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枳壳又名枸桔,芸香科枳壳属。是灌木状小乔木,多刺、果小、汁酸味苦,无食用价值,但在医药上和柑桔生产中枳壳都具有重要作用。柑桔类中特有的抗寒类型枳壳原产我国,树性强健,耐寒性极强,能耐—20℃的低温。分布于长江流域,北起河北、山东,南至广东、广西均有栽培,以华中一带最多。由于它具有独特的抗寒本领,成了世界上最抗寒的柑桔砧木。用它作砧木嫁接的温州密柑,能够抵抗—9℃的低温,使柑桔栽培区域大大向北推移,使得我省北部以至上海那样冬季寒冷的地区,也能种上较耐寒的温州密柑。
Citrus aurantium also known as citrus, Rutaceae Citrus aurantium. Shrubs are small trees, prickly, small fruit, sour juice bitter taste, no food value, but in medicine and Citrus aurantium shell has an important role. Citrus unique cold type Citrus aurantium native to China, strong tree, cold strong, resistant to -20 ℃ low temperature. Located in the Yangtze River valley, north Hebei, Shandong, south Guangdong, Guangxi have cultivated to Huazhong area most. Due to its unique cold resistance, it has become the most cold-resistant citrus rootstock in the world. It can be used as a rootstock grafted Wenzhou citrus, can resist the -9 ℃ low temperature, so that citrus cultivation area greatly moved north, making the province as the northern part of Shanghai and the winter as cold areas, but also can planted more cold Wenzhou citrus .