disease and environmental issues.
  • Identify landscape weeds and plants
  • Recommend management strategies for pest problems
  • Identify home lawn problems
  • Help you save money by avoiding unnecessary pesticide applications
  • Provide information on pesticide alternatives

Common Plant Problems of Jefferson County 


Jefferson County Plant Diagnostic Clinic
15200 W. 6th Ave. Frontage Rd., Unit C
Golden, CO 80401-6588
ph: 303-271-6620
fax: 303-271-6644

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.