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San Diego County, California Hardiness Zones - Plantmaps
The 2023 USDA Plant Hardiness Zones Map for San Diego
San Diego, CA USDA Hardiness Zone Map & Planting Guide
What USDA Hardiness Zone Is San Diego? (A Guide to San Diego Gardening)
Planting Charts and Calendars — San Diego Seed Company
USDA Plant Hardiness Zone Map - SanDiegoCounty.gov
California Interactive USDA Plant Hardiness Zone Map - Plantmaps
Growing Guides – Master Gardener Association of San Diego County
San Diego County Plant Atlas Home Page