Clackamas County Master Gardeners

Monthly Lecture Series

We hold free lectures on the 2nd Monday of each month (except July and August) at the Milwaukie Center (5540 SE Kellogg Creek Drive in Milwaukie). Lectures are open to the public and start at 7 p.m. 

If you have a physical disability that requires special considerations in order for you to attend the event/activity, please notify the metro Master Gardener program at 503-655-8631 or 

Master Gardener Volunteers: Now it's easier to get your recertification hours. Tagged lectures can be applied toward your Master Gardener program training requirements. Lectures will be marked with *MG education credit*


December 11:

Garden Art and Symbols, Steve Pettengill

Landscape Consultant and Horticultural Therapist, Stephen Pettengill will teach us the basics of symbolic references commonly found in natural settings as well as art selection and placement in the garden.  Whether you are considering a fountain, statuary, or just the understated power of a well-placed boulder, come and learn how this designer uses symbolism and art in customized environments.  Learn to set the stage for inspiration, relaxation and socializing in your outdoor living space.

Stephen Pettingill earned an interdisciplinary degree (Business, Gerontology, and Environments) from Marylhurst and completed a Horticultural Therapy program in Portland.  He also has a lifelong study of horticulture and design.


Announcing our 2018 Lecture Series! Save the date for the following programs: (list is subject to change, more info will be posted as it becomes available)


January 8, 2018

Lessons from the Hoyt Arboretum - Fred Nilsen, Arboretum Director

February 12, 2018

Fire in the Columbia Gorge - Lisa Norris, US Mt. Hood Forest Service

March 12, 2018

Growing Carnivorous Plants - Jeff Dallas and Jacob Farin

April 9, 2018

Beyond Pinterest: Unlocking the Secrets behind the Pretty Picture - Darcy Daniels, Landscape Designer

May 14, 2018

Science of Hops and Brewing - Shaun Townsend, OSU Hop Breeding

June 11, 2018

Meadow and Grass Ecology - Tom Kaye, Institute for Applied Ecology

September 10, 2018

Five Remarkable Women, Five Remarkable PNW Gardens - Donald Olson, author, Pacific Northwest Garden Tour (Timberpress books)

October 8, 2018

Earthquakes in Northwest Oregon - Dr. Scott Burns, Geologist

November 12, 2018

From Poor Farm to Global Attraction: The History of Portland’s International Rose Test Garden - Harry Landers

December 10, 2018

Leach Botanical Garden Plants and History - David Porter, Director of the Leach Botanical Garden


Details and program notes from 2011, 2012, 2013, 2014, 2015, 2016, 2017


Clackamas County Master Gardeners are the folks who put on the annual Spring Garden Fair, bringing together over 7,000 gardeners with over 150 plant and garden-art vendors.

Oregon State University Extension Service offers educational programs, activities, and materials without discrimination based on age, color, disability, gender identity or expression, marital status, national origin, race, religion, sex, sexual orientation, or veteran's status. Oregon State University Extension Service is an Equal Opportunity Employer. In reference to publications, events, or activities: Publications will be made available in accessible formats upon request. Please call 503-655-8631 for information. If you have a physical disability that requires special considerations in order for you to attend the event/activity, please notify the metro Master Gardener program at 503-655-8631.