Celtis koraiensis, commonly known as the Korean hackberry is a deciduous tree in the genus Celtis. The species is endemic to the Korean Peninsula and the north of China. It is typically found in altitudes of 100 to 1,500 metres (330 to 4,920 ft).
The tree flowers from April to May, and the fruit ripens from September to October. It can grow up to 15 metres (49 ft) in height.
Once the seeds of Celtis Koraiensis go dormant, a process of cold stratification along with the addition of Gibberellic Acid (GA(3)) can be done to germinate the seeds. Seeds were able to germinate to a maximum of 45.2% under the conditions of 400 mg GA(3) alternating 4/15 degrees C.
A deciduous tree up to 40 ft high, or a bush; young shoots glabrous. Leaves usually more or less obovate, sometimes roundish or even oval, broadly tapered or rounded and oblique at the base; toothed at the sides, jaggedly and more coarsely toothed (almost lobed) at the broad apex, where the midrib often elongates into a slender, awl-shaped lobe; 2 to 5 in. long, 11⁄4 to 3 in. wide; dullish dark green and glabrous above, strongly and longitudinally veined beneath, downy on the veins; stalk 1⁄8 to 1⁄3 in. long. Fruit roundish oval, nearly 1⁄2 in. long, dull orange, borne on a stalk 5⁄8 to 3⁄4 in. long.
Native of Korea, Manchuria and N. China; introduced to Kew in 1920. In a difficult genus, this is well distinguished by the shape of the leaves and the unusually large fruit. The end of the leaf (often its widest part) has a curiously jagged, bitten-off appearance, quite distinct from the leaves, so far as I have seen, of any other cultivated nettle-tree.
