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Yellow Wild Iris
Dietes bicolor
SA tree number
English: Yellow Wild Iris, Peacock Flower, African Iris, Fortnight Lily
Afrikaans: Uintjie, Geel Wilde-Iris, Poublom
Misapplied or old scientific names: Moraea bicolor, Iris bicolor
Dietes bicolor, commonly known as Yellow Wild Iris or Fortnight Lily, is a truly elegant perennial plant that grows in neat, fan-like clumps of strap-shaped leaves. It's famous for its stunning, iris-like flowers that are a beautiful pale yellow with distinctive dark brown or black spots on their inner petals. These flowers pop open for just a day, but the plant produces them in such quick succession that it seems to be in bloom almost continuously, especially during the warmer months!
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Distinguishing features:
Grows in dense, fan-like clumps.
Leaves are long, stiff, and strap-shaped.
Flowers are pale yellow with three prominent, dark brown or black spots at the base of the inner petals.
Flowers are iris-like and short-lived (lasting one day).
Produces flowers over a very long period, especially in warmer months.
Overall appearance:
Dietes bicolor is a beautiful evergreen perennial that forms attractive, upright clumps of sword-like leaves. Its main appeal lies in its delicate, pale yellow, iris-like flowers, which are adorned with striking dark spots and are produced almost continuously.
Height:
Up to 1.5 m.
Leaves:
Long, stiff, and strap-shaped.
Arranged in a fan-like manner.
Up to 1.5 m long.
Flowers:
Pale yellow to cream.
Three petals with a dark brown or black spot at the base of each inner petal, sometimes with orange markings.
Iris-like in shape.
Only last for one day but are produced in quick succession.
Borne on long, slender stalks that often fork.
Flowering season:
Peak flowering in spring and early summer (September to February), but often flowers year-round in frost-free areas if sufficient water is available.
Fruits:
A brown, woody capsule.
About 20 mm long.
Contains flattened, dark brown seeds.
Seeds:
Flattened.
Dark brown.
Produced in abundance.
Can be collected when the capsule turns brown.
Sow seeds in spring.
Roots:
Thick, underground rhizomes (stem-like roots) from which the leaves grow.
Soil type:
Prefers well-drained, compost-enriched soil. Can tolerate a wide range of soil conditions, including clay.
Aspect:
Thrives in full sun or semi-shade. Tolerates coastal conditions.
Uses:
Landscaping: Excellent for mass planting as a groundcover, along banks and slopes, or as an accent plant. It's often used in large public gardens and commercial plantings due to its hardiness and attractive appearance.
Borders: Ideal for planting in large groups in mixed borders.
Water features: Suitable for planting next to ponds or streams.
Erosion control: Good for stabilising banks.
Attracts wildlife: Its flowers are pollinated by insects, and it can attract bees and other beneficial insects to the garden.
Ecology:
Pollination: Flowers are pollinated by insects, including bees.
Habitat: Found in coastal areas.
Hardiness: Drought-resistant and can tolerate light frost, but prefers moist, warm conditions for optimal growth and flowering.
Distribution and habitat:
Endemic to the Eastern Cape province of South Africa.
Found in coastal areas.
Derivation of name:
The genus name Dietes comes from the Greek words 'di' meaning 'two' and 'etes' meaning 'affinities', referring to the close relationship between this genus and both Moraea and Iris.
The species name bicolor is Latin, meaning 'two-coloured', referring to the yellow petals and the prominent dark spots on the inner petals.
The common name 'Fortnight Lily' is a bit misleading, as the individual flowers only last a day, but new ones open every day, giving the impression of continuous flowering.
Interesting facts:
Even though it's called "Fortnight Lily," each individual flower of Dietes bicolor only lasts for one day! But don't worry, the plant is so keen to show off that it produces new flowers almost every single day, making it look like it's blooming for weeks on end. It's a real overachiever!
Those dark brown or black spots on its inner petals are like unique little beauty marks, making each yellow flower instantly recognisable.
This plant is a true Eastern Cape original, found naturally only in that part of South Africa – a real local superstar!
While it loves a good drink, this Yellow Wild Iris is also pretty tough and can handle dry spells, making it a great choice for water-wise gardens.
Growing tips:
Planting location: Plant Dietes bicolor in full sun or semi-shade. It's very versatile and can be used for mass planting, along borders, or even next to water features.
Soil and watering: It prefers well-drained soil enriched with compost but is adaptable to various soil types, including clay. Water regularly, especially in summer, to encourage continuous flowering. It can tolerate drought but will look better with consistent moisture.
Frost: It can tolerate light frost, but in very cold areas, some protection or mulching might be beneficial.
Maintenance: Remove spent flower stalks to keep the plant tidy and encourage more blooms. Divide congested clumps every few years, preferably in spring, to revitalise the plant and create new ones.
Propagation: Easily propagated from seeds or by dividing the rhizomes (underground stems) in spring. Seeds: Sow seeds in spring. Division: Simply dig up a clump, separate it into smaller sections, ensuring each section has some roots and leaves, and replant.
This plant is a fantastic alternative for:
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