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IRIS 'Istanbul'

Image of Iris 'Istanbul'

Jesse Saylor

Family

Iridaceae

Botanical Name

IRIS 'Istanbul'

Plant Common Name

Istanbul Iris, Tall Bearded Iris

Special Notice

This entry has yet to be reviewed and approved by L2G editors.

General Description

From a distance, the ruffled flowers of the Istanbul bearded iris simply look yellow, white and rust. Only with closer inspection do subtle color changes and intricate streaking patterns come to light. Blooming most heavily in early to mid-spring, this hybrid selection reblooms again in very early autumn before fall frosts force this perennial into its annual winter dormancy. 'Istanbul' was developed by Monty Byers and released in 1990.

The distinctively shaped flowers of bearded iris appear on tall, strong stems emerging from fans of light to medium green, sword-shaped foliage. The stems branch and carry numerous plump flower buds. Each blossom comprises three upright petals called “standards” and three drooping tepals (petal-like sepals) referred to as “falls.” Fuzzy golden yellow pads called “beards” are located at the base or shoulder of the falls. On 'Istanbul', the standards are clear yellow but he white falls are edged in red-violet blush and leopard-like stripes. These sweetly musk-scented blooms are pollinated by bees and make striking cut flowers, with each blossom lasting one to three days before shriveling up.

Bearded irises are tough, adaptable perennials which prosper in full sun to light shade and fertile, well-drained soils. Plant them with the tops of their slowly spreading, fleshy rhizomes exposed to the air. In hot summer climates, dappled shade in the afternoon is recommended. After three to five years, lift and divide the rhizomes and replant in late summer if the plants become too large or crowded. These rewarding, long-lived irises deserve a prominent spot in the mixed flower border or foundation bed.

Characteristics

  • AHS Heat Zone

    9 - 1

  • USDA Hardiness Zone

    3 - 9

  • Sunset Zone

    1a, 1b, 2a, 2b, 3a, 3b, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24

  • Plant Type

    Perennial

  • Sun Exposure

    Full Sun, Partial Sun

  • Height

    18"-34" / 45.7cm - 86.4cm

  • Width

    16"-24" / 40.6cm - 61.0cm

  • Bloom Time

    Spring, Early Fall

  • Native To

    Hybrid Origin

Growing Conditions

  • Soil pH

    Acidic, Neutral, Alkaline

  • Soil Drainage

    Well Drained

  • Soil type

    Clay, Loam, Sand

  • Growth Rate

    Medium

  • Water Requirements

    Average Water

  • Habit

    Clump-Forming

  • Seasonal Interest

    Spring, Fall

Ornamental Features

  • Flower Interest

    Showy

  • Flower Color

    White, Yellow, Blue

  • Flower Color Modifier

    Multi-Color

  • Foliage Color (Spring)

    Blue Green

  • Foliage Color (Summer)

    Blue Green

  • Foliage Color (Fall)

    Blue Green

  • Fragrant Flowers

    Yes

  • Fragrant Fruit

    No

  • Fragrant Foliage

    No

  • Bark or Stem Fragrant

    No

  • Flower Petal Number

    Single

  • Repeat Bloomer

    Yes

  • Showy Fruit

    No

  • Edible Fruit

    No

  • Showy Foliage

    No

  • Foliage Texture

    Medium

  • Foliage Sheen

    Matte

  • Evergreen

    No

  • Showy Bark

    No

Special Characteristics

  • Usage

    Cutflower, Foundation, Mixed Border, Rock Garden / Wall

  • Sharp or Has Thorns

    No

  • Invasive

    No

  • Self-Sowing

    No