Many plants in this genus are thought to be poisonous if ingested, so caution is advised
. The roots are especially likely to be toxic
Plants can cause skin irritations and allergies in some people
There are no edible uses listed for Iris douglasiana.
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
. It would take a person almost 6 weeks to make a rope 3.5 metres long
. The fibre can also be used for making paper
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
Plants can be grown for ground cover when spaced about 60cm apart each way
There are no medicinal uses listed for Iris douglasiana.
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
. 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
. Another report says that it succeeds in sun or shade in acid or slightly alkaline soils
. Requires a moist soil, growing well by water
. This species requires a really well-drained soil, dry rather than damp
. It succeeds in dry shade according to another report which also says that it is drought tolerant once established
. Easily grown in semi-shade in a woodland soil
. Tolerates salt spray
Plants are hardy to about -15°c.
A very ornamental plant, it hybridizes readily, especially with other Pacific coast Irises.
Members of this genus are rarely if ever troubled by browsing deer or rabbits.
Resents root disturbance, any moving of the plant is best done in early September
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.
This table shows all the data stored for this plant.
Material uses & Functions
- Strong wind
- Maritime exposure
Native Climate Zones
Adapted Climate Zones
Native Geographical Range
Root Zone Tendancy
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