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The term "Japanese iris" encompasses three species of Irises cultivated in gardens or growing wild in Japan: hanashōbu (Iris ensata), kakitsubata (Iris laevigata) and ayame (Iris sanguinea). Of these three species, I. ensata is the one most commonly referred to as "Japanese iris" outside of Japan.

The bluish purple color of the flowers of the Japanese garden iris is an example of the copigmentation phenomenon.[1]

Hanashōbu at Meigetsu-in
Iris ensata (including Iris kaempferi


The Hanashōbu (ハナショウブ, 花菖蒲?, Iris ensata var. ensata, syn. I. ensata var. hortensis I. kaempferi) grows in the wet land and is the most extensively cultivated variety in Japanese gardens. According to the place where it was cultivated, it is classified into the Edo (Tokyo), Higo (Kumamoto Prefecture), Ise (Mie Prefecture), American (U.S.A.) and other series. It is extensively grown in gardens throughout the temperate zones. Several cultivars have been selected, of which 'Rose Queen'[2] and 'Variegata'[3] have gained the Royal Horticultural Society's Award of Garden Merit.


The Kakitsubata (link to article in Japanese) (カキツバタ, 杜若?, Iris laevigata) grows in the semi-wet land and is less popular, but is also cultivated extensively.

It is a prefectural flower of Aichi Prefecture due to the famous tanka poem which is said to have been written in this area during the Heian period, as it appears in The Tales of Ise by Ariwara no Narihira (note that the beginning syllables are "ka-ki-tsu-ha (ba)-ta"):

Original text Pronunciation Meaning







Kitsutsu narenishi

Tsuma shi areba,

Harubaru kinuru

Tabi o shizo omou

I have come so far away on this trip this time and think of my wife that I left in Kyoto

Kakitsubata at Ōta Shrine, Kyoto, is a National Natural Treasure. It was already recorded in a tanka by Fujiwara Toshinari also in the Heian period:

Original text Pronunciation Meaning



Kamiyama ya ōta no sawa no kakitsubata

Fukaki tanomi wa iro ni miyu ramu

Like the kakitsubata at Ōta Wetland, a God-sent heaven, my trust in you can be seen in the color of their flowers.


The Ayame (アヤメ, 菖蒲, 文目?, Iris sanguinea) is the iris typically growing wild on the dry land in Japan.


Classification Color of flower Leaf Feature of flower Location Flowering time
Hanashōbu Red purple, purple, etc. Distinct artery Shows no net Wet land Early June - late June
Kakitsubata Blue, purple, white, etc. Small artery Shows no net In water or wet land mid-May - late May
Ayame Purple, rarely white Main artery not clear Shows net Dry land Early May - Mid-June

Note: Sweet flag, called Shōbu (ショウブ, 菖蒲) in Japanese, is a plant belonging to the family Acoraceae, genus Acorus, known for its fragrant roots, rather than its flowers.

See also[edit]


  1. ^ Anthocyanin-flavone copigmentation in bluish purple flowers of Japanese garden iris (Iris ensata Thunb.) T. Yabuya, M. Nakamura, T. Iwashina, M. Yamaguchi and T. Takehara, EUPHYTICA, Volume 98, Number 3, 163-167, doi:10.1023/A:1003152813333
  2. ^ "RHS Plant Selector - Iris ensata 'Rose Queen'". Royal Horticultural Society. Retrieved 2013-05-20. 
  3. ^ "RHS Plant Selector - Iris ensata 'Variegata'". Royal Horticultural Society. Retrieved 2013-05-20. 

External links[edit]

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Japanese_iris — Please support Wikipedia.
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77 news items

Kansas City Star

Kansas City Star
Fri, 03 Apr 2015 10:03:45 -0700

Japanese iris is the traditional choice, but many Siberian varieties will give a similar look and are easier to grow in the Midwest. ▫ Chrysanthemums: A popular flower in Japan, the chrysanthemum can be left to loosely grow towards the sun or pruned ...
The Seattle Times
Thu, 18 Sep 2014 06:25:02 -0700

Although these gorgeous irises are hardy to minus 30 degrees, they also are demanding to grow and won't perform well unless you provide the perfect conditions. The No. 1 requirement is moist soil and a sunny location. Japanese iris does best planted ...

SouthCoastToday.com (blog)

SouthCoastToday.com (blog)
Thu, 10 Jul 2014 00:16:05 -0700

One of my favorite water garden plants isn't a water lily or even a plant that's sold at most water gardening stores. But it thrives in the water and even survives the New England winter submerged in my pond. It's Japanese iris (Iris ensata) — a tall ...

The Seattle Times

The Seattle Times
Thu, 05 Mar 2015 05:18:45 -0800

One of the most colorful for summer bloom is Japanese iris (Iris ensata). These extremely hardy perennials feature spectacular flat-topped blossoms that, depending on the variety, can reach 12 inches wide atop 4-foot stems. The flowers come in a ...
Eureka Times Standard
Wed, 11 Mar 2015 22:26:15 -0700

River rock covers the ground so that the wallflower, Japanese iris, heather and daffodils can stand out. The rolling green lawn, surrounded by hydrangeas, escallonia and summer annuals, makes a strong setting for the home. 206 Boyle Drive >> Paula and ...
San Jose Mercury News
Wed, 15 Oct 2014 15:42:54 -0700

Alternatives: Canna species, Japanese iris, laevigata iris. Green fountain grass (Pennisetum setaceum). Alternatives: Oriental fountaingrass, Pennisetum setaceum 'Rubrum,' 'Skyrocket,' 'Fireworks' and 'Fairy Tails,' purple fountaingrass, California ...

The Columbian

The Columbian
Thu, 22 Jan 2015 06:02:15 -0800

This works where water drains slowly, not where water pools for months at a time. Just be aware that bog garden plants do need some drainage and air around their roots. Japanese iris and several varieties of primrose not only do well, they thrive and ...

A News Cafe

A News Cafe
Sat, 31 Jan 2015 08:29:55 -0800

Now is a good time to plant SPRING PLANTED SUMMER BLOOMING BULBS: Gladiolas, Japanese Iris, Dahlias, Clematis, Tuberose, Begonias, Cannes, Oxallis, Peonies & Tree Peonies, and Oriental, Tiger & Asiatic Lilies. While weather remains warm, dry ...

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