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Landscaping Rules

Landscaping Rules in Seattle, WA: What Residents Actually Need to Know

By CityRuleLookup Editorial Team

If you live in Seattle or are thinking about moving there, landscaping rules are one of those things you probably won't think about until they affect you directly. Seattle has 2 specific rules on the books covering different aspects of landscaping rules, and some of them might surprise you.

Weed Ordinances

Seattle and King County Noxious Weed Board require control of listed invasive species. English ivy, Himalayan blackberry, and knotweed are top priorities. Salmon-safe landscaping practices encouraged throughout the city.

Key details: Authority: KC Noxious Weed Board. Priority Weeds: Ivy, blackberry, knotweed. State Law: RCW 17.10. Focus: Salmon-safe landscaping.

Notice to abate. City clears at owner's expense ($200 to $1,000+). Noxious weed violations: county enforcement + fines.

Tree Removal & Heritage Trees

Seattle's Tree Protection Code (SMC 25.11, effective July 30, 2023) classifies trees by tier. Tier 2 trees generally cannot be removed except for hazard. Tree removal typically requires SDCI approval. All tree work must be done by a Registered Tree Service Provider (RTSP) since August 2024. Violations: up to 3x tree appraised value.

Key details: Code: SMC 25.11 (effective July 30, 2023). RTSP Required: All tree work since August 2024. Tier 2 Trees: Cannot remove except for hazard or development. Permit: SDCI approval required for most removals. Penalty: Up to 3x appraised value per tree.

Civil fines up to 3x appraised tree value; may exceed $10,000 per tree.

This is not one of those rules that cities tend to ignore. Seattle actively enforces its tree removal & heritage trees requirements.

The Bottom Line

Seattle's landscaping rules rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Seattle is broadly strict or permissive.

All of the above reflects Seattle's municipal code as of our last review. If you need specifics on fines, exemptions, or filing requirements, the detailed ordinance pages linked above have the full breakdown.