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用本省白花泡桐和川泡桐优树经人工杂交选育出黔杂１—４号４个优良无性系，苗期比白花泡桐高径生长量分别提高２１．７％－９９．３％和１７．３％－５８．５％；比川泡桐分别提高２８．３％－１３０．０％和１４．８％－５５．１％，以黔杂３号和黔杂４号最佳．经不同授粉方式试验表明，白花泡桐和川泡桐均属自花不孕．
Four elite clones of Qianza 1-4 were bred by artificial crosses of P. paulownis and S. paulownia in this province, and their height growths were increased by 21.7% -99.3% and 17%, respectively. 3% -58.5%; Paulownia paulownia increased by 28.3% -130.0% and 14.8% -55.1% respectively, with Qianza 3 and Qianza 4 being the best. Pollinated by different methods show that white Paulownia and Paulownia Paulownia are self-fertility.