-and with one 
allowed to prow naturally. If, however, you prefer a rather formal effect, or 
the space is too narrow to allow the branches to grow to their natural limit, the 
windbreak may be trimmed. This can be done ns sliown in the accompanying 
sketches, or it can be trimmed in other shapes— such as a triangle, or with a 
round top. 
These sorts are all broad cones in shape. In staggered rows they may be planted 
from five to ten feet apart. The varieties marked with an asterisk (•) are suitable for 
single row plantings where the branches Intermingle, and are also suitable for shearing 
Into formal shape. For single row. small sizes should be planted eighteen inchea apart; 
large sizes, five or six feet apart : Intermediate sizes in proportion. 
SOvor Fir Colorado Blue Spruce 
EVERGREENS FOR WINDBREAKS 
Atlet conoolor 
Picca pungena iglauoa 
*White Spruce 
Pioea alha 
Koster Blue Spruce 
Picea pung. koaterUma 
Engelman Spruce 
Plcea mgelmanni 
Austrian Pine 
Pinus auatriaca 
•Norway Spruce 
Picea eipcelsa 
•White Pine 
Pinua atrohua 
Colorado Green Spruce 
Picea pungent 
•American Hemlock 
7'auga canadenaia 
A single-row Windbreak left to grow 
naturally 
The same Windbreak sheared into 
formal shape 
