Family: Scrophulariaceae

Native to China and eastern Asia, these six species of large, deciduous, spreading trees are grown for their beautiful, jacaranda-like flowers and handsome foliage. Similar to Catalpa in many ways, they differ in having alternate leaves, rather than opposite leaves. The blueish violet to white flowers are borne in spiky clusters prior to the foliage.

Species

P. fortunei, from China, grows in a conical shape to between 6 and 13 m (20-43 ft), generally spreading with age. The ovate leaves, to 25 cm (10 in) long, are downy on the under-sides, and the light purple flowers have purple and white throats.

P. tomentosa, princess tree or Royal paulownia, originates from China. In Asia, it is grown for its timber, which is used in cabinet-making. The most commonly cultivated species, it may reach a height of 15 m (50 ft). It has large, downy, heart-shaped leaves, up to 30 cm (12 in) long, and highly fragrant, blueish violet flowers. This is a very adaptable species and will take a polluted atmosphere in its stride.

Cultivation

Paulownias do well in any reason-ably rich, light soil, with some protection from wind. They are generally very fast growing. Al-though these trees enjoy cool climates, the flower buds can be damaged by late spring frost. These trees can be grown as shrubs by poi-larding them in early spring each year. They will produce very large leaves but will not flower. Propagate from seed sown in spring or autumn, or from root cuttings in winter, both in a garden frame.

Climate

Zone 6 for P. fortunei; zone 5 for P. tomentosa.