Quiz: can you match the feature with the famous garden? The unique look of a garden is often created as much by a feature as by plants - be it a water fountain, a grotto, or a folly. Such objects draw the eye and enhance the surroundings, creating a focal point that puts the whole garden into perspective. Our tricky gardening quiz puts you to the test with 10 features, from the UK's oldest gnome to the world's largest treehouse, found in gardens both in Britain and abroad.