Actually Japanese Gardens would have to look Japanese as it is their art form. Because we all know that a stone lantern didn't just show up naturally on a mossy island. I think they just tamed what they have growing naturally in Japan. Stone, water, moss, pine, azaleas, and made an area pretty with function as they walked to their prayer temples. And they needed some type of lighting, so they used granite stone to hold whatever type of fire they had and Japan has an abundance of bamboo which came in very handy for all of their plumbing and building structure. Fish came about naturally as well, they grew carp for food and noticed mutations of gold and orange carp. Or they got their Koi from China. Although I think the gardens look very natural in Japan, since their mountain sides have all that greenery, maples, and lots of water.