Big and tasty, Walla Walla onions are perhaps one of the worlds favorite onions. The Walla Walla Sweet Onion originated on the island of Corsica, off the west coast of Italy. A French soldier named Peter Pieri found an Italian sweet onion seed and brought it to the Walla Walla Valley around 1900. The mild flavor makes this one of the best onions for cooking, or even raw! This sweet onion developed over several generations through the process of carefully hand selecting onions from each year's crop, ensuring exceptional sweetness, jumbo size and round shape. Walla Walla's are adapted to a wide range of temperatures and are frost-tolerant. Onions produce best when cool temperatures (55ï¿½-75ï¿½) prevail for an extended period of time. Sun to part sun, regular watering with well drained soil. 110 days to harvest. Easy to grow, and dear and rabbit tolerant. Growing instructions Start seed indoors 8-10 weeks before last frost in pots, or sow directly into the garden after danger of serious frost has passed. Cover seeds with 1/4 inch of fine soil. 5 to 10 day germination time. Keep soil moderately moist during germination (not soggy). Transplant indoor started seedlings after hardening off and danger of serious frost has passed. Space plants at least 6 inches apart.