• Trees add visual beauty to any city.D-BASE/Digital Vision/Getty Images
  
  Trees provide a pleasing visual display to any city. They help increase economic stability, fight urban air pollution, reduce the noise level, lower water usage, offer shade to buildings to help lower the greenhouse effect and help to prevent soil erosion, according to the Maryland Department of Natural Resources Forest Service. Choosing appropriate tree varieties is beneficial to the city and its residents.
  
  

Tartarian Maple

• The tartarian maple tree (Acer tartaricum) attain a height of 15 to 25 feet with a width of 15 to 25 feet. Its compact size and height makes the tree an ideal street specimen that can be safely placed beneath or beside power lines, according to the Cornell University. The tree produces either a single trunk or multiple trunks. It may require consistent pruning to remove the suckering growth that forms from the tree's root system if a tree with a single trunk is desired. Plant the tartarian maple tree in full sunlight. In the spring it produces small, greenish flowers. The reddish fruit of the tree follows flowering and measures 1 inch in diameter. It can offer visual interest. In the fall the tree sports yellow and red foliage. The tree is hardy to U.S. Department of Agriculture hardiness Zone 3.
  
  

European Alder

• The European alder tree (Alnus glutinosa) grows to a height of 40 to 60 feet with a width of 20 to 40 feet. The tree is a popular park specimen. It can also be planted in groves as an urban windbreak. It can naturalize in an area through suckering growth. The tree has the ability to fix nitrogen into the soil so grows well in nutrient poor soil conditions. The tree transplants easily and will tolerate urban pollution. It grows best in full sunlight or partial shade. The tree prefers moist soil to establish itself. It tolerates late winter pruning well. A deciduous tree, the European alder produces leaves that measure up to 4-inches long and 4-inches wide. It has no fall color. The leaves simply fall to the ground when the weather turns cold. In the fall the tree does produce 4-inch long catkins that remain even after the leaves fall to the ground and provide visual interest during the winter months. The tree has a rapid growth rate and can produce multiple trunks. It is hardy down to USDA Zone 3.
  
  

Northern Catalpa

• The deciduous northern catalpa (Catalpa speciosa) grows to a height of up to 70 feet with a width of up to 40 feet. The tree produces moderate to rapid growth. A popular park and landscape tree, the norther catalpa has heart-shaped green leaves that measure up to 12 inches long. In June the tree produces an abundance of white, bell-shaped flowers that measure 2 inches in diameter and form long, 8 inch flower cluster panicles. Following flowering bean pod shaped green seed capsules form and dangle from the tree in an ornamental display. Each panicle measures up to 12 inches in length. The tree grows well in full or partial sunlight. It tolerates a wide range of soil conditions. The branches can be brittle and suffer breakage. The tree grows best in USDA Zones 4 to 8. It is a popular street tree for a wide street location.