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在山东兖州进行的白花泡桐苗期试验表明：（１）不同种源的白花泡桐苗高和地径差异显著，地点对苗高的影响大于对地径的影响；（２）温度是白花泡桐生长的主控因子，其中低温对生长的影响最大；（３）对３５°Ｎ的栽培北界，较为适宜的白花泡桐是来自湖北薪春和河南罗山的种源。
The results showed that: (1) There were significant differences in seedling height and diameter of Paulownia tomentosa from different provenances, and the effect of location on seedling height was greater than that of ground diameter; (2) The temperature was the growth of Paulownia involucrata (3) For 35 ° N cultivated northern boundary, the more suitable P. bungeana was derived from the sources of safflower in Hubei Province and Luoshan in Henan Province.