Small Fennel Flower (Nigella nigellastrum)

Small Fennel Flower

Nigella nigellastrum

Delicate blue blooms nestle in feathery bracts, a dainty garden gem. Annual flowering herb; common name: Small Fennel Flower.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; tolerates mild afternoon shade in hot, arid regions
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Watering Water thoroughly when the top 2 cm of soil feels dry; avoid overwatering to prevent root rot
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Temperature Thrives in cool temperate to warm conditions; avoid prolonged exposure to temperatures above 30°C
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Characteristics

  • Leaf: Finely dissected, feathery bright green foliage resembling fennel
  • Flower: Star-shaped pale blue to lavender blooms surrounded by lacy, thread-like bracts
  • Fruit: Oval, inflated seed capsules with prominent, raised ridges
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Care Guide

Watering

Keep soil consistently moist but not waterlogged

Fertilization

Light application of balanced organic feed at planting. Over-fertilization can reduce flower production

Eggshell powder topdressing:Sprinkle a thin layer of crushed, dried eggshells on the soil surface; avoid direct contact with plant stems to prevent fungal growth
Pruning
  • Deadhead spent blooms regularly to encourage extended flowering
  • Remove yellowing or damaged foliage to maintain a tidy appearance
  • Cut back entire plant after seed collection to clear garden beds for subsequent plantings
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats

Humans: Non-toxic; seeds are sometimes used in small culinary quantities

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental garden plant; seeds sometimes used as a culinary spice or for craft purposes