An essential ingredient in salad mix with its red and white tight heads. A hardy cool weather crop. Sometimes known as Italian chicory and is a perennial. It is grown as a leaf vegetable which usually has white-veined red leaves. It has a bitter and spicy taste, which mellows when it is grilled or roasted. Radicchio is easy to grow but performs best in spring and fall. It prefers more water and is more bitter if watered infrequently.