Japanese water iris profile

Written by Maggie

Dec 18 2020

Japanese water iris profile

Japanese water iris is native to a marsh or river bank. It’s produced in China, Heilongjiang, Jilin, Liaoning, Shandong, Zhejiang, Korea, Japan and the Soviet Union. This flower is cultivated and has high horticultural value.

Japanese water iris picture

Japanese water iris

Japanese water iris morphological characteristics

Japanese water iris is a perennial herb with fibers left in the leaf sheath around the base of the plant. Rhizomes are stout, obtuse, outlying with fibers remaining in the brown sheath; Fibrous root cordage, gray white, has shrunken horizontal grain. Leaves are striate, 30-80 cm long and 0.5-1.2 cm wide, apically acuminate or long acuminate, base sheath-like, mid veins prominent on both sides. Stems are cylindric, 40-100 cm tall, solid, with 1-3 cauline leaves; japanese water iris has 3 bracts, subleathery, lanceolate, 4.5-7.5 cm long, 0.8-1.2 cm wide, apically acute, acuminate or obtuse, parallel veins conspicuous and prominent, containing 2 flowers; Flowers are dark purple, 9-10 cm in diameter; The pedicel is 1.5-3.5 cm long; Perianth funnel is 1.5-2 cm long, outer perianth lobes obovate, 7-8.5 cm long, 3-3.5 cm wide, claws slender, central depression groove, middle veins with yellow stripes, inner perianth lobes small, erect, narrowly lanceolate or broad, ca.5 cm long, Ca. 5-6 mm wide; Stamens ca. is 3.5 cm, anthers purple, longer than filaments; Style branches are flattened, ca.5 cm long, 0.7 -- 1 cm wide, purple, slightly arched, apex lobes triangular, sparsely dentate, ovary cylindrical, 1.5 -- 2 cm long, ca. 3 mm in diameter.

Japanese water iris capsule is ellipsoid, 4.5-5.5 cm long, 1.5-1.8 cm wide. The tip has a short beak, 6 ribs obvious, from the top down to the maturity of 1/3;Seeds brown, flat, semicircular, margin winglike. 

Japanese water iris growth habit

Japanese water Iris grows naturally in waterside wetlands. It likes warm and humid, strong, cold resistant. The ground stem and leaves do not die completely. The requirement to soil is not strict, grow well with soil quality loose and fertile. 

Japanese Water Iris distribution scope

Japanese water Iris is produced in Heilongjiang, Jilin, Liaoning, Shandong (Kunlun Mountains), Zhejiang (Changhua). A wet spot on a marsh or riverbank. Also produced in Korea, Japan and the Soviet Union.

Japanese water iris

Japanese water iris pest control

Japanese water iris is mainly affected by leaf blight and is sprayed with a 500 times solution of 65% deisen zinc wettable powder. The growing season is affected by thrips and scale insects. Thistle can be sprayed 4000 times with 2.5% deltamethrin emulsion.Scale insects were killed by spraying 40% dimethoate oil 1000 times liquid. 

Japanese Water Iris main value


Japanese water iris is the most popular iris with graceful and elegant flowers. It blooms in May and June. The flowers are large and colorful, and there are many varieties of gardening. Moisture-loving, suitable for the arrangement of a special garden of aquatic irises or in the pool or lakeside ornament, is also a good material for cut flowers. 


Rhizome: pungent, bitter. It’s a little poison. It can clear away heat and relieve food. It's used for food bloating, stomachache, gas bloating and edema.

Japanese water iris