The idea for Vertical Veg came to Mark after cycling round London one day, noticing the many empty balconies, rooftops and other concrete spaces. He imagined how wonderful it would be if more of them were filled with pots of herbs, edible flowers and fruit. And the joy it could give to people tending them and to those walking by. His friend Martin came up with the name Vertical Veg to describe his growing – and since then there has been no turning back.