Vertical farm cuts energy use 75 per cent by using sunlight

Walking into the latest greenhouse run by vertical farming firm Eden Green on the outskirts of Dallas, Texas, I’m greeted by floor-to-ceiling partitions of lettuce. The greenhouse is heat, vibrant with daylight and busy with staff tending to the greater than 300,000 heads of romaine, butterhead and crimson oak rising in hydroponic pots.

“It never stops growing,” says Jake Portillo, the corporate’s head grower, as he exhibits off the stringy taproots of a romaine virtually …