Basil, Thai basil, or sweet basil, is a common name for the culinary herb Ocimum basilicum of the family Lamiaceae (mints), sometimes known as Saint Joseph's Wort in some English-speaking countries. While most common varieties of basil are treated as annuals, some are perennial in warm, tropical climates. Basil is commonly used fresh in cooked recipes. In general, it is added at the last moment, as cooking quickly destroys the flavor.