Even in extremely dry and infertile soils, they can grow into a single-species forest. By fixing nitrogen from the air they increase the fertility of the barren soil, giving other plants the opportunity to grow under their shade and protection, to eventually form a dense mountain forest with a rich diversity of plant and animal species.
極端乾燥、貧瘠的土地上，它可以開出純林，讓頑土肥沃度增加，其他植物得以在它的遮陰下成長，變成林木森森、物種豐富的山林。