Benefits of a Healthy Urban Forest and Yard

October 2023


5th Annual Lake Oswego Tree Summit
Our Urban Forest: Rooted in Care and Commitment

As residents of our urban forest, you are invited to attend and participate in the fifth annual community Tree Summit. This year’s Summit will be held in person.

Saturday, November 4th from 9 am to Noon
Mountain Park Clubhouse – Hawthorn Room
2 Mt. Jefferson Terrace,  Lake Oswego

The LO Tree Summit is held annually as a forum for people to gather together to increase their arboreal knowledge, discuss the importance of a healthy, interconnected urban ecological system, and share opportunities to maintain the health of the urban forest.


Keynote Speaker: Scott Altenhoff, Urban and Community Forester, Oregon Department of Forestry.  Scott will speak on the unique character of the Lake Oswego urban forest and its complex habitats, as well as the intrinsic relationship people have with the health of an urban ecosystem. Scott’s presentation will be followed by a panel of residents who will share their experiences cultivating and participating in the Lake Oswego urban forest. The City of Lake Oswego will also provide an update on the Urban and Community Forestry Plan.

Join us to deepen your understanding of your natural surroundings and how you can help reduce human impacts.

LO Tree Summit is presented by the Oswego Lake Watershed Council
in partnership with the Lake Oswego Sustainability Network.


Mary’s Garden

We recently lost Mary Ratcliff, one of the founding LOSN board members. Upon hearing of her death, John Movius with Terraccord Landscapes shared with us:

Mary was a longtime landscaping client who became a friend. She realized her vision of transforming her yard into a sanctuary for native plants and wildlife. She was a steward of the 150 year old Heritage Elm tree on her land, and the miner bee colony living deep beneath the soil outside her house. Her enthusiasm and curious spirit made working with her a joy. Mary was generous with her knowledge of bird life around her and would often pause while talking because she heard a call from near or far, which would allow us both to listen more closely in the moment. I had the opportunity to see over the years of working on her garden, how much joy she found in the natural world, and how much she liked to share laughter and wonder. I will always appreciate the trust she put in me to help her restore her landscape, which was part of a property that had a long history for herself and her family. We will deeply miss you, Mary.”

Mary’s garden is the epitome of what it means to Leave the Leaves. She had a deep appreciation of our interconnectedness within a natural environment. When the leaves fell in the fall, they remained in her garden and were allowed to compost in place. She knew those leaves provide habitat for frogs, salamanders, worms, a wide variety of insects and other invertebrates. That they provide nourishment for fungi and microorganisms that live in the soil. Mary trusted nature!  She understood the importance of allowing natural systems to work together. Her greatest joy was the birds that flocked to her garden to feed on insects, berries and seeds, build nests under bushes and in the trees, and drink a bath in clean water provided by her fountain. Her garden was free of insecticides and herbicides and she never used artificial fertilizers that would interfere with the way nature was thriving under her protection.

Please join us in honoring Mary: trust nature, leave the leaves and avoid using artificial fertilizers or pesticides.


Leave the Leaves…
and other sustainable gardening ideas for fall

Leave the Leaves:

  • If they fall in garden beds let them stay in place

  • If they fall on your lawn use an electric lawn mower to chop them up and let them stay in place

  • If they land on your driveway, patio or walks leave them for a while and let the wind blow them off.  Leaves that are not removed by the wind can be raked, swept or blown with an electric blower into your flower beds or onto your lawn before you chop them up with the mower.

By spring, all of the leaves will disintegrate into a leaf duff, which is just another name for natural compost. Some will even be pulled underground by earthworms.

Leave the flowers:

  • Birds will come to eat the seeds.

  • Wait until early spring to cut back your perennials to maximize winter food for birds and small mammals.

Leave the berries and other fruit on shrubs and trees.

Leave small branches and twigs – they provide good food for fungi. They will also disintegrate into the leaf duff.

Save yourself a lot of work and Leave the Leaves!

Get more ideas from the Oswego Lake Watershed Council and Electrify Now on Healthy Yard Care.


Electrify Your Landscaping

One of LOSN’s projects is working with others in our community and region to switch from gas powered landscaping equipment to electric landscaping equipment. Gas powered landscaping equipment causes significant air and noise pollution that negatively affects the workers, neighborhoods, habitat and health of the soil. Electric landscaping equipment is readily available and works great!

Communities all over the United States are targeting gas powered landscaping equipment in response to the significant noise and air pollution they produce.

The benefits of switching to electric landscaping equipment helps to significantly reduce carbon emissions and has major benefits for the well-being of our community.

Get more information from Electrify Now on the advantages of all electric landscaping equipment and healthy yard care.

For more information and resources check out the LOSN page on Electric LandscapingAmerican Green Zone Alliance is also a great resource. They are a leader in low-impact low-noise landscape solutions and does excellent work helping landscapers and communities transition to electric landscaping equipment.

A local volunteer organization, Quiet Clean PDX, is working to educate and offer solutions to eliminate gas powered leaf blowers.


Lake Oswego Home & Vehicle Electrification Fair

Thank you to everyone who attended the Lake Oswego Home & Vehicle Electrification Fair on September 23. For the first time, we were fortunate to record our speaker presentations and post to LOSN’s YouTube channel so you can watch anytime:

You Can Do It: How Electric Vehicles Work for All of Us

Financial Incentives for Home Electrification

Holistic Home Electrification

Selecting the Right Heat Pump for Your Home

How to Go Solar + Storage

Putting the Community in Community Solar


Webinar: What’s New in the Rapidly Changing EV World

If you missed our webinar on September 21, What’s New in the Rapidly Changing EV World, you can view it from our YouTube channel.

Addressing Climate Change through Natural Climate Solutions

LOSN Sustainability Insider

March 2021

LOSN Board Note: This newsletter features sustainability and climate action work led by our partner, the Oswego Lake Watershed Council (OLWC) with our Natural Resources Action Team.

Note: the format of our newsletter has changed. Scroll to the bottom for events and other updates.

Addressing Climate Change through Natural Climate Solutions

Oftentimes when we think about climate change we think of reducing our dependence on fossil fuels. Yet human contribution to the rise in carbon emissions in the atmosphere is not only due to our burning of fossil fuels, but also in the impoverishment of nature’s ability to absorb carbon in soil, in trees, and other high-carbon ecosystems. The degradation of our lands, including the earth’s fertile agricultural soils, is in itself another massive disaster facing humans. Yet, by looking to nature, we can take actions that can change this trajectory. Natural climate solutions – conservation, restoration, and land management activities – can help revive nature’s ability to sequester and store carbon.  Find out how healthy soils are an intrinsic component of addressing climate change and cooling the earth.

LOSN partners with the Oswego Lake Watershed Council (OLWC) in the goal of protecting our natural resources through the use and promotion of these natural climate solutions. OLWC leads restoration of watershed function on private land while the City works to enhance natural resources and their ecological services on City-owned land.

OLWC also works within the community through the Urban Forest Committees to protect and enhance our urban forest and holds the annual Tree Summit for the community. Additionally, the council is leading the LO Trees Initiative to inventory the urban forest by deploying citizen scientists to help achieve the Lake Oswego Climate Goal of planting or protecting 5000 trees in 5 years.


The Dirt on Trees

We love our trees!  We love their shade, their graceful patterns against the sky and how they store carbon to combat climate change. But where would trees be without their roots? The roots we cannot see but know anchor the beauty towering over us. Where does that stability come from? The soil into which the trees reach. What do we know about that soil? Do we just take it for granted?  It’s always there!

That soil is as important to the health of our trees as the air is to the trees making food. The air supplies the carbon for tree leaves to make the food and structural building blocks to keep the tree alive and growing. An important part of that process (known as photosynthesis) also requires water that is extracted from the soil by the tree roots. But that soil does so much more than anchor the tree and provide water – it also supplies all of the minerals and other nutrients (particularly nitrogen) trees need to live.


Dirt via University of Oklahoma, Citizen Science Soil Collection Program

For many years soil scientists thought of soil as an inanimate object composed of ground up rocks. But that is only half of the story. The other half of soil is air, water, and organic matter which includes a multitude of living organisms. The living, biological component includes microbes, mycorrhizal fungi, insects  and worms. Most of which are too small to see with the naked eye. This living component of soil is the key to healthy, fertile soil. This unseen living system breaks down the soil to supply minerals, capture nitrogen from the air, and create spaces for water and air. Without this living component soil just doesn’t work properly. Tree roots are also an important part of this system since plants actually take some of the food they make in the form of sugars and pump it into soil to feed these organisms. This is an interactive system where the biotic components provide nutrients and plant roots provide food for these organisms.

When we use pesticides and artificial fertilizers we kill off these living organisms and destroy this interactive system. Artificial fertilizers actually make the tree roots lazy and they stop expanding and feeding the soil. You probably noticed some large trees planted in the middle of the lawn at an apartment complex along Boones Ferry Road that had fallen over in the ice storm. Their roots just couldn’t support them with the extra ice. There is a good chance that lawn receives artificial fertilizers and the roots just stopped growing.

We all benefit from understanding natural systems and supporting natural processes. Get to know your dirt! Join us for the Soil Your Undies activities in April!


Soil Your Undies Campaign – Spring 2021

Check out the upcoming activities to learn more about soil.

April 8 – LOSN Monthly Forum: The Soil Will Save Us
Time: 6:30 pm to 8:00 pm
Speaker: Kristin Ohlson – Registration link below

April 22 – Get To Know Your Dirt – online workshop
Time: 5:00 to 6:30 pm
Presenter: Oswego Lake Watershed Council
Venue:  Online Zoom
Summary: Explore what makes up healthy soil and how your gardening practices can support building your soil heath and help sequester CO2.

April 24 – Soil Your Undies Kickoff
Pick up a free pair of 100% tighty whities at either Lake Oswego or Lakeridge High School between 10:00 am and 2:00 pm. Limited to 200 participants. Pre-registration required. More information at www.oswegowatershed.org.

July 7 – Reveal Your Undies
We will get together on Wednesday July 7th to show our undies and discuss the results. We hope we will be able to meet in person! Details will be announced on the OLWC website.


April is Arbor Month in Lake Oswego

April is Arbor month, and we will be celebrating trees and our urban forest all month long! Join in the festivities throughout the month capped by a celebration on Arbor Day, April 30th.

Lake Oswego has a diverse urban forest and has been a member of Tree City USA for over 30 years! This means that individual trees throughout the city connect to create an urban forest system that provides countless benefits to the community. Do you love Lake Oswego’s trees and want to make a difference? OLWC is encouraging the community to celebrate Arbor Month 2021 by working together to preserve our urban forest.

OLWC is sponsoring a community event throughout the month where you can be an urban forest hero by protecting your neighborhood trees from ivy. Check out how this works here.

The city’s next Hello LO will have more information about all the Arbor month activities. Or check the OLWC Arbor Month webpage at the beginning of April for additional Arbor Month activities.


LOSN Interfaith Coffee: Join Us in a Conversation with Councilor Massene Mboup

Date: Tuesday, March 16th, 2021
Time: 10-11:30 am
Where: on Zoom

Description: Not only is Massene our newest Lake Oswego City Councilor, he has an incredible journey and perspective to share. Hear Massene talk about his life in Senegal, his journey to Lake Oswego, and his appreciation for the Earth. We are so grateful for Massene agreeing to join us and we hope you will join as well!  

Councilor Mboup, who has lived in Oregon for over twenty years and in Lake Oswego since 2011, is the founder and Executive Director of the International Leadership Academy (ILA), a private, nonprofit French immersion school located in the heart of Lake Grove on Boones Ferry Road in the Hope Community Church.


April Online Forum: The Soil Will Save Us

Speaker:  Kristin Ohlson, Author, The Soil Will Save Us
When: Thursday, April 8, 2021
Time:  6:30 pm – 8:00 pm
Where:  on Zoom

Did you know that good old dirt could help solve the carbon crisis?  Thousands of years of poor farming and ranching practices – and, especially, modern industrial agriculture – have led to the loss of up to 80 percent of carbon from the world’s soils.

Kristin Ohlson, author of The Soil Will Save Us, will present her passionate case for “our great green hope” – a way in which we can heal the land, turn atmospheric carbon into beneficial soil carbon, and potentially reverse global warming – through regenerative agricultural and landscaping practices.

In her talk, Ohlson introduces some of the visionaries from her beautifully researched book. She shares stories from scientists, farmers, ranchers, and landscapers—who are figuring out in the lab and on the ground how to build healthy soil including the herd of microorganisms that escape our notice. Better land management practices, that lead to healthy soils, can help solve a myriad of problem: including drought, erosion, air and water pollution, and food quality, as well as climate change. Join in on April 8 to discover a whole new world beneath our feet.

To learn more about our speaker please visit her website: http://www.kristinohlson.com.


May Online Forum: Transitioning to Electric Landscaping Equipment

Speaker:  Dan Mabe, CEO, President of American Green Zone Alliance
When: Thursday, May 13, 2021
Time:  6:30 pm – 8:00 pm
Where:  Webinar on Zoom

Learn about how communities are moving toward pollution free, all electric landscaping equipment and services.

Come hear from Dan Mabe, CEO, President of American Green Zone Alliance, talk about how we can transition from gas powered landscaping equipment to all electric powered equipment which helps to reduce air and noise pollution.

To learn more about our speaker and American Green Zone Alliance please visit agza.net.