The BBC’s Big Allotment Challenge might not have quite reached the same dizzying height of popularity as The British Bake Off but it did manage to land a second series, showing we Brits have an appetite for gardening as well as cakes and biscuits. Those who are not blessed with large lawns need to seek space for seeds and saplings where they can. According to the Guardian, an increasing number of city dwellers are using alternative methods such as vertical growing to ensure they can still get their gardening fix. They coined the phrase rurbanite for the hip young things who are going green-fingered on their apartment balconies but there…