Prohibited Street Tree List

Prohibited Street and Park Trees List

  • Siberian Elm – non-native, prolific invasive
  • Ailanthus (Tree of Heaven) – non-native prolific invasive, sprouter, allelopathic, difficult to eradicate once established
  • Ash (Fraxinus spp) – threatened by spread of emerald ash borer insect moving from east to west across the continent.
  • Aspen – native, but has a habit of prolific sprouting from root system that can damage lawns and improvements
  • Black Locust- non-native tree, fast-growing, brittle and sheds large branches prolific root sprouter
  • Russian Olive – fast-growing, prolific seeder and re-sprouter, difficult to eradicate

 

Suitable for Parks and Yards in Some Conditions

  • Willow – water-loving, but shallow root system that can uplift asphalt. Do not plant near streets, sidewalks, and underground utilities. Roots on ground surface can make mowing difficult.
  • Silver Maple – fast growing with a shallow root system, do not plant near streets, sidewalks, and underground utilities. Roots on ground surface can make mowing difficult.
  • Black Hawthorn – favored wildlife food source. Has long thorns that scratch and puncture, so it can create an effective hedge barrier and discourage traffic.

 

Discouraged Yard Trees

  • Ailanthus (Tree of Heaven) - non-native prolific invasive, sprouter, allelopathic, difficult to eradicate once established
  • Ash (Fraxinus spp) - threatened by spread of emerald ash borer insect moving from east to west across the continent.
  • Aspen - native, but has a habit of prolific sprouting from root system
  • Black Locust - non-native tree, fast-growing, brittle and sheds large branches, prolific root sprouter
  • Maple, red sunset-this red maple cultivar requires acid soil. Many soils in the Pendleton area are alkaline, and this tree will get started here, but then suddenly dies in 5 or 6 years due to the soil conditions.
  • Pine, ponderosa-conifer. Widespread native tree of the mountains. Discouraged because it is very susceptible to being damaged by sequoia pitch moth when planted as an ornamental tree. 
  • Siberian Elm - non-native, prolific invasive

 

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