Root Cause Seattle

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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.

10/13/2026

What’s in the arborist’s toolkit episode 49 - Soil Probe

10/07/2026

It’s that time of year again 🍁

09/28/2026

Certified Arborist, Brian Holers, has transplanted many trees over the years. On rare occurrences, he has opted to bring discarded trees to his own property. In a recent series, we covered all the trees and their stories. But this he talks about two trees that didn’t make it a full year after transplant.

Depending on the season, an arborist will use different parts of a tree to identify it. We are sometimes referred to as ...
09/23/2026

Depending on the season, an arborist will use different parts of a tree to identify it. We are sometimes referred to as "Nature's Detectives." In the spring and summer, leaves are the most obvious clue. But when fall and winter come around, we are also looking at buds, twigs, bark, branch patterns and occasionally looking at the pith.

09/18/2026

It’s convenient that our dirty job unintentionally waterproofed our pants. A helpful thing when working outside in Seattle.

09/17/2026

We love spending time in our local Arboretum because we get to see plants and trees that aren’t as common. One example is this Chestnut Oak (Quercus Michauxii)

09/10/2026

A fun fact about Salal (Gaultheria shallon) is that you’ll often find it growing underneath Cedar Trees. Do you have any native plants you love?

09/02/2026

What’s your favorite tree on your property? One of the best perks of being a certified arborist is the access to incredible trees that sometimes need to find a new home. A few times over the years, I’ve taken the privilege of moving those trees to my own home.

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.

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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