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Planting and Maintenance

City of Lake Oswego Oregon Official Website

Seasonal Tree Care Tips: Spring

English ivy is the most common invasive plant in Lake Oswego. It is an aggressive species with no natural enemies that grows and reproduces quickly, outcompetes native plants like wildflowers and ferns, and has vines that commonly grow up tree trunks with detrimental effects. English ivy competes with trees for water and nutrients, deprives tree bark of normal contact with air and microorganisms, and increases susceptibility to wind stress and the risk of canopy or whole tree failure.

Property owners can remove ivy from trees by cutting the vines at chest height in a ring around the trunk with pruners, loppers or saws. Pull the lower portion of the cut vine off of the tree trunk carefully to avoid bark injury, and pull or dig out the attached roots. Clear a 3- to 5-foot ring around the base of the tree to help prevent or postpone re-growth up the trunk. The upper portion of the vines can be left on the tree because it will die back.

Learn more about the detrimental effects of English ivy and how to remove it by visiting these sites:

Factsheet: Ivy Removal in a Home Landscape

Video: How to Remove Ivy

Explore: The Ivy Files

Please check back for more seasonal tree care and maintenance advice!

Please check back for more seasonal tree care and maintenance advice!

Link to Planting and Maintenance Archives
 

Archives -

Fall 2016: Preparing Trees for Winter

Summer 2016: Drought Stress

Winter 2017: Recognizing Tree Risk

Additional Tree Care Resources:

National Arbor Day Foundation The Morton Arboretum
Oregon Department of Forestry Tree Care Info
ISA Find an Arborist Oregon Community Trees
Oregon Department of Forestry Alliance for Community Trees

 

Right Tree in the Right Place

Use this handy guide for assistance in choosing the right species of tree based on the constraints of a site, such as overhead wires, narrow plant strips, and proximity to structures.

"Right Tree Right Place" - helpful information such as "Use this guide for assistance in choosing the right species of tree based on the constraints of a site, such as overhead wires, narrow plant strips, and proximity to structures."

"Master Plant List" - a guide to the plants that are acceptable for mitigation requirements in Lake Oswego.