Sakura (Cherry Blossoms) are the national flower of Japan. I really like cherry blossoms. I actually like them so much that the header for many pages on this website (all except for three). They ... well ... blossom in spring.
Azalea are amazing plants that have even found their way into video games such as Minecraft. They can have many colours of petals, such as white, yellow, pink, and even red. Many of their parent species are from Western China. They are not native to Japan, but have been grown in Japan for centuries.
They're some plants that you can find in Japanese gardens.