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Variety fit — Delaware

Can I grow Shiro plum in Delaware?

The verdict

Yes

  • Your zone 7b and typical 1573 chill hours both suit this variety.

Based on Delaware’s main growing area (19901): zone 7b, ~1,573 chill hours. Your exact site may differ — check your ZIP.

The numbers

Shiro requirements vs. Delaware climate
Shiro chill requirement400–500 chill hours
Shiro hardinessUSDA zones 5–9
Delaware average chill (19901)1,573 hours (1,181–1,808 across 10 winters)
Delaware zone (19901)USDA zone 7b
USDA pomological watercolor of Shiro plum
Prunus salicina: ShiroUSDA pomological watercolor, Mary Daisy Arnold, 1911 · USDA Pomological Watercolor Collection

Keep checking

Or the same verdict for another region:

Planting a Shiro in Delaware? Get its care calendar for your exact ZIP code, starting with this month’s tasks for one tree, free.

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Questions

Can I grow Shiro plum in Delaware?
Yes — Your zone 7b and typical 1573 chill hours both suit this variety.

Planting a Shiro? Gear that helps

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Before you plantMySoil mail-in soil test kitLab-grade pH and nutrient analysis with amendment recommendations — worth doing before you plant.View on Amazon →First-year wateringTreegator slow-release watering bag20 gallons drips over 5–9 hours — the easiest way to keep a first-year tree consistently watered.View on Amazon →Bark protectionExpandable trunk protectors (5-pack)Stops rabbit, vole, and mower damage on young bark — cheap insurance for a new orchard.View on Amazon →

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. Shiro Plum — variety specifications — accessed July 2026