California climate, water & plant-palette drivers
- USDA hardiness zone: 5a-11a — drives plant-palette selection and frost-survival ratings
- Annual rainfall: 22 inches/yr — drives irrigation system sizing
- Growing season: 280 frost-free days per year
- Drought tier: Extreme — multi-year drought cycles drive xeriscape adoption + statewide turf restrictions
- Irrigation dependency: Very high — 60%+ of residential outdoor water for irrigation
- Frost-line trench depth: 6-inch design minimum for irrigation backflow + bed prep
- Dominant residential aesthetic: Coastal-mediterranean — Pacific NW natives or California Mediterranean palette
- Wildfire defensible-space rule: Statewide WUI defensible-space requirement on every property in fire-hazard zones
California licensing, pesticide & permits
- License status: Statewide license required
- License board: California Contractors State License Board — C-27 (Landscaping) (official site)
- Permit: no permit required for landscape install on existing yards; CSLB C-27 license required above $500 contract; CDFA Pest Control Business License required for any pesticide application; CAL FIRE defensible-space inspection mandatory in WUI-mapped State Responsibility Area
How landscape installation costs vary in California
State-specific code or insurance rule: California Government Code §65595 and the Model Water Efficient Landscape Ordinance (MWELO) impose the most restrictive residential landscape water rules in the country — every new California residential landscape installation greater than 500 sq ft must submit a Landscape Documentation Package showing Water Budget compliance with ETo-based plant factors, hydrozone separation, and CIMIS-verified irrigation efficiency, with cities including Los Angeles, San Diego, San Jose, Sacramento, and Fresno separately enforcing turf-replacement rebate programs and ornamental-turf removal mandates on non-functional residential turf areas.
Cities in California
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