Known as- Tall bearded iris
Grow Zone - 3 to 10
Type- Herbaceous perennial
Smith Scl. hardy? No
ht.- 2.5 to 3 ft.
Span- 1 to 2 ft.
Shade/Light- Full sun
Moisture- Medium dampure
Hi/Lo Maint- Medium
Best grown in humusy, moderate wet, well-drained soils in full sun. Best
flowering and disease resistance occur in full sun. Good soil drainage
is essential to combat potential soft rot problems. Avoid use of mulch
for the same reason. Heavy clay soils such as those present in much of
the St. Louis area must be amended prior to planting (e.g., add gypsum,
coarse sand, organic matter) or raised plantings should be considered.
Plant rhizomes shallowly (cover with 1/2’ soil) and 12-24’
apart in mid to late summer (July to early September). Fertilize lightly
in early spring. Deadhead individual spent flowers and remove flowering
stems to the ground after bloom. Divide plants when overcrowding occurs
(every 3-4 years).
“Midnight Fragrance” is a tall bearded iris which typically
grows to 36’ tall and slowly spreads by rhizomes. As the cultivar
name suggests, blooms are sweetly fragrant. Standards and falls are dark
violet black and ruffled. Blooms in spring. Sword-shaped, linear leaves.
C. Hahn 1989.
The major insect pest of bearded iris is iris borer. Major disease problems
are bacterial soft rot and fungal leaf spot. Good sanitation practices
are the most important component of any disease/insect control program-
promptly remove and destroy diseased foliage/rhizomes, promptly remove
and destroy borer-infected foliage/rhizomes and perform an annual clean-up
of all debris and foliage from beds in fall after frost. The most frequent
causes of failure to flower or sparse flowering are (1) rhizomes are planted
too deep, (2) plants are located in too much shade, (3) plants were given
too much fertilizer or (4) plants have become overcrowded and need division.
Shade/Lightny beds and borders.