200 seeds. 115 days. Allium cepa. Biennial.
 
Onion 'Walla Walla' are a large long-day variety of sweet onion. In mild climates, sow these onions in fall to overwinter. Or, sow them in early spring in cooler climates. This onion is not for long-term storage, but it is know as one of the best tasting sweet onions.
 
This onion is named after Walla Walla, Washington where it is the state vegetable. It is an American heirloom that was developed by a French Soldier who brought sweet onion seeds to Washington state from France in the late 1800s. 
 
Here is a link to the history of the Walla Walla onion.
 
Spacing 6 inches.
 
Sowing Onion Seeds: 
 
Sow seeds outdooors 4 weeks before the last frost date. Or, start indoors 6–12 weeks before the last frost date. Sow 1/4 inch deep. Space onions 6 inches apart with 10 inches between the rows. Full sun to part shade.