Autumn crocus (Colchicum autumnale)

Autumn crocus

Colchicum autumnale

It blooms in autumn without leaves—a beautiful but deadly goblet of pale purple. Herbaceous perennial; other names: meadow saffron, naked ladies.

Prefers partial sun to full sun; requires sunlight during its spring vegetative phase to store energy.
1/week
Easy
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Plant Needs

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Sunlight Prefers partial sun to full sun; requires sunlight during its spring vegetative phase to store energy.
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Watering Moderate moisture during spring growth and autumn blooming; requires dry conditions during summer dormancy.
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Temperature Highly cold-hardy; thrives in temperate climates with distinct seasons.
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Characteristics

  • Leaves: Basal, lanceolate to strap-shaped, dark green, up to 25 cm long; they emerge in spring and die back completely by summer before the flowers appear;
  • Flowers: Goblet-shaped, pale purple to pinkish-lilac, featuring 6 tepals and 6 stamens (distinguishing it from true crocuses which have 3 stamens), emerging directly from the ground in autumn;
  • Underground: Fleshy corms, 3-5 cm in diameter, covered with a dark brown, leathery tunic;
  • Fruit: A three-valved capsule that matures in spring alongside the foliage, containing numerous small, dark seeds.
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Care Guide

Watering

Water moderately in spring while leaves are green; cease watering entirely in summer when dormant.

Fertilization

Apply a light top dressing of organic compost or mild DIY fertilizer when leaves emerge.. Requires minimal feeding; over-fertilization can encourage rot.

Banana Peel Tea:Steep chopped banana peels in water for 24-48 hours. Dilute 1:1 with water and apply to the soil around the emerging spring foliage to support corm development. Discard peels in compost to avoid attracting pests.
Pruning
  • Foliage: Never cut back the green spring leaves; allow them to yellow and die back naturally by early summer to ensure the corm stores enough energy for autumn blooms;
  • Flowers: Spent autumn flowers can be left to decompose naturally or gently removed for aesthetic purposes;
  • Handling: Always wear gloves when handling corms, leaves, or flowers due to the high toxicity of the plant sap.
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: Highly toxic per ASPCA; ingestion of any part, especially the corm, can cause severe systemic poisoning and death.

Humans: Highly toxic; contains colchicine which inhibits cell division. Ingestion can be fatal and causes severe multi-organ failure.

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Garden Uses & Culture

Culture: In Western classical antiquity, the plant's name derives from Colchis, a region on the Black Sea coast associated in Greek mythology with the sorceress Medea, famous for her knowledge of deadly poisons.

Usage: Cultivated as an ornamental garden plant for late-season color. Commercially grown for the extraction of colchicine, a medication used to treat gout and familial Mediterranean fever, and used in agriculture to induce polyploidy in plant breeding.