Tree ID and Selection

Discover the power of trees. Whether you're a beginner, a seasoned gardener, or simply a tree lover, this two-session course invites you to explore the beauty and importance of Colorado’s urban and native forests. Learn how trees support life—cleaning air, filtering water, storing carbon, and providing habitat—and gain practical skills to identify, care for, and protect them in your community. Includes reference materials for Colorado tree ID.

Session 1:Tree Selection, Planting & Care

Explore how to choose the right tree for your landscape, with a focus on native species and science-based planting techniques. Learn how to avoid common urban tree problems caused by poor planting practices and discover top recommendations for Front Range landscapes.

Session 2:Tree Identification

Discover the importance of native trees in our ecoregion and learn how to identify them using taxonomic terminology and tools. Practice tree ID in class guided practicum, then head outdoors to apply your skills on a live specimen. Get familiar with the best resources for identifying Colorado trees.

“A single tree can be home to hundreds of species of insect, fungi, moss, mammals and plants.” - The Arbor Day Foundation

This course meets 3 elective credits in the Rocky Mountain Gardening Certificate Series

Price: $100, $85 member

Location: York Street

Instructor: Patti O'Neal

Patti O'Neal is a horticulturist with a background in nutrition. She is a retired CSU Extension Agent, where she served for 15 years. This is her 23rd year teaching with Denver Botanic Gardens where she continues to inspire gardeners—seasoned and new—across the Front Range.