Onion Long Day Walla Walla is a legendary heirloom prized throughout the Pacific Northwest for its exceptional juiciness, remarkable sweetness, and ultra-mild flavor. The traditional Northwest method — sowing seed in late August for an early summer harvest — produces the most impressive results: very large, distinctly flattened bulbs with unparalleled sweetness and tenderness. Where winter temperatures stay above -10°F, overwintered crops achieve superior size and flavor. In colder climates, spring planting from seed or transplants still yields respectable bulbs, though somewhat smaller and less intensely sweet. Also lovely as a "green top" onion. Not a storage variety. Harvest in about 125 days.

Germination Rate: 80%. Test Date: 12/25. WILL.

Texas Minimum Germination Rate: 70%.

Why Choose Walla Walla Sweet Onion?

• Legendary Sweetness: Ultra-mild, juicy flesh with almost no bite — sweet enough to eat like an apple straight from the garden.
• Impressive Size: Very large, distinctly flattened bulbs, especially when overwintered in mild-winter regions.
• Overwintering Champion: Sow in late August where winters stay above -10°F for the biggest, sweetest bulbs of the season.
• Dual Purpose: Excellent pulled young as a "green top" onion or grown on to full mature bulbs.
• Heirloom & Open-Pollinated: Passed down for generations and true to type — save your own seed year after year.
• Non-GMO Seeds: Plants whose DNA has not been altered in ways that do not occur naturally through traditional breeding methods.

Planting Tips for Success

• Day Length: A long-day variety — best suited to northern latitudes where summer days reach 14–16 hours. Southern gardeners should choose short-day onions instead.
• Sunlight: Full sun, at least 6 to 8 hours per day.
• Soil: Loose, well-drained, fertile soil rich in organic matter with a pH of 6.0–6.8. Onions resent compacted ground.
• Planting: Sow late August for overwintering, or start indoors 8–10 weeks before the last frost for spring planting. Sow seed 1/4 to 1/2 inch deep.
• Spacing: Thin or transplant to 4–6 inches apart in rows 12–18 inches apart to give bulbs room to size up.
• Watering: Keep soil evenly moist — consistent water is the key to sweet, mild bulbs. Taper off as tops begin to fall.
• Fertilizing: Feed with a nitrogen-rich fertilizer while tops are growing, then stop once bulbs begin to swell.
• Harvesting: Harvest in about 125 days when tops flop over and begin to yellow. Cure in a dry, airy spot, but use promptly — this is not a storage onion.

Why Choose David's Garden Seeds®?

• Veteran-Owned: Supplying premium seeds since 2009.
• GO TEXAN Certified: Supporting local agriculture and communities.
• Integrity Pledge: David's Garden Seeds has taken the Seed Integrity Pledge.
• Vegetable Seed License: David's Garden Seeds has been granted a Vegetable Seed License for the State of Texas.

Cooking Methods

• Fresh & Raw: Slice thin onto burgers, sandwiches, and salads — mild enough that it never overpowers.
• Grilling: Cut into thick rings or wedges and grill until charred and jammy sweet.
• Roasting: Roast halved with olive oil and a pinch of salt to concentrate the natural sugars.
• Caramelizing: High sugar content makes this variety outstanding for slow-cooked caramelized onions and French onion soup.
• Onion Rings: Large flat bulbs slice into wide rings that batter and fry beautifully.

Order Walla Walla Sweet Onion Seeds Today

Order yours today and grow your own sweet, mild onions in your spring and fall gardens.

Nutritional Information

(Applies to the harvested onion bulb, not seeds. Per 1 cup chopped raw onion, approx. 160g.)

• Calories: 64
• Total Fat: 0.2g
• Sodium: 6mg
• Total Carbohydrate: 14.9g
• Dietary Fiber: 2.7g
• Total Sugars: 6.8g
• Protein: 1.8g
• Vitamin C: 11.8mg (13% Daily Value)
• Vitamin B6: 0.2mg (12% Daily Value)
• Folate: 30.4mcg (8% Daily Value)
• Potassium: 234mg (5% Daily Value)

Important Disclosures

• Variety Disclaimer: Heirloom and open-pollinated varieties may exhibit natural variation in size, color, and maturation. Results may vary based on growing conditions, climate, and gardening practices.
• Seed Storage: Store seeds in a cool, dry location away from direct sunlight. Refrigeration in an airtight container extends viability. Onion seed is short-lived — best sown within 1–2 years.
• Planting Zones: A long-day onion best suited to USDA Hardiness Zones 3–7 and northern latitudes. Overwintering is reliable where winter lows stay above -10°F. Consult your local extension service for zone-specific guidance.

Grow something beautiful. Grow something delicious. Grow with David's Garden Seeds®.