United States Colorado

• Regional: United States: Colorado: Society and Culture: Organizations 

• Boulder County Master Gardener  - Highlights offered include how to prune shrubs, events and classes, and gardening calendar.
• Colorado Master Gardener Program  - Contains links and information on all aspects of the garden program and it's training courses.
• Denver Master Gardener  - Source for gardening information on trees, shrubs, and grass, plus details for the horticultural courses.
• Teller County Master Gardeners  - Offers a guideline for gardening in the county, low water plants list, and potting mix choices.