Poplar trees are fast growing trees and tall, great as a quick windbreak or screen.
Plant them about 5 to 8 feet apart.
Full sun and moderate to high water requirements.
Because they are such fast growers, they are short-lived, so plant them in front of slower growing windbreaks like arborvitae or cypress trees to protect them while they are young and when the poplar die-off the evergreen windbreak will be in place.
Poplar tree trunks are used as "vigas" in the Southwest, because their wood is light and fairly straight.
Poplar trees do have a few problems, they are susceptible to web worm attack and borers.