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Dietes grandiflora, commonly known as the Fortnight Lily, Large Wild Iris, or Fairy Iris, is an exceptionally hardy, clumping evergreen perennial native to South Africa. Belonging to the Iridaceae (iris) family, it is highly celebrated in landscaping for its structural, sword-like foliage and striking, low-maintenance blooms. The common name "Fortnight Lily" comes from its unique flowering habit, where blooms frequently erupt in bursts at roughly two-week intervals throughout the warmer months.
Light requirement: Full sun to partial shade.
Water requirement: Low to moderate overall water requirements.
Watering frequency: Regular during establishment; reduce once established. However, giving it regular water during dry periods will yield a much higher volume of blooms
Soil: Moist, rich, and well-drained soil. Dietes grandiflora is highly celebrated for being "virtually indestructible" because it adapts easily to almost any soil type.
Skill level: Beginner
Growth rate: Moderate to fast.
Suitable for container gardens: Yes.
Mature Height: 60–12cm
Mature Width: Spreads 60–90cm
Seasonality: Evergreen
Drought Tolerant: Once established, it possesses exceptional drought tolerance.
Frost Tolerant: Tolerates light frost.
Wind Tolerant: Highly wind tolerant.
Leaf colour: Dark green
Leaf Variegation pattern: No
Size of leaf: Up to 1m long & 15-20mm wide. Forms dense, upright, fan-shaped clumps of d rigid, strap-like leaves.
Flower Colour: Pristine white iris-like blossoms. Each bloom features distinct yellow spots on the outer petals and a pale violet or mauve centre.
Flower Shape: Large, 10cm orchid-like shape.
Flower Fragrance: Lightly fragrant
Flower Season: Spring/ Summer. The individual flowers of Dietes grandiflora typically persist for 3 to 5 days.
Dietes grandiflora, commonly known as the Fortnight Lily, Large Wild Iris, or Fairy Iris, is an exceptionally hardy, clumping evergreen perennial native to South Africa. Belonging to the Iridaceae (iris) family, it is highly celebrated in landscaping for its structural, sword-like foliage and striking, low-maintenance blooms. The common name "Fortnight Lily" comes from its unique flowering habit, where blooms frequently erupt in bursts at roughly two-week intervals throughout the warmer months.
Light requirement: Full sun to partial shade.
Water requirement: Low to moderate overall water requirements.
Watering frequency: Regular during establishment; reduce once established. However, giving it regular water during dry periods will yield a much higher volume of blooms
Soil: Moist, rich, and well-drained soil. Dietes grandiflora is highly celebrated for being "virtually indestructible" because it adapts easily to almost any soil type.
Skill level: Beginner
Growth rate: Moderate to fast.
Suitable for container gardens: Yes.
Mature Height: 60–12cm
Mature Width: Spreads 60–90cm
Seasonality: Evergreen
Drought Tolerant: Once established, it possesses exceptional drought tolerance.
Frost Tolerant: Tolerates light frost.
Wind Tolerant: Highly wind tolerant.
Leaf colour: Dark green
Leaf Variegation pattern: No
Size of leaf: Up to 1m long & 15-20mm wide. Forms dense, upright, fan-shaped clumps of d rigid, strap-like leaves.
Flower Colour: Pristine white iris-like blossoms. Each bloom features distinct yellow spots on the outer petals and a pale violet or mauve centre.
Flower Shape: Large, 10cm orchid-like shape.
Flower Fragrance: Lightly fragrant
Flower Season: Spring/ Summer. The individual flowers of Dietes grandiflora typically persist for 3 to 5 days.