Walla Walla

Family: Amaryllidaceae Vegetable

Planting Schedule

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Sweet, honeyed fragrance rises as soon as you lift the bulb—Walla Walla’s mild, juicy sweetness is the hallmark that makes it a favorite for fresh use.

At maturity, the bulbs form broad, paper-sheathed globes with a clean, crisp bite and a tender, succulent texture that shines in simple preparations. Grow Walla Walla for its dependable 90-day timing and its bright, sweet character that turns everyday salads and fresh toppings into something special.

Light: Full SunMaturity: 90 DaysHabit: Bulbing

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Walla Walla Planting Dates by USDA Zone

Estimated US hardiness-zone windows for sow, transplant, and harvest. Enter a US ZIP above for exact local dates, or open a zone below.

Zone	Start Indoors	Sow / Transplant	Harvest
Zone 1a	Protected Environment Only
Zone 1b	Protected Environment Only
Zone 2a	Direct Sow	May 25th	Aug 23rd – Aug 29th
Zone 2b	Direct Sow	May 15th	Aug 13th – Aug 25th
Zone 3a	Direct Sow	May 15th	Aug 13th – Sep 1st
Zone 3b	Direct Sow	May 19th	Aug 17th – Sep 21st
Zone 4a	Direct Sow	May 15th	Aug 13th – Sep 24th
Zone 4b	Direct Sow	May 13th	Aug 11th – Sep 27th
Zone 5a	Direct Sow	May 8th	Aug 6th – Sep 30th
Zone 5b	Direct Sow	May 4th	Aug 2nd – Oct 5th
Zone 6a	Direct Sow	May 1st	Jul 30th – Oct 10th
Zone 6b	Direct Sow	Apr 25th	Jul 24th – Oct 16th
Zone 7a	Direct Sow	Apr 20th	Jul 19th – Oct 20th
Zone 7b	Direct Sow	Apr 10th	Jul 9th – Oct 28th
Zone 8a	Direct Sow	Apr 1st	Jun 30th – Nov 5th
Zone 8b	Direct Sow	Mar 23rd	Jun 21st – Nov 12th
Zone 9a	Direct Sow	Mar 6th	Jun 4th – Nov 26th
Zone 9b	Direct Sow	Feb 9th	May 10th – Dec 9th
Zone 10a	—	Oct 1st	Dec 30th – Feb 28th
Zone 10b	—	Oct 1st	Dec 30th – Feb 28th
Zone 11a	—	Oct 1st	Dec 30th – Feb 28th
Zone 11b	—	Oct 1st	Dec 30th – Feb 28th
Zone 12a	—	Oct 1st	Dec 30th – Feb 28th
Zone 12b	—	Oct 1st	Dec 30th – Feb 28th
Zone 13a	—	Oct 1st	Dec 30th – Feb 28th
Zone 13b	—	Oct 1st	Dec 30th – Feb 28th

Crop Details

Trait	Value
Days to Maturity	90
Sun Requirements	Full Sun
Growth Habit	Bulbing
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	70
Min Soil Temp (°F)	50
Min Night Temp (°F)	28
Harden Off (days)	7

Culinary Notes

Chef's Note

Walla Walla is the sweet onion you reach for when you want allium flavor without the sting—its crisp, juicy slices stay clean on the palate. Slice it paper-thin, hit it with a quick salt or vinegar, and it turns simple bread-and-butter meals into something you actually taste.

Best Uses

raw slicing for salads and burger toppings—thin enough to stay crisp, not overpowering
quick pickles (vinegar + a little sugar) where it keeps its crunch
charred/roasted wedges so the edges caramelize while the center stays juicy
simple sauté or butter-finish where the sweetness can bloom without browning too hard

Flavor Profile

mild, sweet honeyed aroma juicy snap with a clean, crisp bite tender, succulent texture when sliced thin light, mellow allium heat that stays friendly

Kitchen Pairings

butter balsamic vinegar fresh herbs like parsley or dill blue cheese grilled steak or burgers tomato

Frequently Asked Questions

What’s a common disease or pest problem for Allium cepa (Walla Walla onion) and how do I fix it?

Watch for onion thrips and purple blotch (Alternaria porri), which show up as silvery streaking or purplish spots on leaves and can quickly weaken bulbs. Spray with insecticidal soap for thrips early in the day, and remove badly spotted leaves; improve airflow and avoid wetting foliage when watering. If purple blotch is active, use a labeled fungicide that targets Alternaria on onions and rotate beds so you don’t plant Allium crops in the same soil year after year.

How often should I water Walla Walla onions during the main growing phase?

During active bulbing growth, keep soil evenly moist but not waterlogged—aim for about 1 inch (2.5 cm) of water per week, split into 2–3 waterings during hot spells. When the bulbs begin to enlarge (after tops establish), water deeply only when the top 1–2 inches of soil feel dry, then let excess drain. Stop regular watering once most tops start to flop, so skins can dry and bulbs store better.

How can I tell when Walla Walla (Allium cepa) is ready to harvest?

Harvest when about 50–70% of the plants have fallen over and the necks are starting to dry; at that point the bulbs have usually reached full size (around 90 days from sowing/planting, depending on start type). Lift a few bulbs to check—skins should feel papery and tight, with minimal soft spots. After lifting, cure onions in a warm, airy place out of direct sun until necks are fully dry.