Tree & Shrub Planting and Care in Portland, OR

Quick answer

Healthy trees and shrubs in the Portland metro start with correct planting depth, a wide planting hole, mulch kept off the trunk, and summer watering for the first few years. Fall is generally the best planting time. Many cities, including Portland, Gresham, Lake Oswego and West Linn, regulate tree removal, so check before cutting.

Last updated October 22, 2026

Trees define the Portland metro, from towering Douglas firs and western redcedars to street trees lining older neighborhoods. Trees and shrubs are also the long-term backbone of a landscape, and most of their problems trace back to how they were planted, where they were planted, and how they were pruned. Tree work here also comes with more rules than in many places, so it pays to check before you cut.

Planting it right

Right depth. The root flare, where the trunk widens at the base, should sit at or slightly above grade. Planting too deep is a common cause of slow decline.
Wide, not deep. Dig two to three times the width of the root ball. In slow-draining soil, avoid a deep, amended pit that fills with water like a bathtub all winter.
Match wet and dry. Pick plants that handle soggy winter roots and dry summer soil, or plant on a slight mound where drainage is poor.
Mulch, not volcanoes. A few inches of mulch, pulled back from the trunk.
Water the first summers. Even drought-tolerant natives need regular deep watering through their first dry seasons.

Best time to plant

In western Oregon, fall is generally the best time to plant trees and shrubs. Rain does much of the watering, and roots grow through the mild winter before summer drought. Spring planting works with a reliable watering plan.

Pruning basics

Remove dead, damaged, crossing and rubbing branches first.
Prune spring bloomers such as rhododendrons and azaleas soon after they flower.
Thinning to let more light reach a mossy lawn is often better than heavy cutting.
Never top trees. Topping causes weak regrowth and decay.

Tree permits: check first

Tree rules are a big deal around Portland, and they vary by city:

Portland requires a permit to remove a private tree 12 inches or more in diameter, measured 4.5 feet above the ground, and Heritage Trees have their own rules. Street trees in the planting strip are managed by Portland Urban Forestry, so check before planting, pruning or removing one.
Gresham regulates trees over 8 inches in diameter, with extra protection on hillside, floodplain and habitat properties.
Lake Oswego and West Linn both run tree removal permit programs, and removals may require replacement trees.

Other cities have their own rules. Call your planning department before removing any sizable tree, and confirm who is responsible for the permit before work starts.

Large trees and removals

Landscaping companies plant trees and maintain shrubs and small trees. Large tree pruning, removals and work near power lines belong with a tree service with the right equipment and insurance, ideally with an ISA Certified Arborist. Under Oregon's licensing rules, planting trees requires a Landscape Contractors Board license, while tree removal and stump grinding can be done under an LCB or CCB license.

Invasive plant removal

English ivy climbing trunks, Himalayan blackberry along fences and self-seeding butterfly bush are common in older Portland yards. Ivy can add weight to trees and hide decay. English ivy and butterfly bush (other than labeled sterile types) are on Oregon's noxious weed quarantine. Removal is usually a multi-season job, and bare ground should be replanted before the rains.

Wildfire-aware planting

Homes on the wooded edges of the metro, such as near Forest Park or on forested hillsides, can benefit from defensible space. The Oregon State Fire Marshal recommends gravel or pavers instead of bark mulch within 5 feet of the house, removing flammable plants such as junipers near the home, and pruning trees up to 6 feet off the ground. It offers free defensible space assessments.

When you're ready, request a landscaping company for planting, pruning or ivy removal.

Frequently asked questions

Do I need a permit to remove a tree in Portland?

For a private tree 12 inches or more in diameter, measured 4.5 feet above the ground, generally yes. Street trees and Heritage Trees have separate rules. Check with the city before any removal.

Should I remove ivy from my trees?

Generally yes. English ivy climbing trunks adds weight, hides decay and spreads into natural areas, and it is on Oregon's noxious weed quarantine. Cutting vines at the base and pulling ivy back from the trunk is a common first step.

When should I prune rhododendrons?

Rhododendrons and azaleas form next year's flower buds after blooming, so light pruning soon after they flower avoids cutting off next spring's blooms.

Sources and further reading

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