Within the rows of the windbreak, large conifer trees should be spaced 16 to 25 feet apart, and small conifers 10 to 15 feet apart. Deciduous trees should be planted 8 to 15 feet apart and shrubs should be planted 3 to 10 feet apart. The distance between all rows should be at least 16 feet. Wide spacing will allow for full development of trees and long windbreak life. Select trees for your windbreak based on your climatic conditions, soil type, drainage, soil pH, and topography of your land.
Evergreen trees work well in the center of the windbreak because they provide year-round benefits.
Deciduous trees can be used in these areas by increasing the number of rows from two to four to provide wind protection in the winter. Use as many species as possible to avoid large losses if your windbreak is attacked by disease or insect pests. The following species are often used in Iowa windbreaks. A well-planned and growing windbreak offers many benefits. Iowa State University , Ames, Iowa.