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云台山区楸树的栽培历史悠久.对其“花而不实”的原因及促进结实的研究表明:“楸树是异花授粉植物,自花不孕,成为楸树不结实的主要原因”,“克服楸树不结实的方法,主要是开展种内、种间杂交,实行异树授粉”,“在选种的基础上,找出生长好的母本”,“生产F_1杂交种子,以提高生产率.”(叶培忠、刘玉莲:1980,促进楸树结实的研究,南京林产工业学院学报,第1期).
Catalpa bungei has a long history of cultivation and the reasons for its “florid but not real” and the promotion of its fruiting research show that: “Catalpa bungei is a cross-pollination plant, since infertility, Catalpa become the main reason” , “To overcome the unpleasant Catalpa tree methods, mainly to carry out intraspecific, interspecific hybridization, the implementation of different trees pollination”, “on the basis of selection, to find a good growth of the mother,” “F_1 hybrid seed production to Improve productivity. ”(Ye Peizhong, Liu Yulian: 1980, promoting the Catalpa bungei study, Nanjing Institute of Forestry Industry, No. 1).