Kalopanax

This tree, commonly known as the Castor Aralia, is native to Japan and China. The Castor Aralia is highly resistant to pests and is a suitable shade tree. This tree grows fairly quickly and will eventually reach a height varying from 60 to 80 feet. The large, palmate, glossy green leaves of this tree have downy gray undersides, 5 to 7 lobes, and grow from 7 to 14 inches across. They resemble the shape and size of the foliage of the Castor-oil plant. In autumn, the foliage turns a dull, red color. Young Castor Aralia trees are equipped with 1/2-inch thorns, which gradually decrease with age; older trees may not have any at all. In mid-summer, they produce clusters of small, white flowers, which are hardly noticeable among the large leaves. The blossoms are followed by 4- to 6-inch clusters of black berries, which are greatly enjoyed by birds.

Pot Cultivation

These trees can be grown in all areas of the U.S. except right along the West Coast and the Southern Coast (ex. Florida). They thrive in full sun in deep, moist, loamy soil. They should be planted in the spring or fall. Young tree can be pruned in the spring; older trees rarely need it.

Propagation

Cuttings can be inserted in sandy soil in a cold frame in August, or suckers may be detached and planted in the fall or spring. Seeds may also be sown outside in the fall.