Over 60 years experience | "Large trees are our specialty" | 24 Hour Emergency Service | Free Estimates | (503) 654-3065

Consulting / Certified Arborists

Large Trees Are Our Specialty

Do You Have Tree Questions? We Have Answers!

At Drendel’s Tree Service, our ISA-Certified Arborists® in Portland are here to answer any questions you might have about your trees and landscape. We love talking about general tree care, tree health, and tree pruning.

If you’re worried about a tree on your property or just want our opinion on how to care for your trees, get in touch with us! We’re here to help!

Questions we answer include:

  1. Is my tree healthy?
  2. Is my tree hazardous?
  3. Should my trees be pruned?
  4. Should my tree be removed?
  5. What type of tree should I plant in my yard?
  6. Where should I plant a new tree?
  7. Is my tree, shrub, or bush sick or dying?
  8. Is this tree too close to my house?
  9. How often should I prune my trees?
  10. What types of fertilizer and compost should I use on my trees?
  11. Are termites or other bugs living in my trees?

Our certified arborists are here to provide helpful, useful advice that is both accurate and detailed. You can trust that we know what we’re talking about.

What is an ISA-Certified Arborist®?

Becoming an ISA-Certified Arborist® isn’t easy. It’s a designation that the team at Drendel’s Tree Service is very proud of, but becoming a Licensed, Certified, Forensic Arborist for Drendel’s Tree Service requires the ISA education in addition to years of practical education and hands on experience. Though at over 60 years, Drendel’s is the longest running tree service in the Portland Metro area, our Drendel’s Tree Service team has over 150 years combined professional experience and education as arborists.

Beyond education and experience, our arborist must pass education requirements in:

  • Workplace safety
  • Tree biology
  • Tree pruning
  • Diagnosing and treating tree diseases
  • Tree care and protection
  • Urban forestry
  • Soil management

In order to maintain our status as ISA-Certified Arborists®, we complete continuing education credits that help us stay on top of new advancements in arboriculture and tree care.

Why Work With a Consulting / Certified Arborist?

Only a certified arborist with years of experience can accurately assess your tree and help you develop a tree care plan. A certified arborist can also help you determine if a tree needs to be removed or simply pruned.

In addition, the certified arborists at Drendel’s Tree Service have the skills and equipment needed to safely:

  • Remove trees
  • Grind stumps
  • Excavate roots
  • Climb and prune trees

Finally, our accredited and certified arborists are familiar with all local regulations, requirements, and permits that might be required for a tree care project.

Jon Nash

20+ Years Experience as a Portland arborist

  • ISA-Certified Arborist®: WE-8277A
  • Forensic Arborist
  • Consulting Arborist
  • Master Gardener

Phone: (503) 654-3065

Chris Nash

30+ Years Experience as a Portland arborist!

  • ISA-Certified Arborist®: PN-5588A
  • Forensic Arborist
  • Consulting Arborist
  • Master Gardener

Phone: (503) 654-3065

Other Tree Services

Tree Removal

Tree Pruning

Stump Grinding


While we’re based in the Portland area, we’re available for large tree removal and tree service projects throughout Oregon.


We’re also available to travel to Washington to trim, prune, and inspect large trees.

We’re available 24/7 and are happy to provide a free, no-obligation estimate.

Receive a Free Quote / Talk to a Certified Arborist

Fill out our form or call our Certified Arborists and Master Gardeners to receive a consultation today.

Do You Have Questions For Our Consulting / Certified Arborists?

Call Drendel’s Tree Service Today: (503) 654-3065