Small courtyard gardens known as tsubo niwas became popular in Japan during the 15th Century. The gardens were common in Japanese cities and were often found at the homes of wealthy merchants. These small gardens are still popular today especially where space is at a premium. These intimate spaces are created to provide a serene entrance to a home and are based on the principles of Japanese Zen Garden.
A pine tree is one of most famous plants in Japanese garden, but it is necessary to leave its maintenance in the charge of some special gardeners. Description from sukiya-japan.com. I searched for this on bing.com/images