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Toxic parts

Many plants in this genus are thought to be poisonous if ingested, so caution is advised[1]. The roots are especially likely to be toxic[2]. Plants can cause skin irritations and allergies in some people[2].

Edible uses

There are no edible uses listed for Iris douglasiana.

Material uses

A fibre is obtained from the leaves. Traditionally the N. American Indians would take just the one outside fibre from each side of a leaf. This must have necessitated using a huge number of leaves. It makes a beautifully strong and pliable cord or rope[3][4]. It would take a person almost 6 weeks to make a rope 3.5 metres long[4]. The fibre can also be used for making paper[5] The leaves are harvested in summer after the plant has flowered, they are scraped to remove the outer skin and are then soaked in water for 2 hours prior to cooking. The fibres are cooked for 24 hours with lye and then beaten in a ball mill for 3 hours. They make a light tan paper[5]. Plants can be grown for ground cover when spaced about 60cm apart each way[6].

Unknown part

Medicinal uses(Warning!)

There are no medicinal uses listed for Iris douglasiana.


Ecosystem niche/layer

Soil surface

Ecological Functions

Ground cover


Nothing listed.


Nothing listed.


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 late summer[7]. 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.

Practical Plants is currently lacking information on propagation instructions of Iris douglasiana. Help us fill in the blanks! Edit this page to add your knowledge.


We have found this species to be exceedingly easy to grow in sun or shade in our medium loamy soil that is slightly acid. It does well in very wet as well as very dry years. It has withstood considerable neglect, forming a very dense clump that seems capable of standing up to grass and other vigorous plants[K]. The following notes, however, suggest a wide difference of opinions over the best conditions for this plant[K]. Requires a rich well-drained lime-free soil[7][8][9]. Another report says that it succeeds in sun or shade in acid or slightly alkaline soils[10]. Requires a moist soil, growing well by water[11]. This species requires a really well-drained soil, dry rather than damp[12]. It succeeds in dry shade according to another report which also says that it is drought tolerant once established[13]. Easily grown in semi-shade in a woodland soil[7]. Tolerates salt spray[10].

Plants are hardy to about -15°c[14]. A very ornamental plant[11], it hybridizes readily, especially with other Pacific coast Irises[10]. Members of this genus are rarely if ever troubled by browsing deer or rabbits[12].

Resents root disturbance, any moving of the plant is best done in early September[10].


Problems, pests & diseases

Associations & Interactions

There are no interactions listed for Iris douglasiana. Do you know of an interaction that should be listed here? edit this page to add it.

Polycultures & Guilds

There are no polycultures listed which include Iris douglasiana.




None listed.


None listed.

Full Data

This table shows all the data stored for this plant.

Binomial name
Iris douglasiana
Imported References
Edible uses
Medicinal uses
Material uses & Functions
Edible uses
None listed.
Material uses
None listed.
Medicinal uses
None listed.
Functions & Nature
Provides forage for
Provides shelter for
Hardiness Zone
Heat Zone
full sun
light shade
Soil PH
Soil Texture
Soil Water Retention
Environmental Tolerances
  • Drought
  • Strong wind
  • Maritime exposure
Native Climate Zones
None listed.
Adapted Climate Zones
None listed.
Native Geographical Range
None listed.
Native Environment
None listed.
Ecosystem Niche
Root Zone Tendancy
None listed.
Deciduous or Evergreen
Herbaceous or Woody
Life Cycle
Growth Rate
Mature Size
Flower Colour
Flower Type

"image:DouglasIris.jpg|248px" cannot be used as a page name in this wiki. "image:DouglasIris.jpg|248px" cannot be used as a page name in this wiki. "image:DouglasIris.jpg|248px" cannot be used as a page name in this wiki.

"image:DouglasIris.jpg|248px" cannot be used as a page name in this wiki. "image:DouglasIris.jpg|248px" cannot be used as a page name in this wiki.

"image:DouglasIris.jpg|248px" cannot be used as a page name in this wiki.

"image:DouglasIris.jpg|248px" cannot be used as a page name in this wiki., "image:DouglasIris.jpg|248px" cannot be used as a page name in this wiki., "image:DouglasIris.jpg|248px" cannot be used as a page name in this wiki. "image:DouglasIris.jpg|248px" cannot be used as a page name in this wiki., "image:DouglasIris.jpg|248px" cannot be used as a page name in this wiki.

"image:DouglasIris.jpg|248px" cannot be used as a page name in this wiki."image:DouglasIris.jpg|248px" cannot be used as a page name in this wiki."image:DouglasIris.jpg|248px" cannot be used as a page name in this wiki."image:DouglasIris.jpg|248px" cannot be used as a page name in this wiki.


  1. ? Frohne. D. and Pf?nder. J. A Colour Atlas of Poisonous Plants. Wolfe ISBN 0723408394 (1984-00-00)
  2. ? 2.02.1 Bown. D. Encyclopaedia of Herbs and their Uses. Dorling Kindersley, London. ISBN 0-7513-020-31 (1995-00-00)
  3. ? 3.03.1 Balls. E. K. Early Uses of Californian Plants. University of California Press ISBN 0-520-00072-2 (1975-00-00)
  4. ? Coffey. T. The History and Folklore of North American Wild Flowers. Facts on File. ISBN 0-8160-2624-6 (1993-00-00)
  5. ? Bell. L. A. Plant Fibres for Papermaking. Liliaceae Press (1988-00-00)
  6. ? 6.06.1 Thomas. G. S. Plants for Ground Cover J. M. Dent & Sons ISBN 0-460-12609-1 (1990-00-00)
  7. ? Grey. C. H. Hardy Bulbs. Williams & Norgate. (1938-00-00)
  8. ? 8.08.1 Munz. A California Flora. University of California Press (1959-00-00)
  9. ? Innes. C. The World of Iridaceae ()
  10. ? ? Alpine Garden Society Bulletin. Volume 56. Alpine Garden Society ()
  11. ? 11.011.1 F. Chittendon. RHS Dictionary of Plants plus Supplement. 1956 Oxford University Press (1951-00-00)
  12. ? 12.012.1 Thomas. G. S. Perennial Garden Plants J. M. Dent & Sons, London. ISBN 0 460 86048 8 (1990-00-00)
  13. ? Chatto. B. The Dry Garden. Dent ISBN 0460045512 (1982-00-00)
  14. ? Phillips. R. & Rix. M. Perennials Volumes 1 and 2. Pan Books ISBN 0-330-30936-9 (1991-00-00)
  15. ? Huxley. A. The New RHS Dictionary of Gardening. 1992. MacMillan Press ISBN 0-333-47494-5 (1992-00-00)

"image:DouglasIris.jpg|248px" cannot be used as a page name in this wiki.

Facts about "Iris douglasiana"RDF feed
Article is incompleteYes +
Article requires citationsNo +
Article requires cleanupYes +
Belongs to familyIridaceae +
Belongs to genusIris +
Functions asGround cover +
Has binomial nameIris douglasiana +
Has drought toleranceTolerant +
Has environmental toleranceMaritime exposure +, High wind + and Drought +
Has fertility typeSelf fertile + and Insects +
Has flowers of typeHermaphrodite +
Has hardiness zone7 +
Has imageDouglasIris.jpg +
Has lifecycle typePerennial +
Has material partUnknown part +
Has material useFibre + and Paper +
Has mature height0.3 +
Has mature width0.6 +
Has primary imageDouglasIris.jpg +
Has search nameiris douglasiana +
Has shade toleranceLight shade +
Has soil ph preferenceAcid +, Neutral + and Alkaline +
Has soil texture preferenceSandy + and Loamy +
Has sun preferenceFull sun +
Has taxonomic rankSpecies +
Has taxonomy nameIris douglasiana +
Has water requirementshigh +
Inhabits ecosystem nicheSoil surface +
Is deciduous or evergreenEvergreen +
Is taxonomy typeSpecies +
PFAF cultivation notes migratedNo +
PFAF edible use notes migratedYes +
PFAF material use notes migratedNo +
PFAF medicinal use notes migratedYes +
PFAF propagation notes migratedNo +
PFAF toxicity notes migratedNo +
Tolerates maritime exposureYes +
Tolerates nutritionally poor soilNo +
Tolerates windYes +
Uses mature size measurement unitMeters +
Has subobjectThis property is a special property in this wiki.Iris douglasiana + and Iris douglasiana +