The Economic Times

Along a 27-mile ring road, 8 million plants are climbing 2,000 concrete columns, fed by recycled rainwater from the road above, turning 15 acres of dead infrastructure into vertical gardens seen by drivers

Eight million plants now grow on concrete columns along a ring road. These vertical gardens utilize hydroponic felt pouches and recycled materials for growth. Water for the plants comes from collected road drainage and filtered rainwater. Advertising rights fund this innovative project, not city money.