• Photo of Iris pseudacorus (Iris pseudacoruss)

Plant Profile: Iris pseudacorus

Taxonomy: Iris pseudacorus

Names

Yellow Flag, Yellow Flag Iris

  • Photo of Iris pseudacorus (Iris pseudacoruss)

Phonetic Spelling:

Genus:Iris

Species:pseudacorus

Family:Iridaceae

The Yellow Flag Iris is a hardy perennial bulb that thrives in wet conditions and is originally from Eurasia and Africa. It showcases vibrant yellow flowers that flourish best in moist soils, capable of growing in water up to 10 inches deep or in the saturated mud along pond edges. The striking iris-like blooms typically emerge between April and June, while the foliage features sword-shaped leaves that can reach lengths of up to 36 inches. This plant propagates through rhizomes and seeds, which can lead to it rapidly dominating native flora in wet environments.

While it prefers wet habitats, the Yellow Flag Iris can also adapt to slightly drier conditions in gardens that are moist to wet. It is best planted in full sunlight, particularly in boggy areas or along the edges of ponds. Caution is advised to prevent this species from spreading into natural ecosystems, and it is recommended to consider native alternatives.

In terms of pests and diseases, the Yellow Flag Iris does not face significant issues. However, it is advisable not to plant it near natural waterways, as it has the potential to become invasive and overly abundant.

Iris pseudacorus Feature Summary

Iris pseudacorus Image Gallery

Tags

#showy flowers
#water garden
#easy to grow
#yellow flowers
#weedy
#mass planting
#wet sites
#pond margins
#rhizomes
#wet soils tolerant
#HS302
#problem for cats
#problem for dogs
#problem for horses
#bog gardens
#meadows

Similar Plants

Iris pseudacorus Feature Summary

Attributes
The rhizome has been used in herbal medicine. The plant also has the ability to take up heavy metals out of water.
Europe, north Africa, western Asia
It has naturalized in much of the USA
Perennial
Fruit
The fruit is a dry 3-sided capsule 1.5–3 in long, containing numerous pale brown seeds.
Flowers
3-4 inch yellow iris-type flowers with several flowers per stem April to June
Gold/Yellow
Spring
Summer
3-6 inches
Leaves
Erect sword-shaped leaves are up to 35 inches long and 1.2 inches wide. Parallel venation and smooth margins
> 6 inches
1-3 inches
Stem
The flowering stalk is stout and glabrous
Smooth (glabrous)
Poisonous to Humans
Salivation, vomiting, drooling, lethargy, diarrhea. Highest concentration in rhizomes
Pentacylic terpenoids (zeorin, missourin and missouriensin)
Whole Plant Traits
Herbaceous Perennial
Water Plant
Clumping
Cultural Conditions
Acid (<6.0)
Neutral (6.0-8.0)
Occasionally Wet
Frequent Standing Water
Occasional Flooding
Coastal
Mountains
Piedmont
Landscape
Cutting Garden
Water Garden
Border
Mass Planting
Problem for Cats
Problem for Dogs
Problem for Horses
Weedy

Iris pseudacorus Attributes

Iris pseudacorus: Uses (Ethnobotany)

The rhizome has been used in herbal medicine. The plant also has the ability to take up heavy metals out of water.

Iris pseudacorus: Country Or Region Of Origin

Europe, north Africa, western Asia

Iris pseudacorus: Distribution

It has naturalized in much of the USA

Iris pseudacorus: Life Cycle

Annual
Biennial
Bulb
Perennial
Woody

Iris pseudacorus Fruit

Iris pseudacorus: Fruit Description

The fruit is a dry 3-sided capsule 1.5–3 in long, containing numerous pale brown seeds.

Iris pseudacorus: Fruit Type

Achene
Aggregate
Berry
Capsule
Caryopsis
Drupe
Follicle
Legume
Nut
Pome
Samara
Schizocarp
Siliqua

Iris pseudacorus: Fruit Value To Gardener

Edible
Fragrant
Good Cut
Good Dried
Long Bloom Season
Long-lasting
Showy

Iris pseudacorus Flowers

Iris pseudacorus: Flower Description

3-4 inch yellow iris-type flowers with several flowers per stem April to June

Iris pseudacorus: Flower Color

filter_vintage
Gold/Yellow

Iris pseudacorus: Flower Inflorescence

Catkin
Corymb
Cyme
Head
Insignificant
Panicle
Raceme
Solitary
Spadix
Spike
Umbel

Iris pseudacorus: Flower Value To Gardener

Edible
Fragrant
Good Cut
Good Dried
Long Bloom Season
Long-lasting
Showy

Iris pseudacorus: Flower Bloom Time

Winter
Spring
Summer
Fall

Iris pseudacorus: Flower Size

1-3 inches
3-6 inches
< 1 inch
> 6 inches

Iris pseudacorus Leaves

Iris pseudacorus: Leaf Description

Erect sword-shaped leaves are up to 35 inches long and 1.2 inches wide. Parallel venation and smooth margins

Iris pseudacorus: Leaf Color

spa
Green

Iris pseudacorus: Leaf Type

Compound (Pinnately , Bipinnately, Palmately)
Fronds
Needles
Sheath
Simple

Iris pseudacorus: Leaf Arrangement

Alternate
Opposite
Other/more complex
Rosulate
Whorled

Iris pseudacorus: Leaf Shape

Acicular
Auriculate
Cordate
Cuneate
Deltoid
Elliptical
Filiform
Lanceolate
Linear
Oblanceolate
Oblong
Obovate
Obtuse
Orbicular
Ovate
Palmasect
Palmatifid
Peltate
Pinnatifid
Pinnatisect
Reniform
Rhomboidal
Spatulate
Subcordate
Subulate

Iris pseudacorus: Leaf Margin

Crenate
Crenulate
Dentate
Denticulate
Doubly Crenate
Doubly Dentate
Doubly Serrate
Entire
Lobed
Serrate
Sinuate
Undulate

Iris pseudacorus: Hairs Present

No
Yes

Iris pseudacorus: Leaf Length

< 1 inch
1-3 inches
3-6 inches
> 6 inches

Iris pseudacorus: Leaf Width

< 1 inch
1-3 inches
3-6 inches
> 6 inches

Iris pseudacorus Stem

Iris pseudacorus: Stem Description

The flowering stalk is stout and glabrous

Iris pseudacorus: Stem Color

grass
Green

Iris pseudacorus: Stem Is Aromatic

No
Yes

Iris pseudacorus: Stem Surface

Corky Ridges
Covered with a powdery bloom (glaucous)
Dull
Hairy (pubescent)
Polished
Smooth (glabrous)

Iris pseudacorus Poisonous to Humans

Iris pseudacorus: Poison Symptoms

Salivation, vomiting, drooling, lethargy, diarrhea. Highest concentration in rhizomes

Iris pseudacorus: Poison Toxic Principle

Pentacylic terpenoids (zeorin, missourin and missouriensin)

Iris pseudacorus: Poison Severity

High
Low
Medium

Iris pseudacorus: Causes Contact Dermatitis

No
Yes

Iris pseudacorus Whole Plant Traits

Iris pseudacorus: Plant Type

Annual
Bulb
Carnivorous
Edible
Epiphyte
Fern
Ground Cover
Herb
Herbaceous Perennial
Houseplant
Mushroom
Native Plant
Ornamental Grasses and Sedges
Perennial
Poisonous
Rose
Shrub
Succulent
Tree
Turfgrass
Vegetable
Vine
Water Plant
Weed
Wildflower

Iris pseudacorus: Habit/Form

Arching
Ascending
Broad
Cascading
Climbing
Clumping
Columnar
Conical
Creeping
Dense
Erect
Horizontal
Irregular
Mounding
Multi-stemmed
Multi-trunked
Open
Oval
Prostrate
Pyramidal
Rounded
Spreading
Vase
Weeping

Iris pseudacorus: Growth Rate

Slow
Medium
Rapid

Iris pseudacorus: Maintenance

Low
Medium
High

Iris pseudacorus Cultural Conditions

Iris pseudacorus: Soil pH

Acid (<6.0)
Alkaline (>8.0)
Neutral (6.0-8.0)

Iris pseudacorus: Soil Drainage

Frequent Standing Water
Good Drainage
Moist
Occasional Flooding
Occasionally Dry
Occasionally Wet
Very Dry

Iris pseudacorus: NC Region

Coastal
Mountains
Piedmont

Iris pseudacorus: USDA Plant Hardiness Zone

thermostat
5a
thermostat
5b
thermostat
6a
thermostat
6b
thermostat
7a
thermostat
7b
thermostat
9a
thermostat
9b

Iris pseudacorus Landscape

Iris pseudacorus: Landscape Theme

Asian Garden
Butterfly Garden
Children's Garden
Cottage Garden
Cutting Garden
Drought Tolerant Garden
Edible Garden
English Garden
Fairy Garden
Garden for the Blind
Native Garden
Nighttime Garden
Pollinator Garden
Rain Garden
Rock Garden
Shade Garden
Water Garden
Winter Garden

Iris pseudacorus: Design Feature

Accent
Barrier
Border
Flowering Tree
Foundation Planting
Hedge
Mass Planting
Screen/Privacy
Security
Shade Tree
Small groups
Small Tree
Specimen
Street Tree
Understory Tree

Iris pseudacorus: Resistance To Challenges

Black Walnut
Compaction
Deer
Diseases
Drought
Dry Soil
Erosion
Fire
Foot Traffic
Heat
Heavy Shade
Humidity
Insect Pests
Pollution
Poor Soil
Rabbits
Salt
Slugs
Squirrels
Storm damage
Urban Conditions
Voles
Wet Soil
Wind

Iris pseudacorus: Landscape Location

Coastal
Container
Hanging Baskets
Houseplants
Lawn
Meadow
Naturalized Area
Near Septic
Patio
Pond
Pool/Hardscape
Recreational Play Area
Riparian
Rock Wall
Slope/Bank
Small Space
Vertical Spaces
Walkways
Woodland

Iris pseudacorus: Problems

Allelopathic
Contact Dermatitis
Frequent Disease Problems
Frequent Insect Problems
Invasive Species
Malodorous
Messy
Poisonous to Humans
Problem for Cats
Problem for Children
Problem for Dogs
Problem for Horses
Short-lived
Spines/Thorns
Weak Wood
Weedy