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Growing Evergreen Hardy White in Zone 10a
Allium cepa
✓ Well Suited for Zone 10a
Score: 100/100
🌡️ USDA Hardiness Zone 10a
Subtropical/Tropical Transition
USDA 2023 Verified
Growing Season
300-350 days
Winter Minimum
30°F to 35°F
(-1.1°C to 1.7°C)
AHS Heat Zone 9-12
121 to 150 heat days per year • High heat stress
Typical regions: South Florida, Southern California coast, Southern Arizona, San Francisco CA, Phoenix AZ
📊 Data Source:
USDA Plant Hardiness Zone Map 2023 • Frost dates from NOAA station USW00023183 • Last verified: 1/22/2026
✓ Zone Compatibility Analysis
high confidenceExcellent match: 70 days to maturity with 280 days buffer in 350-day season.
Recommendation: Direct sowing and transplanting both viable. Excellent fit for this zone.
💾 Suitability computed by Solara Agricultural Intelligence Platform
📅 Zone 10a Planting Calendar for Evergreen Hardy White
🌱 Start Seeds Indoors
March 12
✓ Database-computed optimal date
🪴 Transplant Outdoors
April 30
✓ Database-computed optimal date
🌾 Direct Sow (Alternative)
2 weeks after last frost
For warm-season crops
🥕 Expected Harvest
July 9
💡 Zone 10a Growing Tips
- • Growing season: 300-350 frost-free days
- • Excellent match for this zone - both direct sowing and transplanting work well
- • Monitor soil temperature before transplanting (minimum 55-60°F for most crops)
⚠️ Zone 10a Challenges
⚠️Extreme summer heat
⚠️Hurricane risk in Florida
⚠️Drought in Southwest
✅ Best Plants for Zone 10a
✓Tropical fruits
✓Mangoes
✓Bananas
✓Year-round vegetables
❄️ Winter in Zone 10a
Very mild winters with rare light frost to 30°F-35°F.
☀️ Summer in Zone 10a
Hot summers. Nearly year-round growing season.
🔥 Heat Management for AHS Zone 9-12
This zone experiences 121 to 150 heat days per year with high heat stress.
🌡️Extensive mulching
🌡️Automated irrigation
🌡️Shade structures
🌡️Heat-tolerant varieties only
Source: American Horticultural Society
📊 Evergreen Hardy White Quick Facts
Days to Maturity
60-80
Difficulty
intermediate
Season
summer
Type
OP
📍 View Evergreen Hardy White Guide for Other Zones
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