From back gardens to hi-tech hydroponics, the future of food doesn’t have to be rural From back gardens to hi-tech hydroponics, the future of food doesn’t have to be rural I n 1982, artist Agnes Denes planted 2.2 acres of wheat on waste ground in New York’s Battery Park, near the recently completed World Trade Center. The towers soared over a golden field, as if dropped into Andrew Wyeth’s bucolic painting Christina’s World. Denes’s Wheatfield: A Confrontation was a challenge to what she called