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Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Avenue, Room 1000, Portland, OR 97204

Air Gapping: Protecting Portland Trees from Invasive Vines

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Environmental Services and Portland Parks & Recreation, along with most Portlanders, are big proponents of the benefits of trees in urban areas. While much effort goes into finding new places and new ways to plant trees, keeping mature urban trees healthy is equally important.

In the city’s natural areas, the non-native, invasive vines English and Irish ivy (Hedera helix and H. hibernica) and Traveler’s Joy (Clematis vitalba) are serious threats to Portland’s tree canopy. They can grow from the ground up in to the crowns of mature trees and add tremendous weight to trunks and branches. That makes trees much more susceptible to breaking or falling, especially during freezing rain, snow, or strong wind. 

Cutting ivy and clematis vines from around the base of trees kills the vines up in the canopy and has become a Portland tradition. Thousands of Portlanders have joined the effort to liberate trees in parks, green spaces and yards.

This spring, Environmental Services mobilized vegetation management contractor crews to tackle some well-established ivy and clematis vines in hard to reach areas that are less accessible to school and volunteer groups. From late April through June, workers used chainsaws and machetes to remove old growth ivy from tree trunks on about 350 acres around Barbur Boulevard, Marquam Nature Park, Oregon Health Sciences University and Forest Park.

   

A few weeks after the vines are severed at the base of the tree, they die, wither, and eventually fall to the forest floor and decompose. In these before and after pictures, you can almost see the trees breathing a sigh of relief!

before 

 

after 

 

before 

 

after 

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Spam Prevention In the Pacific Northwest, what state is Portland in?