Forget everything you were taught in biology – plants don't need sunlight to grow.
Growing Underground is a farm 33 metres below Clapham, south London, swapping sunlight for LEDs.
"Over the past three to five years, LED development has reached the stage where we can grow without any natural light whatsoever," says Steven Dring, who founded the project with fellow Bristolian Richard Ballard.
"You can even change the light spectrum to cater to the different plants that you're growing."
Growing Underground's focus is on the leafier vegetables, from microherbs to baby leaf salad.
"What's new about the latest lights is that you can stack them very close to the crops, 25cm away, if not closer," says Dring, "so you can layer products and lights on top of products and lights."