Data specific to Irises (Edit)
Classification: Species
Bloom Color Classification: Violet

General Plant Information (Edit)
Life cycle: Perennial
Sun Requirements: Full Sun to Partial Shade
Water Preferences: Mesic
Dry Mesic
Fruiting Time: Summer
Flowers: Showy
Flower Time: Spring
Late spring or early summer
Underground structures: Rhizome
Uses: Will Naturalize
Resistances: Drought tolerant
Propagation: Seeds: Self fertile
Pollinators: Various insects

Common names
  • Species Iris
  • Toughleaf Iris
  • Oregon Iris
  • Oregon Flag
  • Iris
Botanical names
  • Accepted: Iris tenax
  • Synonym: Iris tenax subsp. klamathensis

Photo Gallery
Location: Washington 8b
Date: 2022-05-31
Uploaded by robertduval14
Location: My Garden, Utah
Date: 2016-05-09
Location: Chehalis, WA, 
Date: April 2018
Iris tenax (Toughleaf Iris, Oregon Flag, Oregon Iris)
Location: Del Norte county, Ca. amongst the Redwoods
Date: 2011-05-28
Location: by road
Date: 20240510
Location: north bed
Date: 20240510
Location: No.Calif amongst the Redwoods
Date: 2011-05-25
wild bloom

Photo courtesy of Singing Tree Gardens Nursery
  • Uploaded by Joy

Photo courtesy of Singing Tree Gardens Nursery
  • Uploaded by Joy
Location: Near Newport, Oregon
Date: May 26, 2011 8:21 AM
Location: WA, Seattle area
Date: 2015-05-09
Location: Washington Park, Portland, Oregon
Photo courtesy of David W. Barts, wikimedia Commons

Date: c. 1924
illustration from 'The Handbook of Garden Irises' by Dykes, 1924
  • Posted by Bonehead (Planet Earth - Zone 8b) on Mar 1, 2019 9:31 AM concerning plant:
    Native in the Pacific NW, west of the Cascades from Washington to California. Found in open fields and at forest edges. Forms large clumps from slender rhizomes. Flowers are usually a shade of purple, but occasionally are white or yellow.

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