Bill Mollison - Source: permacultureprinciples.com
"When planning windbreaks, consider:
Trees that give multiple function, e.g. mulch (Casuarina), bee nectar (dogwood), sugar pods for animals (carob, honey locust), edible leaves (Leucaena, tagasaste), berries for poultry (Coprosma repens, Russian olive).
The windbreak planting itself may need initial protection and care (nutrients, water, weeding, or mulching).
If the winds are very severe, look around the area to see what stands up to it, and plant it whether it provides multiple function or not. Plant more useful plants in its lee. Protection includes fencing, earth banks, tire walls, etc.
Choose a windbreak configuration that is effective for the particular design situation. In tropical and subtropical areas, a thin-crowned windbreak in crop can be used to advantage, providing shade and mulch for vegetable crop."
