Iris ensata ‘Kongo San’ has large dark blue flowers with curled petals June to July. The stems stand 40 inches high, each with a single bloom with no fragrance. Iris ensata, commonly as known as Japanese iris, is native to Japan, China, Korea and Russia. The standards and falls are flatter than those of the bearded irises, resulting in the entire flower being noticeably flatter. These tall, clump forming plants grow well along the edges of streams and ponds where they thrive in rich, moist soil. They are attractive to hummingbirds and butterflies while resistant to deer and rabbits