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Summary
Physical Characteristics
Iris japonica is an evergreen Perennial growing to 0.6 m (2ft) by 1 m (3ft 3in). It is in leaf all year, in flower in April, and the seeds ripen from July to August. The species is hermaphrodite (has both male and female organs) and is pollinated by Insects. The plant is self-fertile.
Suitable for: light (sandy) and medium (loamy) soils and prefers well-drained soil. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It prefers dry or moist soil and can tolerate drought.
UK Hardiness Map
US Hardiness Map
Synonyms
Plant Habitats
Woodland Garden Dappled Shade; Shady Edge; Ground Cover;
Edible Uses
Edible Parts: Root
Edible Uses:
Root - the source of an edible starch[2, 105, 177]. Some caution is advised, see the notes above on toxicity.
References More on Edible Uses
Medicinal Uses
Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.
Miscellany
The rhizome is used in the treatment of injuries[218]. A decoction of the plant is used in the treatment of bronchitis, internal injuries, rheumatism and swellings[218].
References More on Medicinal Uses
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Other Uses
Miscellany
Plants can be grown for ground cover when planted about 45cm apart each way[208].
Special Uses
Ground cover
References More on Other Uses
Cultivation details
Prefers a gritty well-drained soil with plenty of moisture in summer and shelter from early morning sun[1, 42]. Prefers a lime-free soil but succeeds in most good soils[79, 200]. Succeeds in full sun or partial shade[79], but plants flower better in a hot sunny position[190]. Established plants are drought tolerant[190]. Cultivated for its edible root in Japan[2]. A number of named varieties have been selected for their ornamental value[187]. It is best to lift the plant in October, store in sand in a cool frost-free place over winter and plant out in March[1]. Plants have creeping aerial rhizomes that root at intervals[187]. The flowers are susceptible to damage by late frosts, the plants failing to flower after an exceptionally cold winter[187]. Members of this genus are rarely if ever troubled by browsing deer or rabbits[233].
References Carbon Farming Information and Carbon Sequestration Information
Temperature Converter
Type a value in the Celsius field to convert the value to Fahrenheit:
Fahrenheit:
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Plants For A Future have a number of books available in paperback and digital form. Book titles include Edible Plants, Edible Perennials, Edible Trees,Edible Shrubs, Woodland Gardening, and Temperate Food Forest Plants. Our new book is Food Forest Plants For Hotter Conditions (Tropical and Sub-Tropical).
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Plant Propagation
Seed - best sown as soon as it is ripe in a cold frame. Stored seed should be sown as early in the year as possible in a cold frame. Prick out the seedlings into individual pots when they are large enough to handle and grow them on in the greenhouse or cold frame for their first year. Plant out into their permanent positions in late spring or early summer. Division, best done after flowering in July/August. Very easy, larger clumps can be replanted direct into their permanent positions, though it is best to pot up smaller clumps and grow them on in a cold frame until they are rooting well. Plant them out in the spring.
Other Names
If available other names are mentioned here
Native Range
TEMPERATE ASIA: China (Anhui Sheng, Fujian Sheng, Gansu Sheng, Guangdong Sheng, Guangxi Zhuangzu Zizhiqu, Guizhou Sheng, Hainan Sheng, Hubei Sheng, Hunan Sheng, Jiangsu Sheng, Jiangxi Sheng, Qinghai Sheng, Shaanxi Sheng, Shanxi Sheng, Sichuan Sheng, Xizang Zizhiqu, Yunnan Sheng, Zhejiang Sheng), Japan TROPICAL ASIA: Myanmar
Weed Potential
Right plant wrong place. We are currently updating this section.
Please note that a plant may be invasive in one area but may not in your area so it’s worth checking.
Conservation Status
IUCN Red List of Threatened Plants Status :
| Related Plants
|
| Latin Name | Common Name | Habit | Height | Hardiness | Growth | Soil | Shade | Moisture | Edible | Medicinal | Other |
| Albizia lebbeck | Siris Tree, Woman's Tongue, East Indian Walnut | Tree | 15.0 |
10-11
| F | LMH | N | M | 1 | 2 | 4 |
| Albizia lucidior | Potka siris tree | Tree | 15.0 |
10-12
| F | LMH | SN | M | 0 | 0 | 3 |
| Albizia procera | White Siris, Tall Albizia, Forest Siris | Tree | 25.0 |
10-12
| F | LMH | N | M | 1 | 2 | 4 |
| Bobartia indica | Rush Iris | Perennial | 0.6 |
7-10
| S | L | N | DM | 0 | 0 | 1 |
| Gynandriris sisyrinchium | Spanish Nut | Perennial | 0.2 |
7-10
| | MH | SN | DM | 1 | 0 | |
| Iris cristata | Crested Iris, Dwarf crested iris | Perennial | 0.2 |
5-9
| M | LM | SN | M | 1 | 1 | |
| Iris decora | | Perennial | 0.3 |
-
| | LM | N | DM | 0 | 1 | |
| Iris douglasiana | Mountain Iris, Douglas iris | Perennial | 0.3 |
6-9
| | LM | SN | DMWe | 0 | 0 | 1 |
| Iris ensata | Japanese Water Iris | Perennial | 0.6 |
5-8
| M | LM | N | MWe | 1 | 1 | 2 |
| Iris filifolia | | Bulb | 0.5 |
-
| | LM | N | DM | 1 | 0 | |
| Iris foetidissima | Stinking Gladwin, Stinking iris, Gladwin Iris | Perennial | 1.0 |
7-10
| M | LMH | FSN | DMWe | 0 | 2 | 3 |
| Iris germanica | Purple Flag, German iris, Orris-root, Tall Bearded German Iris, Bearded Iris | Perennial | 1.0 |
4-10
| M | LM | SN | DM | 1 | 3 | 2 |
| Iris germanica florentina | Orris, Orris-root | Perennial | 0.9 |
5-10
| M | LM | SN | M | 1 | 3 | 3 |
| Iris kemaonensis | | Perennial | 0.5 |
-
| | LM | SN | DM | 0 | 2 | |
| Iris macrosiphon | Bowltube Iris | Perennial | 0.2 |
-
| | LM | SN | M | 0 | 1 | 1 |
| Iris missouriensis | Rocky Mountain Iris | Perennial | 0.8 |
0-0
| | LM | SN | MWe | 1 | 2 | 1 |
| Iris pallida | Dalmation Iris, Sweet iris, Fragrant Iris, Zebra Iris | Perennial | 1.0 |
4-10
| M | LM | SN | DM | 2 | 1 | 3 |
| Iris pseudacorus | Yellow Flag, Paleyellow iris | Perennial | 1.5 |
5-8
| M | LM | SN | MWeWa | 1 | 2 | 2 |
| Iris purdyi | Purdy's Iris | Perennial | 0.4 |
-
| | LM | SN | DM | 0 | 0 | 1 |
| Iris sanguinea | Blood iris | Perennial | 0.8 |
5-9
| | LM | SN | MWe | 0 | 1 | 1 |
| Iris setosa | Beachhead Iris, Canada beachhead iris, Wild flag | Perennial | 0.6 |
4-8
| M | LM | SN | MWe | 1 | 1 | 1 |
| Iris sibirica | Siberian Iris | Perennial | 0.6 |
4-9
| F | LM | SN | MWe | 1 | 1 | 1 |
| Iris tectorum | Roof Iris, Wall iris, Japanese Roof, White Root Iris | Perennial | 0.3 |
5-9
| M | LM | SN | DM | 1 | 0 | |
| Iris tenax | Tough-Leaf Iris, Klamath iris | Perennial | 0.3 |
0-0
| | LM | SN | DM | 0 | 1 | 2 |
| Iris versicolor | Blue Flag, Harlequin blueflag | Perennial | 0.6 |
4-8
| | LM | SN | MWe | 0 | 3 | 2 |
| Solanum tuberosum | Potato, Irish potato | Perennial | 1.0 |
7-10
| | LMH | N | M | 5 | 2 | 3 |
| Tagetes filifolia | Irish Lace | Annual | 0.4 |
8-11
| | LMH | N | DM | 1 | 0 | 2 |
|
Growth: S = slow M = medium F = fast. Soil: L = light (sandy) M = medium H = heavy (clay). pH: A = acid N = neutral B = basic (alkaline). Shade: F = full shade S = semi-shade N = no shade. Moisture: D = dry M = Moist We = wet Wa = water.
Expert comment
Author
Thunb.
Botanical References
58200
Links / References
For a list of references used on this page please go here
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