Horticulture services
Need help with your landscape, yard, or garden? Jefferson County Extension can help.
Diagnostic help desk
As of August 15, 2025, the Jefferson County Diagnostic Help Desk is closed for the season and no longer taking samples.
The CSU SPUR Plant Lab is still available for diagnostic needs.
Do you have a horticulture question? Please reach out to our Master Gardeners.
If you do not have access to email, please contact us via our web form.
Soil testing Info
Soil testing services are provided by the CSU state lab. Jefferson County no longer provides testing kits. Please place your soil in a plastic or waterproof paper bag. Once you have filled out and printed your submittal form, include it with your sample and mail or deliver to:
CSU Spur Soil, Water and Plant, Testing Lab, Room T-316
4780 National Western Drive
Denver, CO 80216
Visit the CSU Soil Testing Lab for more information.
Lawncheck
Lawn problems are the number one concern brought to Colorado State University Extension offices in the counties along the Front Range. As a result, CSU Lawncheck, a service that provides onsite assessment of lawns with recommendations for improving the lawn and solving lawn problems, was born.
If you are struggling with lawn issues in Jefferson County, book a CSU Lawncheck visit with us. One-hour visits are $75 + mileage.
Ask Extension Colorado
Real answers from real Extension experts.
Do you have a specific question about gardening, pests, landscaping, food safety, or another topic? Ask Extension Colorado connects you with subject-matter experts who provide reliable, research-backed answers.
Submit your question online and get help straight from CSU Extensions experts and trained volunteers or browse the Ask Extension knowledgebase.