Acacia nilotica — known as thorn mimosa, scented thorn, Vachellia nilotica, or prickly acacia…is a super plant. It can grow up to 65 feet tall, with a crown as wide. It thrives in poor, dry, and saline soils, adding three-quarters of an inch in diameter each year. It needs little rain. It is resistant to fire. By its fifth year it can produce up to 175,000 seeds annually, and although most of its seeds do not sprout when the pods drop, they still can germinate 15 years later. The seeds are rich in protein. Of all the acacias, the nilotica has one of the deepest rooting systems, up to nine feet, which means it can tap into relatively deep ground water. The horizontal spread of its lateral roots is 1.6 times greater than the umbrella span of its crown. Prickly acacias may stand two dozen feet apart but underground they clasp the soil together in a tight, resilient web. Along a river they create an indigenous natural revetment.
Africans use prickly acacia’s seeds as food flavoring and dye, its glabrous bark for tea, its leaves as fodder and antibiotic, its sap to bind pigment to colored fabric, its twigs as toothbrushes, its thorns as awls, its inner bark and pods to tan leather. It is a nitrogen fixer, so grain yields are richer in its shade.— from The Men Who Planted Trees by Anna Badkhen.
Image: Inland Niger Delta.
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