Allium, Garden Onion, Edible Onion 'Walla Walla Sweet'

Allium cepa

Family: Alliaceae
Genus: Allium (AL-ee-um) (Info)
Species: cepa (KEP-uh) (Info)
Cultivar: Walla Walla Sweet
Additional cultivar information:(aka Siskiyou Sweet)
» View all varieties of Onions and Garlic



Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


12-18 in. (30-45 cm)


6-9 in. (15-22 cm)


Not Applicable

Sun Exposure:

Full Sun


Handling plant may cause skin irritation or allergic reaction

Bloom Color:

Unknown - Tell us

Bloom Time:

Unknown - Tell us



This plant is resistant to deer

Other details:

Unknown - Tell us

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

Patent Information:

Unknown - Tell us

Propagation Methods:

From seed; direct sow outdoors in fall

Seed Collecting:

N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed


This plant has been said to grow in the following regions:

Tilly, Arkansas

Hummelstown, Pennsylvania

Colville, Washington

Kirkland, Washington

Oak Harbor, Washington

Spokane, Washington

Walla Walla, Washington

show all

Gardeners' Notes:


On Jan 27, 2006, Gabrielle from (Zone 5a) wrote:

This is my favorite onion. You really can eat it like an apple. It is so juicy that you'd even have it running down your chin! Don't grow any more than you can eat in a month, because that is about all they will keep. Onions bother my eyes more than most people's; my eyes not only water, but burn so bad that I can't open them for several minutes. These had a minimal reaction.


On Aug 5, 2004, TamaraFaye from Fritch, TX (Zone 6b) wrote:

Info from my seed packet. No personal experience with this onion yet.
"This is an Heirloom variety, brought to Walla Walla, Washington from Corsica at the turn of the 20th century. A large (4-5") sweet Spanish onion with light brown skin and mild, white flesh. Long day type. Not a storage onion. Needs 1 inch of water per week to develop a sizable bulb.

In mild climates, best suited for sowing in late summer for harvest in early summer of the following year. In short-season areas, start indoors late February to early March. Transplant 10 weeks later into row 6-8 inches apart.

Soil temp for germ = 50-85 degress F, days to germ = 4-13, plant spacing = 5-7", days to maruity = 100-110, full sun and a lot of water."


On Aug 4, 2004, Farmerdill from Augusta, GA (Zone 8a) wrote:

A sweet long day onion available from multiple sources. Description from Henry Fields "Mild enough to eat like an apple! Non-pungent aroma, too. Grows to 4 inches across. Long day. 115 days." Acording to Walla there are 60 commercial growers in the Walla Walla Growers Association.