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Variety fit — California

Can I grow French Improved Prune plum in California?

The verdict

Yes

  • Your zone 9b and typical 1018 chill hours both suit this variety.

Based on California’s main growing area (95820): zone 9b, ~1,018 chill hours. Your exact site may differ — check your ZIP.

The numbers

French Improved Prune requirements vs. California climate
French Improved Prune chill requirement800 chill hours
California average chill (95820)1,018 hours (808–1,470 across 10 winters)
California zone (95820)USDA zone 9b
French Improved Prune plumSpecies illustration — no historical watercolor exists for this cultivar

Keep checking

Or the same verdict for another region:

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Questions

Can I grow French Improved Prune plum in California?
Yes — Your zone 9b and typical 1018 chill hours both suit this variety.

Sources

  1. [1] Open-Meteo / Copernicus ERA5. Historical Weather API (hourly 2m temperature) — accessed July 2026
  2. [2] USDA / PRISM (Oregon State University). 2023 USDA Plant Hardiness Zone Map — accessed July 2026
  3. [3] Dave Wilson Nursery. French Improved Prune — DWN Variety Finder — accessed July 2026