The Complete Guide to Poplar: Species Characteristics and Cultivation Uses

Poplar is the collective name for deciduous trees of the genus Populus in the willow family (Salicaceae), and is one of the tree species with the widest distribution and the longest cultivation history in the world. Its trunk is straight and upright, its crown is broad, and its leaves are mostly ovate or triangular with serrated edges. It flowers in early spring before the leaves emerge, with catkins, and is dioecious. Common poplar species include Chinese white poplar (Populus tomentosa), white poplar (Populus alba), David poplar (Populus davidiana), Simon poplar (Populus simonii), euphrates poplar (Populus euphratica), Xinjiang poplar (Populus alba var. pyramidalis), and the introduced Canadian poplar (Populus x canadensis), among others. Of these, Chinese white poplar is relatively common in North China, while euphrates poplar is drought- and salt-tolerant and is mostly found in the desert regions of the northwest. Different varieties differ markedly in morphology and adaptability, so the appropriate variety should be chosen according to local climate and soil conditions when planting. Poplars are light-demanding and fond of water and fertilizer, grow quickly, and are highly adaptable. They are mostly propagated by cuttings or by layering, and raising seedlings is relatively easy. After planting, attention should be paid to timely watering, weeding, and pruning; strengthening water and fertilizer management during the juvenile stage can noticeably promote growth, and at the same time care must be taken to control boring pests such as longhorn beetles. Poplars have a wide range of uses: the wood can be used for pulp and papermaking, engineered wood panels, matches, and more, and it is also a major tree species for establishing shelterbelts, sand-fixation forests, and urban and rural landscaping. Every spring, the poplar catkins released by female trees easily cause respiratory discomfort and pose a fire hazard. In recent years, many places have switched to new varieties with little or no catkin, and such improved varieties can be given priority when planting.