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How Is a Giant Freeway Landscaped?

Long before she became a landscape architect, decades before she landscaped schools, ports, airports and parks, Lynn Capouya gathered discarded Christmas trees.

"I was five or six," she explains, "And I thought they were so beautiful. I went through my neighborhood and drug them back to my house. It was all about the 'color.' My work is still all about the color."


    Lynn Capouya cannot resist picking up trash in an area she will soon be landscaping. Sunset Dr Bridge spans the I-405 behind her.

For Capouya and her team, however, finding that color does not necessarily mean creating lush gardens and sweeping lawns and towering foliage.

Just as important might be devising a planting scheme that avoids distracting drivers or avoids the threat of fire blight or requires little maintenance. These were major concerns for Capouya and her team as they developed the landscaping design for the widened I-405 Freeway through the Sepulveda Pass.

Complicating her task, some of the areas that contained trees will now be too narrow for them. Some sidewalks that featured trees will now have extensive utilities under them, restricting the room for tree roots. Some large trees will be replaced with smaller trees, because of their greater chance of survival.

"We design the open spaces between and around facilities," says Capouya in summarizing her work. And the results of that work are not apparent immediately. "We want the environment to look better over time."

Landscape architects such as Capouya must recommend a palette of plants and trees that addresses community input, project limitations, and plant viability.

"In selecting plant material, you're selecting so that people who aren't familiar with plant materials cannot poke themselves in the eyes or eat something poisonous," she explains. "Caltrans has a list of invasive species [that we have to avoid]. The Los Angeles Fire Department has fire-fuel reduction requirements, especially near structures."

Working within these goals, some popular plants do not make the cut. For example, Capouya 's team will not recommend uncommon or hard-to-locate species. They ignore trees that drop a large quantity of seeds or leaves. "When we pick a plant, we have to pick one that is resilient in its environment," Capouya explains.

Take the popular oleander, for example. Capouya has not planted an oleander in 10 years because the plant has been ravaged by the bacterium Xylella fastidiosa, better known as leaf scorch or fire blight.

An overriding concern for Capouya during the design process was the lack of water in the Sepulveda Pass and local agencies' request that whatever was planted require no irrigation.

In terms of budget, the I-405 project is the largest project she has undertaken. Fortunately, Capouya has been developing landscaping plans for public areas almost since the Montgomery, Alabama native became a landscape architect in 1981.

"My first project in 1982 was a Veterans Administration hospital in Birmingham, Alabama," Capouya recalls. "My second project was a military hospital in Dayton, Ohio, so I pretty much grew up on public facilities." The University of Arizona graduate has worked in California since 1982.

Despite their restrictions, Capouya enjoys transportation projects because they display her team's results to a large cross-section of society.

"I don't know if transportation projects are any more difficult," Capouya explains. "There is another set of rules. Risk assessment is always part of our work, so that the public is safe and the agencies are not at risk." 

"There is a whole familiarization with another set of standards, such as maintainability and sustainability," notes Tim Mann, a registered landscape architect and a senior associate with Capouya's firm. "We have to consider what will happen to what we install over time." This is a particular concern because public projects tend to remain longer than private projects.

Capouya, who has been working on highway projects since 1987, knows a great majority of people who will see the landscaping will be drivers passing by at considerable speed. "We want to enhance the experience," she insists. "We don't want to be a distraction."

"How is the landscaping going to represent the area that drivers are passing through?" Mann asks himself as he works. That balancing act between memorable landscaping and driver safety is what interests him.

For Capouya, the bottom line for her work on the I-405 is simple: "I would like for it to be a pleasant experience when you drive down the freeway, whether you are driving 10 or 60 miles an hour."

Ned Racine


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