How to Choose the Best Onion Varieties for Your Region

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Stephen Albert

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Selecting the right onion variety for your specific climate and growing conditions is crucial for a bountiful and flavorful harvest. Onions vary widely in their day-length requirements, size, flavor, and storage ability, so matching the variety to your region will set you up for success.


Onions near harvest

Onions near harvest

Understanding Onion Types by Day Length​


Onions are categorized by how much daylight they need to form bulbs:

  • Short-day onions: Best for southern regions with mild winters. They start bulbing when daylight reaches 10–12 hours.
  • Intermediate-day onions: Suitable for transitional zones with moderate day length (12–14 hours).
  • Long-day onions: Ideal for northern regions with long summer days (14–16 hours).

Planting the wrong type for your day length can result in poor bulb formation or small onions.


Regional Onion Varieties​

  • Southern Climates (Zones 8–10): Varieties like ‘Texas Early Grano’, ‘Candy’, and ‘Granex’ perform well. These are short-day onions with sweet flavor.
  • Transition Zones (Zones 5–7): Intermediate-day onions such as ‘Red Baron’ and ‘Candy’ thrive here.
  • Northern Climates (Zones 3–5): Long-day varieties like ‘Walla Walla’, ‘Yellow Sweet Spanish’, and ‘Redwing’ are best adapted.

Other Factors to Consider​

  • Storage needs: Some onions store longer; choose varieties like ‘Yellow Granex’ or ‘Redwing’ for winter storage.
  • Flavor profile: Onions range from mild and sweet to pungent; select based on your culinary preferences.
  • Disease resistance: Look for varieties with resistance to local diseases for healthier crops.

My Experience Tip​


In my garden, I match onion varieties not just to climate but to harvest timing and use. For fresh eating, I pick sweet, short-day types in fall, and for long-term storage, I grow hardy long-day varieties.

Regional Onion Variety Selection Chart

Region/USDA ZoneDay Length TypeRecommended VarietiesFlavor ProfileStorage Ability
Southern (Zones 8–10)Short-dayTexas Early Grano, Candy, GranexSweet, mildModerate
Transition (Zones 5–7)Intermediate-dayRed Baron, CandyMild to moderately sweetGood
Northern (Zones 3–5)Long-dayWalla Walla, Yellow Sweet Spanish, RedwingPungent to sweetExcellent (long storage)

The post How to Choose the Best Onion Varieties for Your Region appeared first on Harvest to Table.

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