How to Grow Fortnight Lily
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Fortnight Lily
Moraea sisyrinchium
flowerFortnight Lily is a delicate, iris-like perennial native to South Africa, characterized by slender, grass-like foliage and small, intricate yellow flowers with distinctive brown or purple markings. The plant earned its common name from its tendency to produce flowers repeatedly throughout the growing season, approximately every two weeks. It is prized by gardeners for its elegant blooms and ability to naturalize in suitable climates.
When should you plant Fortnight Lily in your zone?
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Example Fortnight Lily timeline · Pittsburgh, PA (Zone 6b)
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Plant Fortnight Lily
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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First Fortnight Lily blooms
Mid-to-late summerBefore the first fall frost (≈ Nov 8)
Sample dates for Pittsburgh, PA. Sign up to get exact Fortnight Lily dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 8b-11; requires frost protection or container cultivation in cooler regions
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Get my Fortnight Lily timeline →Growth Stages
Dormancy/Emergence
2-3 monthsCorms remain dormant underground during cold months; new shoots emerge in spring as temperatures warm
Plant corms in fall in warm climates or early spring in cooler regions. Ensure soil dries slightly between waterings during this period.
Vegetative Growth
4-8 weeksThin, wiry, grass-like foliage develops, reaching 12-18 inches tall with minimal branching
Maintain consistent moisture without waterlogging. Fertilize lightly with balanced fertilizer every 4-6 weeks. Remove any dead foliage.
Flowering
3-6 months (intermittent blooms spring through fall)Delicate, 1-1.5 inch flowers emerge on thin stems, typically yellow with brown, purple, or red markings and distinctive central patterns
Flowers last 1-2 days individually but repeat every 1-2 weeks throughout the season. Deadhead spent flowers to encourage continuous blooming. Provide stakes for support in windy locations.
Seed Development & Dormancy
2-3 monthsSeed pods develop after flowering; foliage gradually yellows and dies back as plants enter dormancy
Allow some flowers to set seed for naturalization if desired, or deadhead to direct energy back to corms. Reduce watering as foliage dies back. Do not cut back foliage until completely brown.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Increase humidity through regular misting; spray with neem oil or insecticidal soap if infestation occurs
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Remove affected flowers; use yellow sticky traps; spray with insecticidal soap if severe
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Ensure excellent drainage; avoid overwatering; improve air circulation; use well-draining soil amendments
Uses
Ornamental edible flowers
CulinaryMoraea sisyrinchium flowers are occasionally used as delicate garnishes in gourmet cuisine and are edible, though primarily valued for their visual appeal. [source]
Cut flowers and floral arrangements
CraftThe elegant, intricate blooms are prized for use in fresh flower arrangements, corsages, and fine floral design due to their unique coloring and delicate appearance. [source]
Garden ornamental and naturalizing
HouseholdFortnight Lily is used in Mediterranean, xeriscaping, and cottage garden designs, where it naturalizes readily and provides long-season color with minimal maintenance. [source]
Pollinator attraction
WildlifeThe flowers attract bees, butterflies, and other pollinators throughout the extended blooming season, making it valuable in wildlife and butterfly gardens. [source]
Traditional African herbal use
MedicinalIn its native South Africa, Moraea species have been used traditionally in herbal preparations, though clinical research is limited and use should be approached cautiously. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Fortnight Lilies are ornamental flowers; cut blooms in early morning for fresh arrangements. Flowers are delicate and last 1-2 days in water. Allow some flowers to mature into seed pods if you wish to collect seeds for propagation or naturalization.
Fun Facts
- 🌱 The common name 'Fortnight Lily' derives from the plant's remarkable habit of producing new flowers approximately every two weeks during the growing season, providing nearly continuous blooms for months.
- 🌱 Moraea sisyrinchium is native to the fynbos vegetation of South Africa and is adapted to poor, sandy soils and Mediterranean-like climates, making it exceptionally drought-tolerant once established.
- 🌱 The intricate flower markings serve as 'nectar guides' for pollinators, directing insects to the flower's reproductive center—a common strategy in the Iridaceae family.
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