CCB# 149226

Liscensed | Bonded | Insured

Call us: 503.523.7773

22 years of experience

Certified Arborist


Frequently Asked Questions

Green Planet

About Green Planet Tree Care:

How long have you been in business?

Owner Mark Mangold and his crew have served Portland homeowners and businesses for the last 22 years.

Can I view your license and insurance information?

Yes! Our license number is 149226, and you can independently confirm our status on the state Construction Contractors Board website. We are also happy to share our insurance and bond documentation.

What areas do you serve?

We work across the Portland metro area. This encompasses Multnomah, Washington and Clackamas counties. Suburbs where we work include Beaverton, Hillsboro, Tigard, Tualatin, Lake Oswego, West Linn, Oregon City, Clackamas, Happy Valley, Milwaukie, Gresham and Troutdale. If you don't see your location here, just ask.

Can you prune or remove trees in tight spaces or near sensitive landscaping?

Yes. Green Planet has invested in a backyard aerial lift unit for just this scenario. It can access high-up limbs and narrow spaces that boom trucks can't reach. Plus, it leaves a minimal impact on landscaping and won't damage grass the way heavier equipment can. When trimming or removing trees by hand, our climbers also lower branches and trunk sections by rope to enhance safety and reduce damage to surrounding vegetation.

When are you available?

We're happy to give an on-site estimate or perform routine jobs between 8 a.m. and 5 p.m., Monday through Saturday. That said, we do make emergency calls 24/7 for downed or damaged trees and other dangerous conditions.

Common Tree-Care Questions:

I've heard beetles have become a serious problem in Western forests. How can I tell if my trees are at risk?

Mature mountain pine beetle (Image: CSU Extension)

Sadly, beetle infestations have become pervasive in public lands across several states. The results can be dramatic, with large swaths of dead trees visible in many national forests. Homeowners can take some comfort in the fact that individual trees tend to be less at-risk than dense or overgrown stands. Likewise, bark beetles typically attack trees already weakened by drought or disease.

Oregon is home to several insect species that attack conifers. Most bark beetles are roughly cylindrical, with bodies less than 1/4 inch in length that are brown, red or black. They leave a pattern of small holes in the bark of infested wood, often accompanied by leaking sap or sawdust. Because the beetles tunnel through the inner bark essential to the plant's survival, trees with infested trunks cannot typically be saved and should be removed to prevent the beetles from spreading.

Landowners can help prevent infestation by avoiding root damage, nearby soil compaction and drought stress. Stands should also be properly pruned and thinned to maintain tree health, with dead or dying trees removed promptly. If you suspect an infestation on your property, an experienced arborist can help identify the problem and outline your options. Further information can be found here:

What about Bronze Birch Borers?

Bronze birch borer (Image: US Forest Service/Steven Katovich)

University of Oregon researchers believe this pest became established in Portland in 2003. It can colonize any birch species, although white-barked varieties are more at-risk. As with bark beetles, birch borers tend to attack trees already weakened by drought, injury or other pests. Property owners should be mindful of birch trees' shallow root system that can be easily damaged. Mulching around the base of trees and watering during hot periods also can improve resistance to insects. In stands, dead trees and infested branches should be removed.

The beetles are black, narrow and produce D-shaped holes in the bark. An infestation can kill weakened trees in a single year, but affected birch typically display stunted foliage in the upper branches that progresses over multiple years. The Forest Service offers additional information on identifying birch-borer damage. Green Planet can assess your options for treatment.

What is root rot?

Armillaria "honey fungus" root rot (Image: Derbyshire)

Fir, pine and deciduous tree roots are susceptible to several fungi that thrive in the damp Northwest climate. They can cause stunted growth, diminished crowns, distressed cones, weakened root structures and other symptoms while making trees more susceptible to insect attacks or falling during wind storms. For this reason, it's a good idea to have unhealthy trees evaluated. Tree and stump removal may be necessary to prevent the spread of root rot found in stands.

What about mushrooms?

Not all fungi that infect trees create mushrooms or similar growths, and most that do only produce them during part of the year. That said, armillaria root rot can reveal itself with brown mushrooms that appear at the base of trees in the fall. Annosus fungus can result in “turkey tails” or button-like growths in the bark near the ground. Closely monitor the health of any tree with mushrooms growing near its base.

I've noticed cracks have formed in the bark of my fruit trees during the winter. What's happening?

Bark damage caused by sun scalding (Image: Iowa State University Extension/Tivon Feeley)

Trees become dormant in the winter, in part to protect themselves from cold temperatures. If sections of the trunk are exposed to direct sunlight, they can warm up enough for a layer of the tree known as the cambium to become active again. Once the sun goes down, the return of freezing temperatures can damage this material causing a condition known as sun scalding. Trees damaged in this way should not be pruned the following year. Protecting the bark with commercial products, or even a layer of latex paint, can prevent further damage in the future.