The Amur Cork tree is named for its thick, corklike bark that develops as the tree matures. It is native to central Asia and is named for the Amur River in eastern Asia. A member of the citrus family, the tree grows 25-45 feet and is often wider than it is tall.
The large leaves (14 inches) are pinnately compound and have five to eleven leaflets. The upper surface of the leaf is dark green while the underside is a lighter green. In fall, the leaves change to a greenish-yellow and drop quickly.
In May or June, male and female flowers appear on separate trees. They emerge in erect yellowish-green clusters. Fruit forms only on the female trees. These pea-sized berries add color to the tree in autumn. They are initially green but turn black in October. The berries are not edible.
Amur Cork trees do best in full sunlight and prefer a moist, well-drained soil. They can tolerate dryness and alkaline soil, however. Hardiness Zone: 4-7.