 The hedges aren't just tourist attractions. With each commission, this architect raises money for various environmental causes. At first, he raised money for the organization that looks after his sister. My young sister's got Down syndrome, so I raised about $10,000. This isn't gardening, he says. It's sculpting. His wife, Philippa, was also an artist, and he says she would have been fascinated by how the hedges have taken off. Do you think you'll keep going?