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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, and our staff are here to help.

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Horticulture Program

This page is your source for horticultural programs and class offerings through Jefferson County Extension.  You’ll also find many links to useful on-line resources!

2020 Master Gardener Recruitment:

A group of Master Gardeners discussing plans for the demonstration gardenColorado State University and Jefferson County Extension will be offering Master Gardener and Colorado Gardener Certificate classes starting January 2020.

If you have an interest in increasing your gardening knowledge and and want the opportunity to join us in 2020, download:

Gardening Help

Master GardenerHave a gardening question?  Call the Master Gardener hotline (303)271-6632 to get personalized help with your specific situation.  You can also email questions and pictures to Master Gardeners from May through September only, at

You can also check our pest update blog for the latest landscape and garden problems reported to us.

Plant Diagnostic Clinic

Jefferson County Extension has an on-site walk-in plant diagnostic clinic staffed by trained personnel   in plant forensics, plant, insect and landscape weed identification.  Before bringing a sample to the clinic, check this link for instructions on the type of sample to collect.

Samples may be dropped off anytime from 8 am until 4:30 pm, Monday through Friday.  We try to complete your diagnosis within 3 business days. Fees apply.


Schedule an appointment now: or 303.271.6620 for a lawn expert to evaluate your lawn and its trouble spots.  Fees apply.

Demonstration and Research Gardens

Plant Select garden

Our two on-site gardens are open to the public. The Plant Select garden offers beautiful displays of water-wise and climate tested plants.  There’s a kiosk in the garden containing information on the plants and their growing requirements.


The Horticulture Research and Demonstration Garden contains on-going studies including blueberry production, apple tree training, tomato and pepper variety trials and innovative vegetable garden season extension tools.  We are also developing an insectary garden to attract beneficial insects.

Web Resources