Species Iris (Iris pseudacorus) in the Irises Database

Common names:
Give a thumbs up Species Iris
Give a thumbs up Yellow Flag
Give a thumbs up Fleur-de-Lis
Give a thumbs up Iris

Botanical names:
Iris pseudacorus Accepted
Iris pseudacorus var. bastardii Synonym

Data specific to Irises (Edit)
Classification: Species
Registered Height: 30-64 inches
Bloom Color Classification: Yellow

General Plant Information (Edit)
Life cycle: Perennial
Sun Requirements: Full Sun
Water Preferences: In Water
Wet
Wet Mesic
Flowers: Showy
Flower Time: Spring
Underground structures: Rhizome
Uses: Water gardens
Will Naturalize
Propagation: Seeds: Self fertile
Propagation: Other methods: Division
Other: Can be invasive
Pollinators: Hoverflies
Bees

Image

The Top 25 Water Garden Plants, Selected by ATP MembersThe Top 25 Water Garden Plants, Selected by ATP Members
March 15, 2014

Here's a report of the most popular water garden plants from our database!

(Full article14 comments)
Give a thumbs up

Photo gallery:
Location: Western North CarolinaDate: 2015-05-03
By vic
Give a thumbs up
Date: MayImage by Spencer C. H. Barrett, University of Toronto
By greene
Give a thumbs up
Location: My garden in Warrenville, SCDate: 2018-04-27
By scflowers
Give a thumbs up
Location: Nature Reserve Gent, BelgiumDate: 2009-05-07
By bonitin
Give a thumbs up
Location: Coastal San Diego County Date: 2018-04-24San Diego Zoo
By carlysuko
Give a thumbs up
Location: Nature Reserve Gent, BelgiumDate: 2008-05-17
By bonitin
Give a thumbs up
Photo courtesy of Iris City Gardens
By eclayne
Give a thumbs up
Location: Woodbridge , VaDate: 2018-05-15
By krobra
Give a thumbs up
Location: Nature Reserve Gent, BelgiumDate: 2008-05-17
By bonitin
Give a thumbs up
Date: 2012-06-05
By CLUSIANA
Give a thumbs up
Infestation photograph by Leslie J. Mehrhoff, University of Conne
By eclayne
Give a thumbs up
Location: Gradignan, Gironde, FrancePhoto courtesy of Jean-Jacques MILAN, Wikimedia Commons
By Calif_Sue
Give a thumbs up
Date: 2007-05-07Photo courtesy of: Photo2222
By admin
Give a thumbs up
Location: Karlsruhe, Germany. The plant is used in homeopathy as remedy: Iris pseudacorus (Iris-ps.)Date: 2010-05-30Photo courtesy of: H. Zell
By admin
Give a thumbs up
Location: Ed Burton, NE WisconsinDate: 2015-06-05
By EdBurton
Give a thumbs up
Credit florum
By admin
Give a thumbs up
Location: z5a, Smith College Botanical GardenDate: 2012-05-27Informed they go to great lengths to prevent naturalization.
By eclayne
Give a thumbs up
Courtesy Gardens in the Wood of Grassy Creek
By vic
Give a thumbs up
Location: Iris pseudacorus near pond in Kytin village in Prague-West District, CZDate: 2011-06-14Photo courtesy of: Huhulenik
By admin
Give a thumbs up
Date: 2008-10-23Photo courtesy of: Qwert1234
By admin
Give a thumbs up
Photo courtesy of: Krzysztof Ziarnek, Kenraiz
By admin
Give a thumbs up
Date: 2010-05-30Photo courtesy of: H. Zell
By admin
Give a thumbs up
Location: Karlsruhe, Germany. The plant is used in homeopathy as remedy: Iris pseudacorus (Iris-ps.)Date: 2010-05-30Photo courtesy of: H. Zell
By admin
Give a thumbs up
Location: Orangeburg, SCDate: 2014-04-23Yellow flag Iris
By Deebie
Give a thumbs up
Location: Iris pseudacorus near pond named Bzdinka near Dobris in Pribram District ,CZDate: 2011-06-08Photo courtesy of: Huhulenik
By admin
Give a thumbs up
Photo courtesy of: G.-U. Tolkiehn
By admin
Give a thumbs up
Location: Ebro Delta, SpainDate: 2013-05-27Photo courtesy of: Donald Hobern
By admin
Give a thumbs up
Photo Courtesy of Lazy S'S Farm Nursery.
By Joy
Give a thumbs up
Photo Courtesy of Lazy S'S Farm Nursery.
By Joy
Give a thumbs up
Credit florum
By admin
Give a thumbs up
Credit florum
By admin
Give a thumbs up
Credit florum
By admin
Give a thumbs up
Photo Courtesy of Shikoku Garden Inc.
By Joy
Give a thumbs up

Comments:
Posted by eclayne (Pioneer Valley south, MA, USA - Zone 6a) on Feb 3, 2012 3:03 PM

The Yellow Flag Iris is a native of Europe, northwestern Asia and northern Africa. A wetland Iris, pseudacorus propagates aggressively by both rhizomes and prolific self seeding.

Per the USDA Plants Database, Noxious Weed Information:
Connecticut: Invasive, banned
Massachusetts: Prohibited
Montana: Category 3 noxious weed
New Hampshire: Prohibited invasive Species
Oregon: "B" designated weed, Quarantine
Washington: Class C noxious weed

Additional invasive resources listing I. pseudacorus include “The Invasive Plant Atlas of the United States” http://www.invasiveplantatlas.... and “Invasive Plants of the U.S.” http://www.invasive.org/weedcd...

Numerous sterile cultivars and hybrids of I. pseudacorus, notably the Pseudatas (I. pseudacorus x I. ensata), are available today for growing outside its native range.

[ Reply to this comment | Give a thumbs up ]

Posted by Bonehead (Planet Earth - Zone 8b) on Feb 18, 2018 5:50 PM

This is a Class C noxious invasive in the Pacific Northwest. Control is recommended but not required. It may sicken livestock although it is generally avoided by herbivores. It clogs small streams and irrigation systems, displaces native vegetation along streambanks, and reduces habitat for waterfowl and fish. It spreads quickly into large clumps in shallow water. It can be pulled by hand or machine, although some folks react to the resins in the leaves and rhizomes. It is extremely difficult to get all the roots and I have had poor luck trying to clear this thug from my pond (we've dug them up using a backhoe). I have also read that one can persistently cut all leaves and stems below the waterline, but have not tried that method. On the plus side, it is a pretty plant with showy yellow flowers. It is native to Europe, the Mediterranean, North Africa, and Asia Minor.

[ Reply to this comment | Give a thumbs up ]

Plant Events from our members
piksihk On March 2, 2019 Bloomed
piksihk On May 19, 2018 Obtained plant
Clump ftom GMB swap
piksihk On April 5, 2016 Transplanted
HW back fence under azalea
gardengus On May 18, 2016 Bloomed
AndreA33 On June 19, 2015 Obtained plant
From BG
» Post your own event for this plant

Discussion Threads about this plant
Thread Title Last Reply Replies
Very invasive in some areas. by PollyK Oct 3, 2011 9:16 PM 0
Not Acorus calamus by pardalinum May 3, 2015 2:29 PM 2
Need help to identify species (if possible, Binomial name) 8 by NightCrow Jan 15, 2019 1:20 PM 1
Monty's Blue Ridge Gardens by UndyingLight Dec 27, 2019 8:24 AM 723
Please help me identify this... by scattycaz Aug 1, 2017 12:10 AM 12
The quest for answers... NOIDS 2017 by Henhouse Jun 21, 2017 8:19 AM 95
Help identifying Iris species by poisondartfrog May 1, 2017 4:02 AM 7
experience with Iris versicolor Dark Aura by Cinta Apr 1, 2017 12:12 PM 11
Bloom Season 2017 by shizen Mar 29, 2018 1:09 PM 3,789
Iris of the day by gemini_sage Aug 14, 2019 4:31 AM 1,488
Starting Japanese iris seeds - Help! by Lestv Apr 4, 2017 9:28 AM 27
Maryland Enacts Bans/Restrictions on Invasive Species by RickM Sep 13, 2016 11:57 AM 2

« Add a new plant to the database

» Search the Irises Database: by characteristics or by cultivar name

« See the general plant entry for Irises (Iris)

« Visit the Irises forum

« The Irises Database Front Page

« The Plants Database Front Page

Today's site banner is by mmolyson and is called "Moss Phlox Phlox subulata"

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.