Apaz: small with green stalks
Italian red: flattened with definte ridges and think layers, purple inner layer, sweet and crunchy
Spanish: mild globe onions
Vidalia: sweet, mild flavor
Walla Walla: sweet, jumbo sized, round
Italian red: April to August
Pearl: July to March
Spanish sweets: January to March, August to September
Vidalia: April to June
Walla Walla: June and July
Look for onions that are dry, solid, and shiny with thin skin. The skin around the neck should be tightly closed, and the outer skin should have a crackly feel and a shiny appearance. Avoid onions with green areas and with dark patches.
Whole onions should be kept in a cool, dry, open space, away from bright light. They will last a few weeks. Refrigerate in the crisper wrapped in foil for long term storage. Do not store near potatoes.