Root Cause Seattle

Root Cause Seattle ISA certified arborist and professional tree care specialist, Brian Holers and his team provide an array of tree protection services in the Seattle area.

Brian Holers, certified with the International Society of Arboriculture (I.S.A.) since 1996, launched Root Cause, L.L.C. to provide a more comprehensive approach to tree care than existed previously, and is pioneering below ground tree and root work into the overall care of trees. Brian is one of a very small group of arborists in Seattle skilled to provide tree and root care and related services

below as well as above ground. Good tree, root and soil management from the outset saves money and optimizes tree survival in urban and other environments. Root Cause addresses all aspects of tree and root protection and care, including root and soil mitigation below ground. Commercial and residential Root Cause clients enjoy healthy, long standing, vigorous trees instead of trees that struggle to survive and are weak, diseased and stressed.

08/20/2026

Every summer we are responsible for watering hundreds of trees around Seattle. Newly planted trees are watered in the growing season for the first 5 years after planting. This requires a large watering truck that we fill up to bring to each planting location. Here are some of the behind the scenes considerations for managing those watering projects.

08/07/2026

When a city has thousands of trees to maintain each summer, it’s important to have the proper tools. In Seattle, newly planted trees are watered for the first 5 growing seasons to help them establish strong roots. We use these water bags that have small punctures in the bottom, slowly releasing water over a couple of days. This allows the water to soak deep into the tree roots during these hot summer weeks.

We got to visit the Amazon Spheres in Downtown Seattle. The steel-glass dome houses over 40,000 plants from more than 30...
08/06/2026

We got to visit the Amazon Spheres in Downtown Seattle. The steel-glass dome houses over 40,000 plants from more than 30 countries. The pentagonal hexecontahedron shape forms the exterior made with 2643 panes of glass. The daytime temperature is maintained at 70-72 degrees with 60% humidity to replicate a tropical cloud forest.
Have you been inside this Amazon Office?

08/03/2026

Seattle-based arborist and local tree guy Brian Holers of Root Cause Seattle gave us a tour of his home and pointed out the beauty of the Douglas Fir. They are icons of the Pacific Northwest 🌲

07/29/2026

There is this giant tree in West Seattle that sits on private property, but the roots have damaged the sidewalk on the busy street. It has created a complicated scenario where we want to have a walkable sidewalk and crosswalk, without needing to fully remove the tree. Check out our recent videos for more details on this project.

07/10/2026

Regular people don’t often get to see this part of a tree. The roots of mature trees are HUGE! Only after some air excavation will you see how deep and wide the roots will go to keep a tree upright. Especially in urban environments, city trees will grow in any direction to stabilize.

07/07/2026

We observed this corner and were amazed to see just how impactful a broken sidewalk can be on all types of people. Especially on a busy street, having easy access up and down the curb is imperative. We are in the West Seattle neighborhood inspecting the tree roots underneath the sidewalk.

06/22/2026

These tree grates are absolutely beautiful. They are works of art that were perfect when they were installed. The issue is, over the years, these city trees have outgrown the steel coverings, and have grown into it. We had to come in and remove the grates, and replaced it with porous pavement.

06/09/2026

Planting and identifying trees in Renton, Washington

06/05/2026

What do you think about cities planting fruit trees?

Address

7490 85th Avenue SE
Mercer Island, WA
98040

Opening Hours

Monday 8am - 7pm
Tuesday 8am - 7pm
Wednesday 8am - 7pm
Thursday 8am - 7pm
Friday 8am - 7pm
Saturday 8am - 7pm
Sunday 8am - 7pm

Telephone

+12067999837

Website

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