Hawa'iki Agroforestry Project, Holualoa, Hawai‘i In alley cropping, contour hedgerows of fast-growing trees (the feathery-leaf trees above) are regularly cut for organic matter that is applied to the crop. The fast-growing trees on this farm are the nitrogen-fixing species Calliandra calothyrsus and Acacia angustissima. In this case, the crop is jackfruit trees, which are planted in the area between the contour hedgerows.
