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■(TB) 'Threshold'

1968, Hamblen

'Threshold' (Melba Hamblen, R. 1967). Seedling# H63-86A. TB, 34" (86 cm). Early bloom. Color Class VB5Fcm, Lobelia blue (RHS violet-blue 91B) self with lighter center area in falls; red-orange beard. Seedling# 60-141 (('Fashion Show' x 'Mary Randall' x 'Pink Enchantment')) x ('Melodrama' x seedling# 60-48 (tangerine bearded blue involving 'Palomino', 'Helen McGregor', 'Hit Parade', 'Radiation','Great Lakes') X (('Valimar' sib x'June's Sister') x 'Fifth Avenue')). Mission Bell 1968. High Commendation 1967; Honorable Mention 1972.

See below:


From AIS Bulletin #189 April 1968 Introducing THRESHOLD (Hamblen). EM. 34". Gracefully ruffled, wide petaled, lilting lobelia blue-violet with a complimentary red-orange beard accentuated by a lighter area of color in the fall center. Full domed standards; arched flaring falls. Smooth finish. Fine branching and bud count. From involved "pink x blue" breeding; complete pedigree will be in our catalog. Sdlg. H63-86A. HC '67. Net $25.00. Mission Bell.
THRESHOLD (Hamblen '68). Lovely light blue-violet self with light orange beard. Its large blossoms and sturdy tall well-branched stalks mark it as an improvement on 'RIPPLING WATERS' if it proves to be consistent. [Sexton, Don (1972). Varietal Comments, American Iris Society Bulletin 204(January 1972), 25.]


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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-- Main.RPries - 2011-03-07
I Attachment Action Size Date Who Comment
ThresholdBHI.jpgjpg ThresholdBHI.jpg manage 66 K 23 Nov 2011 - 21:37 Main.Betsy881 Photo by Mary Hess-Bluebird Haven Iris Garden
threshold02.JPGJPG threshold02.JPG manage 956 K 23 Jun 2017 - 14:17 Main.TLaurin Photo scanned from the Glenn Corlew slide collection
Topic revision: r11 - 16 Nov 2023, Harloiris
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