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■(TB) 'Thaïs'

1926, Cayeux

'Thaïs' (Ferdinand Cayeux, 1926) TB. Midseason bloom. Color Class R1M. Cayeux et Le Clerc 1926.

See below:
IMG 7258.jpgthais01.JPGThais02.JPEGthais02.JPGthais03.JPGThais04.JPGthais04.JPGthais040.JPGthais1.jpgthais2.jpgthais5.jpgthais jb.jpgthaisAA.jpgThaisBHI.jpgThaisBHI1.JPGthaisSG.jpg


Revue Horticole, 1924, nouvelle série, Tome XIX, p. 143.
Bulletin de la Société Nationale d'Horticulture de France, 1934, 6e série, Tome I, p. 138.
From Quality Gardens catalog 1931: THAIS (Ta-ees‘) (Cayeux 1926) M. 42". An ideal, large, perfectly formed flow'er on stately, free growing strong stems, carrying four to five flowers open at a time. A self color, of pale lilac pink; a lighter clearer pink than Susan Bliss. Well rounded falls lighted with golden beard. One of the hardiest, most satisfactory iris we know and the best pink for the money. C. of M. S.X.H.F. S3.25.
See John C. Wister Collection, Scott Arboretum Archives, Friends Historical Library of Swarthmore College: picture.
From Robert Wayman's catalog for 1940: "Early. Very sweet fragrance. Huge flowers of perfect form in a most unusual and attractive pink tone. one of the most gorgeous of our pink toned Irises which makes a marvelous garden mass."


Quick Summary of Cultural Directions

Hardiness Zones 4-8 for most varieties, Some cultivars tolerate colder, others tolerate warmer zones (please comment in comment box with your location if this cultivar grows well in zone 3, 4, 9, or 10.)
Exposure Prefers full sun for optimal performance, may still bloom in half-day shade
Water: Prefers well drained good garden soil, Tolerant of dry conditions in established plants, Intolerant of swampy conditions.
PH Prefers Neutral to basic solis 6.1 to 8.5, quite toleranr of more extreme conditions
Fertilizer Prefers rich conditions on relatively inorganic soils.

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Your Observations Are Valued. Please make note of bud count, branching, purple based foliage and bloom time, etc. Because these are affected by climate, note date, year and geographic location and write these and other comments in the comment box below.

Interested in French irises ? Please visit: France Iris | Société Française des Iris et plantes Bulbeuses (french language).


-- LaurieFrazer - 2010-01-17
  • While the beautiful flower style of Thaïs is older, more historic, there are several other strengths this plant also shows, growing in the gardens of the Pacific Northwest. The foliage is one of the cleanest, and most spot-resistant, among bearded class irises growing in Vancouver, Washington and Portland, Oregon gardens. When not in bloom, and up until buds emerge from spathes, Thais is hard to tell from forms of I. pallida. The spathes are papery, often before buds emerge.
    There is virtually no side branching on the stems. Flowers below the terminal point are usually very close to the primary stem.
    Thais' bud count and duration of bloom are consistently excellent for this Portland gardener. Stems often give twelve or more buds, even where there is less than a full day of direct sun. Bloom sequence is good too, with flowers often drying and dropping before younger buds emerge.
    Pod and pollen fertility, so far difficult to gauge. Planted two pods hand-pollinated and harvested in 2011, but saw no germination. Have several pods just picked this 2012 season, and again seeds appear full and sound. In seven to eight months' time should see whether any of these germinate. Also plan to plant seeds of which Thais is the pollen parent, and will be noting germination rates with these also.
    As of December 2014, Ted of GPIS has four seedlings of Thais planted near Sherwood Oregon on a small open hilltop in loamy soil. Unfortunately I, Ted am unsure of the pollen parent, but most likely this is Thais x self or Thais x TB Alcazar. Thais over past four years has set pods moderately following hand pollination, but only about one in six pods gives any seed which look viable. Most seed are underdeveloped, small and shriveled. Observe that TB Thais appears much closer in leaf color and geometry, stem branching and spathe characteristics of iris pallida than to hybrid tall bearded iris varieties.-- TedHavelka - 2014-12-05
Topic attachments
I Attachment Action Size Date Who Comment
IMG_7258.jpgjpg IMG_7258.jpg manage 324 K 20 Dec 2018 - 22:25 Main.davepote photo by David Potembski, Presby 2016
Thais02.JPEGJPEG Thais02.JPEG manage 21 K 10 May 2014 - 12:45 Main.TLaurin Photo courtesy of Mike Lowe from original HIPS website
Thais04.JPGJPG Thais04.JPG manage 108 K 09 Dec 2016 - 15:43 Main.TLaurin Photo by Judy Schneider-The Shady Spot
ThaisBHI.jpgjpg ThaisBHI.jpg manage 76 K 24 Nov 2011 - 00:19 Main.Betsy881 Photo by Mary Hess-Bluebird Haven Iris Garden
ThaisBHI1.JPGJPG ThaisBHI1.JPG manage 77 K 02 Sep 2021 - 10:44 Main.TLaurin Photo by Mary Hess-Bluebird Haven Iris Garden
thais01.JPGJPG thais01.JPG manage 102 K 24 Jun 2020 - 11:16 Main.TLaurin Photo by Nancy McDonald-The Pickle Barrel Collection.
thais02.JPGJPG thais02.JPG manage 136 K 24 Jun 2020 - 11:16 Main.TLaurin Photo by Nancy McDonald-The Pickle Barrel Collection.
thais03.JPGJPG thais03.JPG manage 244 K 24 Jun 2020 - 11:17 Main.TLaurin Photo by Nancy McDonald-The Pickle Barrel Collection.
thais04.JPGJPG thais04.JPG manage 156 K 15 Dec 2021 - 01:42 Main.TLaurin Photo by Nancy McDonald-The Pickle Barrel Collection.
thais040.JPGJPG thais040.JPG manage 171 K 15 Dec 2021 - 01:42 Main.TLaurin Photo by Nancy McDonald-The Pickle Barrel Collection.
thais1.jpgjpg thais1.jpg manage 28 K 11 Jul 2010 - 19:45 Main.mikeu Thais by Mike Unser
thais2.jpgjpg thais2.jpg manage 23 K 11 Jul 2010 - 19:44 Main.mikeu Thais by Mike Unser
thais5.jpgjpg thais5.jpg manage 71 K 17 Jan 2010 - 22:26 Main.htb ©2006 Laurie Frazer
thaisAA.jpgjpg thaisAA.jpg manage 16 K 20 Feb 2011 - 14:30 Main.Betsy881 Photo by Argyle Acres
thaisSG.jpgjpg thaisSG.jpg manage 16 K 01 Jul 2012 - 20:27 Main.Betsy881 Photo by Seagate Irises-United Kingdom
thais_jb.jpgjpg thais_jb.jpg manage 71 K 30 Oct 2013 - 01:00 Main.Harloiris photo Delane Langton, AIS Dallas 2013
Topic revision: r40 - 19 Nov 2022, af.83
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