It's a garden based on the Maurice Sendak children's classic, Where the Wild Things Are. You can see Max's bed with the trees as bedposts. It was created by a gardener called Tiggy Salt for the Charities Aid Foundation at the 2007 Chelsea Flower Show. Read all about it here, with lots of detailed photos.
I thnk if I could be any character from fiction I'd choose Max, and yes, he is from fiction, I'm afraid. Max's supper always stands waiting for him, and it's still hot. That's the good thing about dreams, and also the bad thing.