Japanese Iris List of files and visuals associated with this text. The Japanese iris produces large, flat, flowers up to 6 to 8 inches across, between June and August.
Flower colors are shades of white, lavender, rose, purple, and pink.
The plant grows best in sun or partial shade and in a rich, moist, acid soil. The plants are useful near water and can be left for many years without dividing. Set the plants 18 inches apart. The foliage is 2 and a half feet tall and flowering plants are 3 to 4 feet tall. Seed can be planted outdoors in fall or early winter to germinate in spring.