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Allium cepa Walla Walla Onion

Allium cepa Walla Walla Onion is a legendary, long-day sweet onion, renowned worldwide for its colossal size and exceptionally mild, sugary flavor. Growing to about 12 to 18 inches tall with bulbs that can reach 4 to 6 inches in diameter, this variety is the crown jewel of the vegetable garden, perfect for growers in Northern latitudes who desire a gourmet quality onion that cannot be bought in most supermarkets. Unlike pungent storage onions, the Walla Walla has such a low sulfur content that it can be eaten raw like an apple, offering a juicy, crisp texture that defines the summer harvest.

 

Culinary and Practical Uses

  • The ultimate raw eating onion: its lack of bite makes it perfect for thick slices on burgers, fresh salads, and sandwiches where a milder flavor is preferred.
  • Due to its incredibly high water and sugar content, it caramelizes faster and more richly than other varieties, making it ideal for sweet onion jams, glazes, and French onion soup.
  • Best enjoyed fresh or within a month of harvest; it is a "summer onion" meant for immediate culinary gratification rather than long-term winter storage.

 

 Characteristics

  • Foliage: Upright, hollow, blue-green scapes that are vigorous and hardy; essential for capturing the long daylight hours needed to fuel massive bulb expansion.
  • Growth Habit: Biennial grown as an annual; produces huge, slightly flattened globe-shaped bulbs with light golden-brown papery skin and pearly white, succulent flesh.
  • Flowers: Typically harvested before blooming to preserve bulb quality, but if left to overwinter, it produces tall stalks topped with spherical white flower umbels.
  • Seeds: Harvested after flower heads dry; the small, angular black seeds are vigorous and cold-hardy, often started in late summer for overwintering or early spring.

 

Growing Requirements

  • Sun: Thrives in full sun; requires long summer days (14 to 16 hours of sunlight) to trigger the bulbing process, making it ideal for the Pacific Northwest and Northern US.
  • Soil: Prefers loose, fertile, well-draining soil rich in nitrogen; heavy clay should be amended to allow the large bulbs to expand without deformity.
  • Water: Requires consistent, ample watering; because the bulbs have such high-water content, stress from drought can lead to smaller size and increased pungency.
  • Spacing: Plant transplants 4 to 6 inches apart in rows 12 to 18 inches apart to allow the jumbo bulbs ample room to develop.
  • Maintenance: Keep beds meticulously weeded as onions do not compete well; harvest when the tops fall over and dry, and cure for a short period before eating.

 

Shipping Info

Walla Walla Onion seeds ship as fresh, high-quality, viable seeds that are carefully packaged for stability and protection from damage during transit. Prompt shipping supports reliable germination and seasonally appropriate planting.

Growing Zones

3a - 9b
Your Growing Zone:
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1
2
3
4
5
6
7
8
9
10
11

Low Temperature

-10°F

High Temperature

90°F

Fragrant

Yes

Polinator Required

No

Polinator Friendly

Yes

Flower Color

Blue Brown Green White

Growth Rate

Fast

Soil

Loose, fertile, well-draining soil

Moisture

Moderate

Sun Exposure

Full sun

Mature Spread

4 - 6 inches

Mature Height

12 - 18 inches

Bloom Period

Summer

Pruning Time

Early Spring

Pet Safe

No

Perennial / Annual

Annual

Evergreen / Deciduous

Deciduous

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Walla Walla Onion Seeds

Allium cepa 'Walla Walla'

Regular price $4.99
Sale price $4.99 Regular price
12 - 18 inches
4 - 6 inches
Fast
Full sun
Zones 3a–9b
No

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