|Image source: http://www.ecosnippets.com/gardening/city-asks-couple-to-remove-their-garden/|
... and then an inspector from the city council came 'round and asked them to pull it out, and make it into a grass lawn again? It's a fascinating story.
The story about it is here and the video here.
Also, have you read a book called Fifty Inventions That Shaped the Modern Economy? Its author, Tim Harford, gave an interview to Radio New Zealand National which is available at www.radionz.co.nz/national/programmes/afternoons/audio/201857379/50-things-that-made-the-modern-economy . It's a good listen!