Seedville 250 SWEET WALLA WALLA ONION Allium Cepa Vegetable Seeds by COLOR: Golden skinned with white flesh HARVEST: 115 Days PLANT HEIGHT: 12 - 18" . . . PLANT SPACING: 12 - 18" LIGHT REQUIREMENTS: Sun . . . SOIL / WATER: Average - Dry These large sweet onions have a mild flavor. They have been our most popular onion variety for years. Walla Walla is a large onion measuring approximately 4 inches wide. They are great for salads, sandwiches, stir fries, or caramelized. The Walla Walla Onion is also an over-wintering variety.