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Iris pseudacorus - L.
                 
Common Name Yellow Flag, Paleyellow iris
Family Iridaceae
USDA hardiness 5-8
Known Hazards The leaves, and especially the rhizomes, of this species contain an irritating resinous substance called irisin. If ingested this can cause severe gastric disturbances[274]. Plants can cause skin irritations and allergies in some people[238].
Habitats Damp marshy areas, swampy woods and in shallow water or wet ground on the edges of rivers and ditches[17]. Often found in shady places[4].
Range Europe, including Britain, from Norway south and east to N. Africa the Caucasus and W. Asia.
Edibility Rating  
Other Uses  
Weed Potential Yes
Medicinal Rating  
Care
Fully Hardy Moist Soil Wet Soil Water Plants Semi-shade Full sun

Summary
Bloom Color: Yellow. Main Bloom Time: Late summer, Mid summer. Form: Spreading or horizontal, Upright or erect, Variable spread.

Iris pseudacorus Yellow Flag, Paleyellow iris


http://commons.wikimedia.org/wiki/File:Illustration_Iris_pseudacorus0.jpg
Iris pseudacorus Yellow Flag, Paleyellow iris
http://commons.wikimedia.org/wiki/User:Caronna
   
Physical Characteristics
 icon of manicon of flower
Iris pseudacorus is a PERENNIAL growing to 1.5 m (5ft) by 2 m (6ft) at a medium rate.
It is hardy to zone (UK) 5 and is not frost tender. It is in flower from May to July. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Bees, hoverflies.The plant is self-fertile.
Suitable for: light (sandy) and medium (loamy) soils. Suitable pH: acid, neutral and basic (alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It prefers moist or wet soil and can grow in water. The plant can tolerates strong winds but not maritime exposure.

Synonyms

Habitats
Woodland Garden Sunny Edge; Dappled Shade; Meadow; Pond; Bog Garden;
Edible Uses
Edible Parts:
Edible Uses: Coffee.

The seed is said to make an excellent coffee substitute as long as it is well roasted[2, 7, 61, 105, 115, 244]. Caution is advised, it might be poisonous[177].
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.

Astringent;  Cathartic;  Emetic;  Emmenagogue;  Odontalgic.

The fresh root is astringent, cathartic, emetic, emmenagogue and odontalgic[4, 7, 61]. A slice of the root held against an aching tooth is said to bring immediate relief[244]. It was at one time widely used as a powerful cathartic but is seldom used nowadays because of its extremely acrid nature[4]. It can also cause violent vomiting and diarrhoea[244]. When dried the root loses its acridity and then only acts as an astringent[4].
Other Uses
Dye;  Essential;  Ink;  Tannin.

A beautiful yellow dye is obtained from the flowers[4]. A good black dye is obtained from the root if it is mixed with iron sulphate[4, 115]. It is brown otherwise[141]. The root is a source of tannin[61] and has been used in making ink[4]. A delicately scented essential oil, obtained from the roots, has been used to adulterate the oil of Acorus calamus[245].
Cultivation details
Landscape Uses:Container, Specimen. Prefers a humus rich soil[79]. Succeeds in water up to 15cm deep[24]. Requires a moist soil, especially in early summer. Prefers a position in semi-shade[188]. Plants can be grown in quite coarse grass, which can be cut annually in the autumn[233]. A delicately scented essential oil is obtained from the dried roots[245]. Members of this genus are rarely if ever troubled by browsing deer or rabbits[233]. Some named forms have been selected for their ornamental value[187]. Special Features: Attractive foliage, Not North American native, Invasive, Naturalizing, All or parts of this plant are poisonous, Wetlands plant, Attracts butterflies, Suitable for cut flowers.
Propagation
Seed - best sown as soon as it is ripe in a cold frame[4]. Stored seed should be sown as early in the year as possible in a cold frame. A period of cold stratification improves germination time and rates. 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 in March or October. Early autumn is best[200]. 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
Found In
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 NameCommon NameEdibility RatingMedicinal Rating
Albizia lebbeckSiris Tree, Woman's Tongue, East Indian Walnut12
Albizia proceraWhite Siris, Tall Albizia, Forest Siris12
Bobartia indicaRush Iris00
Gynandriris sisyrinchiumSpanish Nut10
Iris cristataCrested Iris, Dwarf crested iris11
Iris decora 01
Iris douglasianaMountain Iris, Douglas iris00
Iris ensataJapanese Water Iris11
Iris filifolia 10
Iris foetidissimaStinking Gladwin, Stinking iris, Gladwin Iris02
Iris germanicaPurple Flag, German iris, Orris-root, Tall Bearded German Iris, Bearded Iris13
Iris germanica florentinaOrris, Orris-root13
Iris japonica 12
Iris kemaonensis 02
Iris macrosiphonBowltube Iris01
Iris missouriensisRocky Mountain Iris12
Iris pallidaDalmation Iris, Sweet iris, Fragrant Iris, Zebra Iris21
Iris purdyiPurdy's Iris00
Iris sanguineaBlood iris01
Iris setosaBeachhead Iris, Canada beachhead iris, Wild flag11
Iris sibiricaSiberian Iris11
Iris tectorumRoof Iris, Wall iris, Japanese Roof, White Root Iris10
Iris tenaxTough-Leaf Iris, Klamath iris01
Iris versicolorBlue Flag, Harlequin blueflag03
Solanum tuberosumPotato, Irish potato52
Tagetes filifoliaIrish Lace10
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Expert comment
 
Author
L.
Botanical References
17200
Links / References
For a list of references used on this page please go here
Readers comment
 
Elizabeth H.
d g shrubb Wed Dec 3 2008
Is there any herbicide that willkill this invasive plant
Sheldon N.
Apr 19 2015 12:00AM
This plant is considered very invasive where I live and forms dense stands. The main problem seems to be that they trap sediment and/or build soil very rapidly which alters watercourses and drainage patterns. However, they are known to absorb heavy metals (which are also abundant in the water where I live)... Although the heavy metals still exist within the plants and are still harmful if the plant dies and releases them... but having dense stands of this plant in urban areas is essentially like having a landfill: it is space that is used for storing toxins in high concentrations so that the surrounding areas are toxin-free. As long as the heavy metals are stored in living Yellow Flag Iris then there are less around to make it into my garden and drinking water. Make of it what you will, but I personally think these should be allowed to exist wherever there are heavy metal problems (all urban areas).
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Subject : Iris pseudacorus  

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