进入冬季,北方已是万木凋零,而桂花不但叶色常绿,枝头上还挂着鲜嫩的果实,这种景观以前很少见(图1)。桂花原产我国西南地区,在长江流域生长良好,北方少数地区可以露地栽植,但难以长成乔木,更难见到果实。2006年,陕西省宝鸡市植物园发现桂花结果,另有报道在同处北方的山东省日照市也有桂花结果。为什么近年北方的桂花能够一改往日状态而结果呢?桂花一般9～10月开花(四季桂除外),果实紫色,翌年4月成熟。桂花通常长到10年以后才能结果,果实种子少,主要靠嫁接和扦插等无性方式繁殖。桂花喜温暖湿润的气候,喜光稍耐阴,对土壤要求不严。在秦岭以南可见到12米高的乔木,秦岭以北多是灌状植株。 Into the winter, the wood is already withered in the north, and sweet-scented osmanthus not only leaf color evergreen branches hanging fresh fruit, this landscape was rare before (Figure 1). Osmanthus native to China’s southwestern region, growing well in the Yangtze River valley, a small number of northern areas can be open-planted, but difficult to grow into trees, harder to see the fruits. In 2006, the results of sweet-scented osmanthus were found at the Botanical Garden of Baoji City, Shaanxi Province. In addition, osmanthus fruit was also reported in Rizhao, Shandong Province, in the same place. Why in recent years the northern osmanthus can change the past status and the result? Osmanthus generally flowering from September to October (except for seasons), purple fruit, mature in April the following year. Osmanthus usually grow to 10 years after the results, less fruit seeds, mainly by grafting and cutting propagation and other asexual ways. Sweet-scented osmanthus warm and humid climate, hi light slightly shade-tolerant, lax requirements of the soil. In the south of the Qinling Mountains can see the 12-meter-high trees, mostly north of Qinling irrigation plants.