There are two mainof carnation: the border varieties (including picotees) which have with smooth petal edges and are grown either outdoors or in in the , and the perpetual flowering carnations with fringed edges to their petals, which are not hardy and must be grown in a cool , preferably on their own. Two other groups of lesser importance must be mentioned. The Malmai-son carnations have large, very double and short calyces. They are rather more difficult to grow than the perpetual flowering type. The and carnations include the marguerite andChabaud groups which usually come true from and are popular for summer bedding.