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泡桐在生长上有一个特点,在泡桐主茎和分枝上分别有顶芽、腋芽,顶芽每年落叶后,均因组织不充实而枯死,第二年由顶芽以下2—4节的腋芽萌发对生的枝条,形成假二叉分枝,由于愈接近顶端的腋芽发育愈瘦弱,所以,萌发的新梢愈接近顶端生长势也就愈弱,因而,在自然接干情况下,一般腋芽不能形成通直的接干新梢。只有当主茎或分枝受到刺激时(如重截、环割等),由于养分在伤口下部积累,促进下部腋芽萌发,
Paulownia growth has a characteristic, in the Paulownia main stems and branches were the top buds, axillary buds, top buds deciduous leaves each year, due to tissue infiltration and died, the next year from the top buds 2-4 axillary buds Germination of the opposite branches, the formation of false bifurcation, as closer to the top of the axillary bud development more emaciated, therefore, the emergence of new shoots closer to the top of the growth potential will be weaker, therefore, in the case of natural dry, the general axillary buds Can not form straight through the new shoot. Only when the main stem or branch is stimulated (such as heavy cut, circumcision, etc.), due to accumulation of nutrients in the lower part of the wound to promote the germination of the lower axillary buds,