Also known as "wild marjoram," oregano is the leaf of the plant Origanum, a member of the mint family. Oregano's flavor and strength vary widely according to the climate and region where it is grown. The hot and dry Mediterranean climate yields a robust, full flavor with a slightly bitter and peppery taste. The cooler regions of Europe and North America yield a more delicate aroma and sweeter taste. McCormick's oregano is available in whole leaves or ground form. The oregano leaves are carefully selected to insure consistency in size, color and flavor.