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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!

Jump Start Your Garden the Right Way!

On January 28 – a full day of exciting vegetable gardening education especially designed for the beginning gardener and those who need some help with their gardens. Classes are structured to give you the latest science-based information to give you the best possible start on this gardening season. No questions unanswered!

  • Morning Session
    Best Management Practices for Planning This Year’s Garden – Where do you start? Learn the basic planning skills to guarantee a great garden this year whether it is your first garden or you are trying to perfect the one you already have.The Dirt on Dirt – It is estimated that nearly 80% of all garden problems originate with the soil and lack of appropriate preparation. Learn how to avoid problems and develop the best soil possible for the biggest and healthiest harvest ever.
    The 10 Easiest Vegetables to Grow in Colorado – Why not start with the most successful veggies to grow in Colorado? You will not only get a list of the top 10 best, but we’ll tell you how to do it successfully as well as how to share techniques for succession planting to keep it interesting for three seasons.
  • Lunch
  • Lunch and Learn Class (Class requires separate registration on the form – limited space)
    Incorporating Flowers and Herbs into the Vegetable Garden – Add some interest and variety to your vegetable garden by incorporating aromatic herbs and edible flowers to the mix. Learn the best options for Colorado gardens and how to do it successfully.
  • Afternoon Session
    Tomatoes – The Holy Grail – If you only grow one vegetable, make it a tomato! So what are the secrets of growing the best tasting, best producing tomatoes? Are heirlooms better than hybrids? What are the most common things people do wrong? Learn this and more to make your tomato crop amazing!
    Seed Starting or Transplants? – What is best? What is easiest? What’s the difference? Variety? Cost? And the list goes on. What are the best strategies for planting seeds? Come get a great tutorial in starting your garden the best way possible for you.
    Container Vegetable Gardening – Short on space? – no worries. Almost any vegetable can be successfully grown in a container. You will learn container planting strategies to maximize pleasure and production from your small space gardens.
    Cost: $75, includes lunch
    Lunch and Learn an additional $10 per person
    Register NOW! In person, by mail or online at

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. Our “Common Garden and Landscape Problems” page covers plant problems according to the season.

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 during normal business hours: 8 am to 5 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