From the air, the new garden in the town of Boki Diawe, in northeast Senegal, looks like an eye: wide open, unblinking, and flanked by a smattering of divots dug in the surrounding soil, dark like freckles across a nose. The ground is still sandy brown, but nearby, there is a fringe of bright green. If all goes according to plan, this garden will soon look similarly lush. The circular garden—known locally as a tolou keur—has recently been planted with papayas, cashews, lemons, and more. One of the inner curving…
