On a frigid day in December, the slightly warm air inside one of the high tunnels, also known as natural greenhouses, at Foot Print Farms in Jackson contrasts the chilly air outside.
Despite the cold weather and a recent fall drought, domestic plants, such as spinach and mustard greens, and exotic ones, such as callaloo and pumpkins from Jamaica and mizuna from Japan, grow vibrantly in large wooden planters.
Two tall cylinders with herbs growing out of them sit against a far wall. Every 30 minutes, a low whir rings out as the water pump turns on. The cylinders, which contain herbs such as parsley and basil and greens such as lettuce, are used in a relatively new farming technique called aeroponics, in which growers suspend plants in the air instead of planting them in soil.