Gardening in California: Zones 8–10 Regional Guide

title: "Gardening in California: Zones 8–10 Regional Guide"

California contains more distinct gardening climates than any other state. The UC Cooperative Extension uses the Sunset Western Garden zones system (24 zones, of which 20 are in California) rather than relying solely on USDA zones, precisely because USDA zones only measure winter minimum temperatures—a metric that fails to capture the differences between a foggy San Francisco summer (rarely above 65°F), a Central Valley floor in August (routinely above 105°F), a South Coast beach garden (almost never freezes), and a San Bernardino mountain community at 6,000 feet (zone 7).

This guide uses USDA zones as a framework (because that is the standard used on this site) but acknowledges that within California, the difference between a coastal zone 9 and an inland valley zone 9 is enormous. Where distinction matters, it will be noted explicitly.

This guide draws primarily on University of California Agriculture and Natural Resources (UC ANR), UC Cooperative Extension, UC IPM, and the California Department of Food and Agriculture.

Table of Contents

1. California's Climate Regions and USDA Zones
2. Soil: From Valley Clay to Decomposed Granite
3. First and Last Frost Dates
4. Seasonal Planting Calendar
5. What Grows Best in California
6. What Does Not Work
7. Pest Pressure
8. Disease Pressure
9. Native Plant Recommendations
10. Frequently Asked

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