Autumn Squill (Prospero autumnale)

Autumn Squill

Prospero autumnale

Delicate star-shaped blooms carpet autumn grass, a quiet late-season delight. Bulbous perennial herb; common name: Autumn Squill.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; thrives in open grassy areas with unobstructed morning sunlight, tolerates light dappled shade
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Watering Water moderately during active growth phases; allow the top 2–3 cm of soil to dry between waterings to prevent bulb rot
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Temperature Hardy to -10°C; tolerates cool autumn temperatures, avoid prolonged exposure to temperatures exceeding 28°C during dormancy
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Characteristics

  • Leaf: Narrow linear basal leaves emerge post-flowering, dark green and grass-like
  • Flower: Pale pink to white star-shaped blooms in loose racemes, six tepals per flower
  • Bulb: Small ovoid underground bulb with papery outer tunic
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Care Guide

Watering

Keep soil slightly moist during leaf growth in early spring; avoid overwatering to prevent bulb rot

Fertilization

Apply a diluted balanced liquid fertilizer once when leaves emerge. Avoid high-nitrogen fertilizers, which can promote excessive leaf growth at the expense of flowering

Eggshell powder topdressing:Crush clean, dried eggshells into a fine powder; sprinkle lightly over the soil surface in early spring to boost soil calcium levels and improve drainage, avoiding direct contact with bulbs
Pruning
  • Remove spent flower stalks after blooming to prevent unwanted self-seeding
  • Trim yellowing foliage once it dies back naturally in late winter to maintain tidy growth
  • Divide overcrowded bulb clumps in early spring to promote healthy flowering and reduce competition
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; contains cardiac glycosides, which can cause vomiting, diarrhea, lethargy, and irregular heart rate

Humans: Contains cardiac glycosides; ingestion may cause gastrointestinal distress, dizziness, and cardiac arrhythmias in severe cases

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental ground cover for rock gardens, wildflower meadows, and grassy borders