Gardening & Horticulture
The CSU Extension Horticulture program is the go-to resource for science-based information on your yard, garden, landscape, trees, plants, and insects in Arapahoe County.
Arapahoe Master Gardeners
In Arapahoe County, a dedicated group of approximately 120 Colorado Master Gardener (CMG) volunteers serve nearly 7,000 residents annually by answering questions and providing gardening education. We are committed to using horticulture to empower gardeners, develop partnerships and build stronger communities.
Demonstration/Community gardens
Explore the network of gardens across Arapahoe County, made possible through the dedication of Arapahoe Master Gardeners and strong community partnerships. These spaces showcase research‑based practices, provide hands‑on learning opportunities, and demonstrate sustainable gardening in action.
Plant & Insect Diagnostic Services
Arapahoe County Extension’s professional horticulture staff and advanced Colorado Master Gardener volunteers provide sample analysis for a small fee to help homeowners, commercial growers, crop consultants, and golf course crews. Our sample analysis can help you to:
- Identify causes of plant, turf, tree and shrub problems
- Diagnose diseases or pest problems
- Find safe and effective control measures
- Receive information on pesticide alternatives or non-chemical controls
Lawn and Landscape Diagnostic Site Visits
Arapahoe County Extension’s professional horticulture staff can provide on-site lawn, tree and landscape site visits for a small fee to help with identifying and solving insect, disease and other lawn problems.
Upcoming Horticulture events
Native Plants are Imaginary
Online
Weeds
In Person
Silo Park
What’s “Bugging” your Garden
In Person
Hudson Gardens Demonstration Vegetable Garden
Composting
In Person
Clayton Elementary Community Garden
Lawn Care Tips
In Person
Aurora Central Library
Pollinators in the Garden
In Person
Pea Patch CMG Demo Garden
Gardens of Distinction
In Person
Arapahoe County Extension Office
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.