Our Lecture Series is presented 10 months a year on the 2nd Monday of the month from 7:00 to 8:00 pm at the Milwaukie Center – 5440 SE Kellogg Creek Dr. Milwaukie, OR 97222. Talks are free and open to the public.


Our informative talks will resume in September.
Enjoy your summer, and your garden!


2022 Past Lectures


February 14, 7 – 8pm: Noteworthy Trees of Portland’s Hoyt Arboretum Martin Nicholson

Founded in 1928 to conserve endangered species and educate the community, Hoyt Arboretum encompasses 190 acres and 12 miles of hiking trails. Home to 2,300 species of trees and shrubs from six continents, Hoyt Arboretum is a place of beauty and serenity no matter the season.

Martin is a tree expert who has worked for Oregon State University and Washington State University research facilities, as Plant health manager with J Frank Schmidt Nursery, and for the past 15 years, at the Hoyt Arboretum. He is an ISA Certified Arborist, and serves on the Great Plant Picks tree committee and the Portland Heritage tree committee.

Join us on Monday, February 14, for an arm-chair adventure through the Hoyt Arboretum. Together we will learn about noteworthy trees with Martin Nicholson, curator of the arboretum, as our guide.


March 14, 7 – 8pm:  Heat of the Moment: How Climate Change Impacts Insects in Our Garden –  Dr. Gail Langellotto, OSU click for recorded video

Gardeners have seen the effects of climate change — warmer winters, wilder swings in weather change, prolonged drought, and intense wildfires. To garden well in these times requires a new understanding of how the changing climate affects other players sharing our garden ecosystem.

A major presence in our gardens are insects. Being ectotherms, their body temperatures and biochemical processes are directly affected by air temperature. As a result, any change in the climate has an immediate and significant impact on them. Geographic range expansion, phenological changes, heat stress, and disruption to natural relationships between insects and plants are some examples.

This lecture addresses how climate change affects insects and what gardeners can do to prepare for and mitigate climate change and its effects.

Dr. Gail Langellotto is an insect expert and Professor of Horticulture at Oregon State University. Together with her lab group, the OSU Garden Ecology Lab, she studies the plants, insects, people, decisions, and management practices that either improve or degrade a garden’s ability to promote environmental and human health. She also serves as the Extension Urban and Community Horticulture Specialist and the Statewide Extension Master Gardener Program Coordinator.

Handout: Heat of the Moment: How Climate Change Impacts Insects in Our Garden


April 11, 7 – 8pm: Organic Vegetable Gardening: Keys for Success –  Weston Miller, OSU

Learn tips for successful organic vegetable gardening from Weston Miller, OSU Community and Urban Horticulturist. Topics will include definition of the team ‘organic’, soil preparation techniques, organic fertilizer options, as well as organic pest and disease management.

Weston Miller has been the manager of the OSU Master Gardener Program in the Portland metro region (Clackamas, Multnomah, and Washington counties) since 2007. As the program manager for Solve Pest Problems, he works with OSU and stakeholders to plan and initiate this new, state-wide outreach program. He also serves as elected director and treasurer for West Multnomah Soil & Water Conservation District.


May 9, 7-8pm: The Fascinating World of BatsElaine Murphy, Naturalist and Educator

Explore the fascinating world of bats, the only mammal that can fly. Bats are hungry insect eaters, and they are welcome visitors to our gardens. The world’s 1400 species of bats also provide other benefits such as pollination and seed dispersal.

Elaine will describe bats that live in our area, where to find them, and how to attract them. The talk will be illustrated with slides and sample bat houses. Elaine Murphy is as naturalist and has been an educator for nearly 40 years.  She teaches nature classes and leads bird walks in the Portland metro region. Recently she has appeared at the Tualatin Hills Park and Recreation District, Backyard Bird Shop, numerous garden centers and many garden clubs. 



June 13, 7 – 8pm: High Impact Plant Combinations Laura Eyer, Clackamas County Master Gardener

This program will be presented by our very own Laura Eyer, a Clackamas County Master Gardener for 30 years. She has produced many of our 10-Minute Universitytm videos on ornamental plant design.

Laura will show us how to achieve High Impact Plant Combinations by employing three  important principles that are the cornerstone of high impact plantings.  She will tell us how to use the color wheel to achieve the right combinations and how to compose a planting that will enhance the tapestry of the garden. 

Click for the following handouts: High Impact Slide List    Color and the Color Wheel



See the links below for details and program notes from previous years. *Note if lectures were presented as a webinar the links will be included.

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