From back garden vegetable patches and allotments with decades-long waiting lists to urban rooftop “farms” and vertical kitchen gardens, the grow-your-own revolution is in full swing. Anyone who has tilled the soil will appreciate the diligence and ingenuity of the head gardeners of yore who turned walled gardens into well-oiled food factories, inventing self-sufficiency before the term was even coined. Now, a growing band of brave souls are tapping into the desire to reconnect with…