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Growing Evergreen Hardy White in Zone 9b

Allium cepa

✓ Well Suited for Zone 9b
Score: 100/100

🌡️ USDA Hardiness Zone 9b

Subtropical/Mediterranean

USDA 2023 Verified
Growing Season
270-320 days
Winter Minimum
25°F to 30°F
(-3.9°C to -1.1°C)
Last Spring Frost
February 4
50% probability
First Fall Frost
December 26
50% probability
AHS Heat Zone 8-11
91 to 120 heat days per year • High heat stress

Typical regions: Houston area, Central Florida, Los Angeles CA, Phoenix AZ

📊 Data Source:
USDA Plant Hardiness Zone Map 2023 • Frost dates from NOAA station USW00012960 • Last verified: 1/22/2026

✓ Zone Compatibility Analysis

high confidence

Excellent match: 70 days to maturity with 250 days buffer in 320-day season.

Recommendation: Direct sowing and transplanting both viable. Excellent fit for this zone.

💾 Suitability computed by Solara Agricultural Intelligence Platform

📅 Zone 9b Planting Calendar for Evergreen Hardy White

Based on NOAA climate normals for Zone 9b. Dates show 50% probability (average year).

🌱 Start Seeds Indoors
March 12
✓ Database-computed optimal date
🪴 Transplant Outdoors
April 30
✓ Database-computed optimal date
🌾 Direct Sow (Alternative)
2 weeks after February 4
For warm-season crops
🥕 Expected Harvest
July 9
Complete before December 26

💡 Zone 9b Growing Tips

  • • Growing season: 270-320 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 9b Challenges

⚠️Extreme summer heat in desert areas
⚠️Humidity in Gulf Coast
⚠️Rare freezes

✅ Best Plants for Zone 9b

✓Citrus
✓Avocados
✓Tropical fruits
✓Year-round vegetables

❄️ Winter in Zone 9b

Very mild winters with rare light freezes to 25°F-30°F.

☀️ Summer in Zone 9b

Hot summers, often extreme in desert regions. Nearly year-round growing.

🔥 Heat Management for AHS Zone 8-11

This zone experiences 91 to 120 heat days per year with high heat stress.

🌡️Heavy mulching
🌡️Drip irrigation
🌡️Shade cloth
🌡️Heat-tolerant cultivars
🌡️Morning planting

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

Zone 1aZone 1bZone 2aZone 2bZone 3aZone 3bZone 4aZone 4bZone 5aZone 5bZone 6aZone 6bZone 7aZone 7bZone 8aZone 8bZone 9aZone 9bZone 10aZone 10bZone 11aZone 11bZone 12aZone 12bZone 13aZone 13b

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