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Summary
Physical Characteristics
Iris douglasiana is an evergreen Perennial growing to 0.3 m (1ft) by 0.6 m (2ft in).
See above for USDA hardiness. It is hardy to UK zone 7 and is not frost tender. It is in leaf all year, in flower from May to June, and the seeds ripen from August to September. The species is hermaphrodite (has both male and female organs) and is pollinated by Insects. The plant is self-fertile.
Suitable for: light (sandy) and medium (loamy) soils. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It prefers dry moist or wet soil and can tolerate drought. The plant can tolerate maritime exposure.
UK Hardiness Map
US Hardiness Map
Synonyms
I. beecheyana. I. watsoniana.
Plant Habitats
Woodland Garden Sunny Edge; Dappled Shade; Ground Cover; Bog Garden;
Edible Uses
References More on Edible Uses
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.
None known
References More on Medicinal Uses
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Other Uses
Fibre Paper
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[92, 207]. It would take a person almost 6 weeks to make a rope 3.5 metres long[207]. The fibre can also be used for making paper[189] 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[189]. Plants can be grown for ground cover when spaced about 60cm apart each way[208].
Special Uses
Ground cover
References More on Other Uses
Cultivation details
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[42, 71, 79]. Another report says that it succeeds in sun or shade in acid or slightly alkaline soils[129]. Requires a moist soil, growing well by water[1]. This species requires a really well-drained soil, dry rather than damp[233]. It succeeds in dry shade according to another report which also says that it is drought tolerant once established[190]. Easily grown in semi-shade in a woodland soil[42]. Tolerates salt spray[129]. Plants are hardy to about -15°c[187]. A very variable and ornamental plant[1, 270], it hybridizes readily, especially with other Pacific coast Irises[129]. Iris douglasiana hybridizes with I. bracteata, I. chrysophylla, I. fernaldii, I. hartwegii, I. innominata, I. macrosiphon, I. munzii, I. purdyi, I. tenax, and I. tenuissima[270]. Members of this genus are rarely if ever troubled by browsing deer or rabbits[233]. Resents root disturbance, any moving of the plant is best done in early September[129].
References Carbon Farming Information and Carbon Sequestration Information
Temperature Converter
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Plant Propagation
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[42]. 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
If available other names are mentioned here
Native Range
NORTHERN AMERICA: United States (Oregon, California)
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
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| Latin Name | Common Name | Habit | Height | Hardiness | Growth | Soil | Shade | Moisture | Edible | Medicinal | Other |
| Albizia lebbeck | Siris Tree, Woman's Tongue, East Indian Walnut | Tree | 15.0 |
10-11
| F | LMH | N | M | 1 | 2 | 4 |
| Albizia lucidior | Potka siris tree | Tree | 15.0 |
10-12
| F | LMH | SN | M | 0 | 0 | 3 |
| Albizia procera | White Siris, Tall Albizia, Forest Siris | Tree | 25.0 |
10-12
| F | LMH | N | M | 1 | 2 | 4 |
| Bobartia indica | Rush Iris | Perennial | 0.6 |
7-10
| S | L | N | DM | 0 | 0 | 1 |
| Gynandriris sisyrinchium | Spanish Nut | Perennial | 0.2 |
7-10
| | MH | SN | DM | 1 | 0 | |
| Iris cristata | Crested Iris, Dwarf crested iris | Perennial | 0.2 |
5-9
| M | LM | SN | M | 1 | 1 | |
| Iris decora | | Perennial | 0.3 |
-
| | LM | N | DM | 0 | 1 | |
| Iris ensata | Japanese Water Iris | Perennial | 0.6 |
5-8
| M | LM | N | MWe | 1 | 1 | 2 |
| Iris filifolia | | Bulb | 0.5 |
-
| | LM | N | DM | 1 | 0 | |
| Iris foetidissima | Stinking Gladwin, Stinking iris, Gladwin Iris | Perennial | 1.0 |
7-10
| M | LMH | FSN | DMWe | 0 | 2 | 3 |
| Iris germanica | Purple Flag, German iris, Orris-root, Tall Bearded German Iris, Bearded Iris | Perennial | 1.0 |
4-10
| M | LM | SN | DM | 1 | 3 | 2 |
| Iris germanica florentina | Orris, Orris-root | Perennial | 0.9 |
5-10
| M | LM | SN | M | 1 | 3 | 3 |
| Iris japonica | | Perennial | 0.6 |
-
| | LM | SN | DM | 1 | 2 | 3 |
| Iris kemaonensis | | Perennial | 0.5 |
-
| | LM | SN | DM | 0 | 2 | |
| Iris macrosiphon | Bowltube Iris | Perennial | 0.2 |
-
| | LM | SN | M | 0 | 1 | 1 |
| Iris missouriensis | Rocky Mountain Iris | Perennial | 0.8 |
0-0
| | LM | SN | MWe | 1 | 2 | 1 |
| Iris pallida | Dalmation Iris, Sweet iris, Fragrant Iris, Zebra Iris | Perennial | 1.0 |
4-10
| M | LM | SN | DM | 2 | 1 | 3 |
| Iris pseudacorus | Yellow Flag, Paleyellow iris | Perennial | 1.5 |
5-8
| M | LM | SN | MWeWa | 1 | 2 | 2 |
| Iris purdyi | Purdy's Iris | Perennial | 0.4 |
-
| | LM | SN | DM | 0 | 0 | 1 |
| Iris sanguinea | Blood iris | Perennial | 0.8 |
5-9
| | LM | SN | MWe | 0 | 1 | 1 |
| Iris setosa | Beachhead Iris, Canada beachhead iris, Wild flag | Perennial | 0.6 |
4-8
| M | LM | SN | MWe | 1 | 1 | 1 |
| Iris sibirica | Siberian Iris | Perennial | 0.6 |
4-9
| F | LM | SN | MWe | 1 | 1 | 1 |
| Iris tectorum | Roof Iris, Wall iris, Japanese Roof, White Root Iris | Perennial | 0.3 |
5-9
| M | LM | SN | DM | 1 | 0 | |
| Iris tenax | Tough-Leaf Iris, Klamath iris | Perennial | 0.3 |
0-0
| | LM | SN | DM | 0 | 1 | 2 |
| Iris versicolor | Blue Flag, Harlequin blueflag | Perennial | 0.6 |
4-8
| | LM | SN | MWe | 0 | 3 | 2 |
| Solanum tuberosum | Potato, Irish potato | Perennial | 1.0 |
7-10
| | LMH | N | M | 5 | 2 | 3 |
| Tagetes filifolia | Irish Lace | Annual | 0.4 |
8-11
| | LMH | N | DM | 1 | 0 | 2 |
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Growth: S = slow M = medium F = fast. Soil: L = light (sandy) M = medium H = heavy (clay). pH: A = acid N = neutral B = basic (alkaline). Shade: F = full shade S = semi-shade N = no shade. Moisture: D = dry M = Moist We = wet Wa = water.
Expert comment
Author
Herb.
Botanical References
71200270
Links / References
For a list of references used on this page please go here
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Subject : Iris douglasiana
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