Mukilteo’s beauty is largely attributed to our waterfront, and our massive green spaces. They play a significant role in creating the high quality of life we enjoy. Trees are also a valuable resource that provide a variety of public benefits to the community such as stormwater retention, improving water quality, stabilizing slopes and creating wildlife habitat.
Before You Plant:
Wise tree selection and placement of newly planted trees also protects street and sidewalk visibility and clearance, and prevents damage to pavement, sewers and buildings. Properly located trees can greatly enhance property appearance leading to greater value, and could be considered an investment in the future. Consider planting with native species that are adaptable to our climate, conserve water and provide much needed habitat for local birds and animals.
When making tree and shrub decisions, consider how you want your yard/property to look in 20 years.
- Are there power lines near or above the location of the tree?
- Does the type of tree have the capacity to grow taller than the power/utility lines?
- Are there underground utilities that serve your home and have you located them to avoid damage?
- Is the tree considered an invasive species (i.e., poplars and willows) that could develop large tree roots and cause serious damage to sewer pipes and other underground utilities?
- Will the tree be planted too close to sidewalks or driveways whose roots will cause pavement to “heave” as they mature? Repairs to concrete is expensive and is a trip hazard for pedestrians.
- Will the tree be planted too close to buildings and/or homes that can damage the roof or foundation?
Trees Planted Near Power Lines:
A large number of power outages affecting Snohomish County in recent years were caused by trees. Fallen trees and tree limbs that become entangled in lines, wind-blown branches that cross lines as they fall to the ground, and tree limbs that grow into power lines are the major causes of outages, according to the Snohomish County PUD’s Tree Book, A Tree Selection Guide for Planting Near Power Lines. This publication was prepared to provide utility customers with guidelines for appropriate tree selection, placement and management to that trees planted will result in many years of beauty and safety.
Routine Inspection of Trees:
Inspect your trees regularly, especially at the beginning of storm season. Learn to spot the eight warning signs of structure tree defects:
- Tree care history and maintenance
- Excessive lean (i.e., the tree is no longer vertical but leaning one way or another)
- Multiple trunks
- Weakly attached branches
- Cavities/deep pockets
- Cracks in trunk or limbs
- Hangers (broken limbs in trunk)
Need to Trim or Remove The Tree?
Trees Planted Near Power Lines:
Remove anything away from a potential hazardous tree immediately; call the PUD at (425) 783-5579 to request an examination by a certified arborist. For more information about certified arborists, visit International Society of Arboriculture, Pacific Northwest Chapter.
Trees in the Public Right of Way:
Please fill out the Fix It! Public Works Form or call City Hall at (425) 263-8000. Once the service request is started members of the Public Works Department and Planning Department will follow up with you.
Trees on your Property:
If you are seeking permission to remove a tree, please contact the Planning Department at (425) 263-8000. A Planner will visit your property to verify that removing the tree is not a violation of city code. This service is free and can typically be scheduled within 2 days. Please call if you are interested in removing a tree.
Methods to Trim Trees:
Topping: Do Not Top Trees. Tree topping is the practice of cutting large branches in mature trees into stubs or lateral branches or the entire removal of large branches. Other names for topping include “stubbing”, “heading”, “tipping”, “hat-racking” and “rounding over”. Whatever the name, it’s still a bad idea.
According to the International Society of Arboriculture, topping is perhaps the most harmful tree pruning practice known. Yet, despite more than 25 years of literature and seminars explaining its harmful effects, topping remains a common practice.
- Causes stress, which makes the tree more vulnerable to insect and disease infestations;
- Leads to decay;
- Allows trees to be sunburned which causes cankers, bark splitting and death of some branches;
- Creates hazards from the newly grown shoots which are prone to breaking, especially during windy conditions;
- Is expensive because topped trees require frequent high-maintenance pruning practice (as often as annually while untopped trees only require infrequent pruning); and
- Destroys the natural form of the tree which creates poor aesthetics for the neighborhood.
Thinning: Retaining the natural form of the tree by removing foliage evenly throughout the canopy to create a filtered view through and beyond the foliage. Care must be taken not to remove too much foliage (less than ¼ of the total canopy) in order to avoid sucker growth.
Windowing: A pruning technique that involves selectively removing branches to allow a full view through the tree, similar to looking through a keyhole to a view beyond.
Skirting: A pruning technique where the lower branches of a tree are removed in order to achieve a view looking under the foliage. In order to make sure the tree remains healthy, it is important not to over-do branch removal. No more than 1/3 of the tree’s total height in branches should be removed.