Instructions: They were the first sweet onions to be available nationally. They were originally available in spring and early summer only, but now are available through fall.

Sweet Imperial: The California version of the Vidalia is grown in the Imperial Valley and is available from April though June. The globe-shaped onions are at least 2 1/2 inches in diameter.

Cippolini: These trendy newcomers are smaller than Vidalias but larger than boiling onions. They are flat, with thin skins and a medium-sweet flavor. They appear in late spring.

Walla Walla: These are the granddaddies of American sweet onions. They are said to have originated from seeds brought to the Pacific Northwest from Corsica at the turn of the 20 th century. Theyre available mid-June to mid-August.

Maui: The famous Hawaiian sweet onions are grown in volcanic soil. Theyre a favorite of tourists and are available from April though December.

AmeriSweet: Grown in low-sulfur soil in the Grand Rapids area, this Michigan sweet onion is round rather than flattened and is about 3 to 4 inches in diameter. AmeriSweets are harvested in September and are available though October.

SpringSweets and 1015 SuperSweets: Both were developed at Texas A & M University to help Texas farmers cash in on the sweet-onion craze.

OSO Sweets: South America, especially Chile, began growing these onions in 1989 to provide sweet onions to the American market in the off season. Theyre available from January through March.

Rio Sweet: Another South American sweet onion, this variety is available from October through December.

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