Onion Walla Walla D496A (Yellow) 200 Organic Seeds by David's Garden Seeds Approx 300 late-summer sown and wintered over; 125 spring-sown Non-GMO, easy to grow and hand packed here in the United States by David's Garden Seeds. In the Northwest, which has normal low winter temperatures above -10?F, seed is sown in late August, and a crop of very large, flattened, ultra-mild onions is harvested early the next summer Juicy, sweet, regional favorite Germination rate: 70%