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

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