Mercer Island

Welcome to Mercer Island, an island city in Lake Washington connected by I-90 between Seattle and Bellevue. Our mild Puget Sound climate creates a unique setting where homeowners must navigate both beautiful landscapes and specific environmental challenges.

Climate & Growing Conditions

We sit within USDA hardiness zone 8b, with the marine shoreline moderating winter and summer temperature extremes to protect our plants from harsh fluctuations. The soil is often mixed marine and glacial material that can be sandy near shore or poorly drained closer to the water, which influences how trees establish roots and when lawn work should occur.

Native Trees & Plants

You will find Douglas fir, western red cedar, shore pine, and Pacific madrone growing naturally along our shores. Underneath these giants, you may see bigleaf maple accompanied by an understory of salal, oceanspray, and sword fern that thrive in this coastal environment.

Common Tree & Lawn Issues Here

Local trees face risks like needle cast on firs, root-rot fungi in saturated soils, anthracnose on maples, and wind throw during winter storms. Lawns often struggle with moss in shaded areas, red thread disease, leatherjackets feeding on turf, and poor drainage caused by heavy winter rains.

Seasonal Care Calendar

Late winter offers the best time for dormant pruning and tackling moss before conditions improve again. Spring is ideal for planting new trees, adding mulch, aerating lawns, and overseeding to strengthen your grass against upcoming seasons.

Permits & Local Regulations

Permit requirements vary depending on tree size, species, protected areas, shoreline regulations, critical areas, and local municipal code. Because Washington’s Growth Management Act governs work near wetlands or steep slopes, you should always verify current rules with the local jurisdiction before beginning any project.

Neighborhoods & Areas We Serve

We serve residents in North End, South End, and Town Center across ZIP codes including 98040, while also assisting neighbors in Bellevue, Seattle, and Newcastle. Each neighborhood presents its own unique mix of established single-family homes on larger landscaped lots with very limited commercial development.

Local Landmarks

Our work often takes place near the scenic Lake Washington shoreline or within Luther Burbank Park where access considerations are common for scheduling tree care. Coastal wind exposure along these landmarks requires special attention to ensure safety and compliance during any land-clearing or maintenance tasks.