Paulownia growing very rapidly, more than 10 years of age Paulownia than twice the diameter of the same age, poplar, but a long time to grow, will appear hollow tree trunk.

• 泡桐生长非常迅速，十几年树龄的泡桐要比同龄杨树直径大一倍，但生长时间长了，树干会出现中空。