Category Archives: Trees

By Mallory Pratt | Concordia Tree Team

After every storm or weather event, the infosphere we live in is filled with tales of disaster. Stories end in triumph, tragedy or near misses. Their collective effect on us is often one of fear or anxiety over what ifs. Tales of fallen trees after ice storms are no different. During the recent ice storm, our neighbors watched in awe as their 100-foot tall pine tree swayed from its base. We heard the creak of a Doug fir’s roots heaving in the lot behind us.

Why Do Trees Fall?

Trees fall because of heart rot or root rot. Heart rot is a disease caused by fungi that enter the tree through wounds in the bark and decay the wood at the center of the trunk and its branches. The diseased center softens, making trees structurally weaker and prone to breakage and falling.

Root rot is a condition in which the soil around a tree does not contain enough oxygen, due to excessive standing water around the roots.

Because the climate in Portland is so wet, both heart rot and root rot are hard to prevent. But there are visible warning signs that they are occurring. One indi- cation that heart rot has begun is the presence of mushrooms around the base of the tree. Yellowing and dying leaves can indicate root rot.

How Can We Prevent Trees from Falling?

It is tempting to cut down trees to prevent them from falling, but there are ways to protect our trees from damage and disease without eliminating them. One way is to provide good structural pruning based on species guidelines. It’s also important to follow a tree’s summer watering needs. For example, oaks don’t mind long, dry spells but dogwoods prefer steady water during drought. In addition, mulching and keeping heavy objects like cars and building materials away from the root zone prevents soil compaction and rot.

It is a good idea to conduct an annual inspection of trees around your home. Look for trunk damage, roots that circle above the ground, mushrooms and yellowing leaves. Larger, older trees can be evaluated by Urban Forestry staff.

Urban trees are a necessity because they protect us from heat, filter the water and air, and shelter wildlife. We need to work to protect both public and private spaces that house trees and we should continue to plant trees now so they are resources in the future. Most of all, we need to remember that healthy trees are our allies for a healthy future, and they need our help now and again to thrive.

The Concordia Tree Team volunteers prune street trees, maintain an arboretum at the former Meek school and help neighbors find resources for tree management. We invite you to join the Tree Team, water your trees (even the big ones) during summer heat waves, talk to your neighbors about trees and support tree-friendly policies. For more tree care tips and to get involved, check out our blog posts at ainsworthlineararboretum.org.

Mallory is a science educator that has lived in Concordia since 1995. She joined the Concordia Tree Team in 2019 and is an active volunteer with Friends of Trees.

By Jim Gersbach | Concordia Tree Team

I am often asked by property owners and passersby between Martin Luther King Jr. Boulevard and Fernhill Park when a tree that has died or blown down in a storm will be replaced.

Although a different Portland city bureau actually owns the land in the Ainsworth median, Portland’s Urban Forestry section with the Parks and Recreation Bureau has been kind enough to handle removals and pay for replacement trees.

In the past couple of years, two old Norway maples that were in slow decline finally blew over—one in the middle of the block between Northeast 16th and 17th avenues, and another further east around Northeast 26th. A third tree on the east end of the intersection at Northeast 33rd was struck by a car, revealing serious inner rot. That tree was cut down as a precaution against falling into traffic.

In order to replant, the city must first grind out the stump. With many trees downed in the late April snowstorm of 2022, Portland cleanup crews had their hands full grinding stumps all over town.

At the start of this year, they were finally able to grind the stump between Northeast 16th and 17th. That allowed for the planting of a replacement tree this winter. Urban Forestry plans to stump grind the remaining two downed trees by this end of this year, permitting planting of their replacements in 2024.

Because maples—especially the invasive Norway maple that has dominated the median since the post-World War II years—are seriously overplanted in Portland, Portland Urban Forestry picked a species that was added to the approved street tree list only in the past decade and has not been readily available in a size large enough to plant. That tree is a California interior live oak, Quercus wislizeni. This evergreen oak has small, leathery leaves that are dark green above and toothed somewhat like a holly. New leaves emerge a bronze to reddish color.

Hardy enough to survive a typical Portland winter, California interior live oak grows between the borders of Oregon and Mexico, in both the Coast Range and Sierra Nevada, where it can be found at elevations up to 6,500 feet.

Interior live oak is quite tolerant of drought and heat, as one would expect of a tree from inland California. It should fare well in future extreme hot-weather events. Interior live oak can grow as tall as 60 to 75 feet in good soils with adequate moisture. Its acorns take two years to mature, providing food for squirrels and birds when they do.

The odd-sounding botanical name honors German-born army surgeon, explorer, botanist, and plant collector Frederick Adolf Wislizeni [1810–1889]. Wislizeni opposed monarchical government and eventually had to flee to Switzerland before emigrating in his early 20s in 1834 to the United States. He traveled widely in the American Southwest and Northern Mexico, where he was imprisoned for a time during the Mexican-American War.

Jim Gersbach has been a volunteer tree planter and tree pruner for more than 30 years with Friends of Trees. He has worked for Portland Urban Forestry and as a member of the Concordia Tree Team, has helped inventory the neighborhood’s street trees and advises homeowners on site-appropriate tree options.

By Jim Gersbach and Ric Vetter | Concordia Tree Team

Did you enjoy the shade and coolness of neighborhood trees this summer? Many of those street and school trees in Concordia have been cared for by a dedicated group of neighbors who make up the Concordia Tree Team.

Our activities include pruning small street trees in the spring and fall, watering through the summer and occasionally working with other organizations such as Trees for Life Oregon, distributing watering buckets in various neighborhoods, and Portland Parks and Recreation, which works on tree planting.

Each autumn, we select a different area of Concordia to prune small street trees with the permission of the homeowner. Residents can consent to our services by following guidance on hangtags we leave on doors or by signing consent forms when our volunteers canvas the streets that will be covered this year.

If we prune your trees, please feel welcome to watch us work, ask questions and provide comments. The Concordia Tree Team has been involved in creating each of the neighborhood’s three arboretums, or tree museums.

The Ainsworth Linear Arboretum was established in 2005 at the request of Concordia neighborhood Tree Steward Jim Gersbach with support from volunteers from the Vernon and Woodlawn neighborhoods. The arboretum consists of the median and planting strip rows on 31 blocks of Ainsworth Street, from Martin Luther King, Jr. Blvd. to 37th Avenue.

You can learn more about the arboretum at AinsworthLinearArboretum.org.

Sixty years ago, the median was strongly dominated by Norway Maples, a tree that is now considered a nuisance species and can no longer be planted on city property. For the past 17 years, Gersbach has worked with Portland Parks and Recreation to select trees that are relatively rare in Portland to diversify the genetic mix along Ainsworth, as well as species that may thrive here as the climate changes. As old trees die, the maple monoculture is gradually giving way to a much more diverse treescape representing dozens of species and different genera.

The arboretum at Alliance High School at Meek Campus, 4039 NE Alberta Ct., was established in 2010 to form a learning landscape where students could learn about trees and biodiversity. Trees were selected from the currently successful and diverse oak genus and other genera that contain few members—or only one.

The Cully-Concordia International Grove, our third arboretum, is a collaborative project with the Cully neighborhood. Planted in March 2011, it is our youngest arboretum. The Bureau of Environmental Services funded the original planting after securing permission from the Oregon Department of Transportation, which owns the land. The goal was to slow stormwater runoff into the Columbia Slough, and to trial diverse species, including those that might be more climate resilient.

Trees were selected to represent every continent where they grow. Among them are Oregon myrtle; Mediterranean cork and holly oaks; a Mexican pine; an evergreen silverleaf oak from the U.S. Southwest; North African Atlas cedar; Chinese Pistache; Australian snow gums; giant sequoia and two Portland natives, Oregon white oak and Willamette Valley ponderosa pine.

Unfortunately, the neighborhood has learned that the Portland Bureau of Transportation intends to remove 14 of the 60-plus trees of the International Grove during construction to replace the bridge over Lombard at 42nd Avenue.

The young trees in all these tree museums require summer watering by our tree-team volunteers, who can be seen working on various nights and weekends at Meek and along Ainsworth.

The Concordia Tree Team was instrumental in securing Concordia’s first heritage tree, an American persimmon, as well as getting heritage status for one of the natural-form European hornbeams in Fernhill Park. We also provide water for park trees that appear to be struggling during our increasingly hot and dry summers.

The Tree Team was honored with a citation from Portland Parks and Recreation for meritorious work in organizing and executing the Fernhill Park tree inventory in 2018. This spring, with the help of many helpful Concordians, we pruned many small trees along Alberta Street in concert with other Earth Day volunteer activities.

Concordia was the first neighborhood in Portland to have its street trees inventoried in 2010. Tree Team members participated in that census. This summer, Concordia was again first in the city to have its street trees re-inventoried with help from the Tree Team. We look forward to sharing the results once they are tabulated by the City’s Urban Forestry staff.

If you’d like to be part of a fun, active group of Concordians and aren’t afraid of rolling up your sleeves to better the neighborhood, consider joining the Concordia Tree Team. We can be reached through the “Talk To Us” page on the Ainsworth Linear Arboretum Website, AinsworthLinearArboretum.org/talkto-us.

By Jim Gersbach | Linear Arboretum Founder, Concordia Tree Team Member

You’re invited to join me on a free walk to explore the Concordia Linear Arboretum Saturday, April 16. The 90-minute walk, sponsored by Portland Parks & Recreation Urban Forestry, will start at 9 a.m. at the southeast corner of 30th Avenue and Ainsworth Street.

Concordia is fortunate to have one of a handful of Portland’s tree-lined medians. It’s a stretch of about 1.5 miles from Fernhill Park to Martin Luther King Jr. Boulevard.

Since 2005, the median – and the right-of-way planting strips on the north and south sides of the street – have been designated by the city as an investigational arboretum.

Here, city residents can get to know less familiar, approved street trees, including ones in a trial for suitability in this climate.

Originally conceived as a grand entrance to the city from the east, Ainsworth was envisioned as a boulevard with a tree-lined median running from the Columbia Gorge to the Willamette River.

The only part ever developed as such is what exists today. The original Ainsworth planting was a classic monoculture – a single species of tree (Acer platanoides) that conformed to the uniform look so prized by European city planners. That made Ainsworth more vulnerable to any pest or disease that especially afflicted maples.

Portland’s mild climate can support hundreds of different tree species. As the city began to allow and then encourage more choices of species, many people still selected only what was familiar. Exposing people to great new options is what the Ainsworth Linear Arboretum is all about.

When trees die, we replace them with diverse species and new cultivars with better forms or disease resistance. Over 16 years, diversity in the median has grown from six to 47 species, and now there are trees native to Oregon.

Many people and organizations have helped. Trees and mulch have been provided by nurseries, Friends of Trees and Portland Parks & Recreation Urban Forestry. The parks folks have also removed dead trees, ground the stumps to enable new plantings and watered young ones for the trees’ first two summers. Members of the city Youth Conservation Crew have weeded and mulched.

Because Portland has experienced multiple drought years, I have handwatered a lot of the trees beyond two years to help them establish.

Editor’s note: CNews space is limited, and there just wasn’t room for all of the information Jim Gersbach provided. To see his full-length story, visit ConcordiaPDX.org/2022-linear-arboretum-tour.

Concordian Jim Gersbach is public affairs specialist for the Oregon Department of Forestry and former urban forestry specialist for the city of Portland. His volunteer activities include serving on the Concordia Tree Team, founding the Ainsworth Linear Arboretum, acting as an outreach guide for the Hoyt Arboretum, and providing education as well as leading planting and pruning crews for Friends of Trees.

Haley Miller has her dream job at Friends of Trees. In fact it was trees – and the outdoor recreational opportunities – that brought her to Portland in 2010.

“Trees have just such a calming effect to me,” she explained. “If I feel really stressed or overwhelmed, I go to anywhere they have big trees.

“That’s why I think it’s important to get more trees in the city, so people who can’t make it to a national park can take a walk in their neighborhood park and see trees, and be around trees.”

Just as important are trees in parking strips, Haley added. “They provide shade and protection from wind and rain.” They also provide barriers for pedestrians from cars and tend to slow the traffic.”

Beyond emotional and esthetic qualities, environmental science credits trees for improving air quality and reducing “heat island” effects on hot days. “I love putting more trees in places that need them the most.”

She goes further than helping neighbors select trees to put in the ground. Friends of Trees has spawned community engagement around tree plantings. Although the organization serves the entire metro area, neighborhood trees senior specialist Haley is responsible for planning the planting events in Concordia, Vernon, Woodlawn and Piedmont neighborhoods.

After Friends of Trees accepts requests from local residents for trees in their yards, she plans morning-long planting efforts in the four neighborhoods.

Pre-pandemic, that meant creating a central staging area where about 200 volunteers met for breakfast and training. They divided into teams, each with an experienced team leader and about 10 trees to plant. They’d return by noon for a celebratory potluck lunch.

“People would meet each other, neighbors meeting neighbors,” she said. “The whole community aspect is really important to us.”

In a typical season – October through April – 6,000 volunteers donate about 40,000 hours.

During the pandemic, 21,311 trees and native shrubs trees were planted, but volunteers worked mostly solo. Those experienced volunteers were provided trees and locations to plant them.

“I was grateful and in awe,” Haley recalled. “They still came out in the rain on their own and planted the trees. It just shows how important trees are and how these volunteers respect that.”

Haley and her 27 colleagues at Friends of Trees are now planning how COVID-19 concerns will shape the upcoming planting season. For details as they become available, contact her at Haleym@FriendsOfTrees.org.

There’s one thing she can predict now with certainty. “We’ll engage the community in a way that feels safe and respectful.”

Nancy Varekamp is semiretired from her career in journalism, public relations and – her favorite work engagement – writing and editing targeted newsletters.

Often, when homes in Concordia are demolished – to be replaced with new, larger homes – any existing mature trees on the site are also removed.

This practice can remove habitat for birds and animals, as well as remove the shading, cooling and air quality services trees provide to help mitigate the urban heat island effect.

But doesn’t Portland have an adopted city tree code that implements the Portland Urban Forest Plan and protects the beloved trees of our neighborhood?

According to research provided by neighbor Jordana Leeb, yes. And no.

Unfortunately, the current tree code exempts sites of under 5,000 square feet in size from tree preservation requirements when undergoing development.

What this means effectively is almost none of Concordia west of 33rd Avenue is subject to the Portland Tree Code:

• Parcels south of Killingsworth Street tend to have an average lot size of 4,000-5,000.
• Parcels north of Killingsworth sit on historically platted lots that are only 2,500 square feet.
• Even east of 33rd many parcels are – or can be – subdivided into lots of 5,000 square feet or less.

For sites over 5,000 square feet, onethird of all on-site trees over 12 inches in diameter are to be preserved, but applicants can choose to pay fees in lieu of preservation for any trees they wish to remove below this threshold.

The fee is only due, however, if the site isn’t eligible for an exemption from the tree code because a tree is:

• Dead, dying or could be declared dangerous by an arborist
• “Nuisance species”
• Exempted by a land use review
• Tree removals already approved through a land division or planned development
• Other reasons

Indeed, Portland’s tree code seems to be doing its part to help perpetuate Portland’s nickname: Stumptown.

Data from 2018 to 2020 citywide reports over 33 trees were chopped down that were at least a foot in diameter of the trunk at the breast height of the average person. Additional were uncounted trees with smaller diameter trunks.

The Portland Urban Forest Management Plan lacks any sort of quantitative goals to achieve in terms of tree canopy coverage, urban heat island mitigation or even tree planting.

Plans without goals are easier to achieve, which perhaps explains why this plan, policy and code do very little to actually preserve the trees of Concordia from being cut down during development.

According to the Portland Urban Forest Action Plan of 2020, 30.7% of the city is covered currently by tree canopy, up from 26% in 2002.

The plan does not state a goal for future tree canopy coverage; however, other cities have adopted goals. Nearby Milwaukie has a goal of increasing its tree canopy to 40% by 2040. Farther away, a tree canopy already covers 40% of Pittsburgh, which is still seeking to protect and expand tree coverage beyond that.

Garlynn Woodsong lives on 29th Avenue, serves on the CNA board and is an avid bicyclist. He also is a dad who is passionate about the city his son will inherit. He is the planning + development partner with Cascadia Partners LLC, a local urban planning firm. Contact him at LandUse@ConcordiaPDX.org.

Reminding a community of its differences and similarities, creating a living laboratory to study trees, filtering pollutants and noise from nearby arterial roads, acting as a gateway for people traveling from the airport to northeast Portland neighborhoods.

All these and more were the aspirations for creating the International Grove 10 years ago at the corner of 42nd Avenue and Lombard Street.

Developing the grove was part of the Bureau of Environmental Services Grey to Green Canopy Initiative. That eightyear commitment began in 2008 to increase the health of local watersheds.

Efforts included construction and planting projects to divert stormwater from the sewer system, reduce flooding and erosion, filter pollutants, provide habitat and increase neighborhood green space.

The Concordia and Cully tree teams and the Ainsworth Street Collective were involved in planning and planting the grove. Maintenance over the years has mainly been performed by volunteers.

To reflect the many cultures represented in nearby neighborhoods, the grove includes trees from six continents. Those trees include the Chilean beech and the Moroccan snow gum. This diversity is in contrast to the maples, ornamental cherries/plums and crabapples found widespread in the city.

A similar combination of trees was not anywhere else in the city, apart from perhaps Hoyt Arboretum, according to Robert Pallesen. In 2011 he served on the Concordia Neighborhood Association Tree Team.

“We will now have a unique arborscape that will look distinctive and attractive year round,” he told The Oregonian in 2011.

Planting different types of trees in the grove also offers an opportunity to study, over time, which trees could offer shade, mitigate climate change effects and filter air pollution.

For example, current day tree team members found the cork oak tree did much better in a recent ice-storm than expected.

“The grove is important because as northeast 42nd becomes denser and more built up, urban heat island effects will become more pronounced,” said Jim Gersbach, Concordia Tree Team member.

“Expanses of tree-shaded land will become even more precious and lifesaving as cool-air refuges,” he added.

Jordana Leeb is a longtime Concordia resident who is passionate about the neighborhood, its people and trees. She lives with her partner and newly adopted special needs dog. You can see her recent film about Concordia at TinyURL.com/ DiaryOfAStreet.