Walla Walla Onion Seeds
"Walla Walla" onions (Allium cepa “Walla Walla”) produce sweet mild-flavored bulbs reaching 2 to 4 inches in diameter with stalks growing up to 36 inches high.
They are considered a long day onion variety, which means they need 14 to 15 hours of daylight to form bulbs. "Walla Walla" onions are suitable for container growing, which allows the plants to be moved in and out of shelter. Onions in containers grow well in areas that are not normally used for gardening.
Germination temperature: 50 F to 90 F
Days to emergence: 4 to 5
Seed can be saved 1 year. - Longer if stored properly in cool, dry location.
Maintenance and care: Can be direct-seeded, grown from transplants started inside, or from sets -- small bulbs about ½-inch in diameter grown from seed the previous season. Choose a weed-free, well-drained location. Raised beds are ideal. Onions are good for intercropping with other garden plants, especially early-maturing spring greens. Do not plant where other onion family crops have been grown in the past 3 years.
Direct-seeding in the garden may not allow enough time for long-season varieties to mature, but is fine for shorter-season varieties or for scallions - onions harvested before the bulb forms.
Direct-seed in spring when the soil reaches 50 F. Plant seed ¼ inch deep, ½ inch apart, in rows 12 to 18 inches apart. Thin to 4-inch spacings for large bulbs, 2-inch spacings for smaller bulbs but higher yields, or 1-inch spacings for scallions.
Start transplants inside about 8 to 10 weeks before last frost date. Plant 4 or 5 seeds in each cell, or seed in flats ¼ inch deep and ½ inch apart. If tops grow too tall and begin to droop, trim back to about 3 inches tall with scissors. After hardening off, transplant 2 to 4 weeks before last frost date. Space 4 inches apart for large bulbs, 2 inches apart for smaller bulbs, or 1 inch apart for scallions.