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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 will only be accepting DROP-OFF and MAIL-IN samples during June. 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 forms at the sample drop-off station in our office lobby.

Drop-Off station (in office):

  • Fill out data form pre-numbered with sample number. Tear apart form: customer keeps white form.
  • Fill out appropriate worksheet. Copy sample number from data form onto toe-tag label (labels provided in lobby).
  • Place paperwork (yellow copy of data form, plus worksheet) in large envelope (provided in lobby).
  • Put sample and paperwork in trash bag (provided in lobby)
  • Tie bag with toe-tag.
  • Place bag in sample bin. Clients will then enter the office one-at-a-time and show the front desk the white copy of the data form for billing.
  • Client retains white copy.
  • 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 West 6th Avenue, Unit C
Golden, CO 80401-6588
ph: 303-271-6620
fax: 303-271-6644
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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.