关键词: 玉米, 玉米, 籽粒深度, QTL定位, 上位性效应

Abstract: Perennial flowers are some herbaceous perennials that will keep alive 2 years or more, and will bloom yearly since they mature. As a virescence resource with some advantages in various species, well-adapted, economy, strong community function, perennial flowers become more and more important in garden industry. Through the literature and data analysis，as well as field research in Beijing, Shanghai, Qinhuangdao, Wuhan, Kunming and Xiamen, the author elaborated the cultivation and application of perennial flowers in major cities of China. And summarized the perennial flowers’ characteristics which cater to the trends in landscaping now. The author also pointed out the problems with single variety, extensive cultivation and blindness introduction appeared in the application of perennial flowers and issued recommendations on increase intraduction, establish perennial-flower expert systerm , build perennial-flower specialized garden and emphasis on ecological security.