柳是杨树科柳属植物,主要有旱柳和垂柳两种,一般北方地区多种旱柳,而南方则以垂柳的种植最为广泛。史载:隋炀帝巡幸江南,令随从沿途植柳,并赐姓为“杨”。为此后世多将柳树称为“杨柳”,或者干脆呼柳为“杨”。自古以来,我国人民就有爱柳植柳的习惯。《诗经》中就有“折柳樊圃”的诗句。东晋诗人陶渊明不仅爱菊,而且爱柳。他曾在宅旁培植了五株大柳树,并自号“五柳先生”。唐代柳宗元谪居柳州,常以植柳、咏柳自 Willow is Salix genus Salix, mainly two kinds of willow and weeping willow, a variety of common willow in northern China, while the weeping willow is the most widely planted in the south. History contains: Sui emperor patrolled Jiangnan, so follow the path along Liu Zhi, and give surname as “Yang.” For this purpose willow willow called “Willow”, or simply call Liu as “Yang.” Since ancient times, people in our country have the habit of loving Liu and Liu. The Book of Songs contains the poem “Fan Liu Fan Pu”. Tao Yuanming, a poet of the Eastern Jin Dynasty, not only loved chrysanthemum but also loved Liu. He had cultivated five large willow trees beside his house and named him "Mr. Liu Zongyuan lived in Liuzhou in the Tang Dynasty, often with Liu Liu, Yong Liu from