Hoyt Arboretum Friends (HAF) is a membership-based, nonprofit organization working in partnership with Portland Parks and Recreation to support Hoyt Arboretum.

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Upcoming Events & Classes

Broadleaf Evergreen Identification

Saturday, December 2
9am-12 pm
$15/member, $20/non-member

It's very common for people to use the term ‘evergreen’ to refer to only conifers, but this distinction isn't exactly accurate. Many genera of broadleaves, too, have a species that have opted to retain their leaves year-round. Oaks, madrones, magnolias, hollies, and others all have examples of evergreen species. In this course, we're going to focus on identification of some of these broadleaf evergreen species, and discuss how this evolutionary strategy works and why these trees are becoming more and more important in the face of climate change and urbanization.

About the instructor: Casey Clapp is an avid plant enthusiast and Certified Arborist who specializes in tree identification, risk and health assessment, and diagnostics. Currently, Casey works for the City of Portland as a Tree Inspector and previously has worked as a consulting arborist across the region. He holds a Bachelor of Science in Forest Management and a Master of Science in Environmental Conservation.

Limited to 15 people. $15/member, $20/non-member. Registration is required. Sign up below via Paypal or call call (503) 823-1649.

Member / Non-Member



History of Hoyt with Marcy Houle

Saturday, December 2
Free presentation!

Join us for an afternoon presentation by local author, Marcy Houle, to learn about the history of Portland's museum of living trees, Hoyt Arboretum. Marcy will be available for book signing after the presentation.

About the speaker: Marcy Cottrell Houle is a professional wildlife biologist, national speaker, and award-winning author of four books, including One City's Wilderness. Marcy lives with her family on a farm on Sauvie's Island, near Portland. 

Winter Plant Identification

Saturday, December 9
$20/member, $25/non-member

Learn all about winter plant identification with instructor Ruth Williams. An indoor and outdoor workshop component will be included.

Part 1: Introduction to Winter Plant Identification, In-Classroom Instruction (9:30am-11:30am)

Have you ever gazed at the frost covered branches of a tree in winter and wondered, "What kind of tree is that?" It can be tricky to identify trees without their familiar leaves, flowers, and fruits. Join us to learn how to identify dormant trees based on twigs and other clues. The course will cover 10 common landscape trees such as ash, maple, and pear at the family level.

Part 2: Winter Plant Identification, Outdoor Interpretive Hike (12-2pm)

We will look at trees from a variety of families and how to tell one genus from another. Please dress warmly. 

About the instructor: Ruth Williams is an arborist and plant enthusiast with degrees in Horticulture and Landscape Architecture from UC Davis. She has conducted year-round inventories of over 100,000 urban trees over the past 7 years as a consulting arborist for the Davey Resource Group. She teaches botanical illustration and dormant plant ID at Hoyt. She lives in Southeast Portland with two heritage California bay Laurels, her husband, and seven chickens. 

Limited to 15 students. $20/member, $25/non-member. Registration is required. Sign up below via Paypal or call (503) 823-1649. 

Member / Non-Member

Christmas Trees at Hoyt Arboretum - Guided Tour

Saturday, December 16
$3 recommended donation, HAF members free!

Join Ken Denniston for a guided tour of popular Christmas trees in the conifer collection at Hoyt Arboretum, including Oregon natives and other Christmas trees available in the Portland area. The tour includes Christmas tree history and tips on picking out the perfect Christmas tree. 

Registration is not required; please meet at the Visitor Center. 


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