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!
Have 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 firstname.lastname@example.org.
You can also check our pest update blog for the latest landscape and garden problems reported to us.
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.
Demonstration and Research Gardens
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.