楸树是我国具有2600多年栽培历史的乡土树种,为紫葳科楸树属乔木,高可达15-20米。楸树的适生范围很广,自然分布于华北到华南的20多个省市自治区,各地散生有很多百年以上的古楸树。楸树对立地条件要求不严。平原、丘陵、山地、河谷、荒滩均有较好的生长表现,沙土、沙壤土、黄壤土、黄土、轻度盐碱土上也都能良好生长。楸树是城市绿化的优良树种,是营建城市森林的首选树 Catalpa bungei is a native tree species with more than 2,600 years of cultivation history in China. It is a arbor of Aristolochia purpurea and can reach 15-20 meters in height. Catalpa tree suitable for a wide range of natural distribution in North China to South China more than 20 provinces and autonomous regions, scattered around the centuries have many ancient Catalpa trees. Catalpa tree conditions on the site lax. The plains, hills, mountains, valleys and waste beaches all had good growth performance. Sandy soil, sandy loam, yellow loam, loess and mild saline-alkali soils also grew well. Catalpa bungei is an excellent tree species for urban afforestation and the preferred tree for urban forest construction