For generations this variety has been the pride of Washington States onion-producing region. The famous northwest gourmet sweet onion can be grown from seed. In long and intermediate day areas where temperatures do not drop below -10° F, they can be planted between August 15 and September 1 and overwintered under a light mulch for harvest the following late June or early July. For colder areas it's best to raise seedlings and set out transplants in early to mid April. Not a storage onion.