In addition to aging of the needles, shading is a factor in natural needle loss. Cedars and certain types of spruce have dense foliage that shades the inner needles and contributes to needle loss. The homeowner need not be concerned about natural browning and needle loss from the inner parts of the branches. If, however, loss occurs on the outer ends of the branches of evergreens, remedial action should be taken. The best approach to this problem is first to establish its cause and then to take the appropriate measures.
Needles gradually change from green to yellow to light-brown before they are shed.
The process usually begins at the top of the tree and develops downwards. Some trees may eventually die. A thorough soaking can help to reduce drought stress. If you simply water the lawn with a sprinkler, the tree will not receive enough water. Turn the hose upside down over the holes so that it will soak into the ground.