How to Grow Autumn Crocus
Colchicum autumnale
Colchicum produces goblet-shaped pink-purple flowers in autumn without any foliage — the leaves appear separately in spring. Plant corms in late summer (July-August) in well-drained soil in sun or partial shade. They naturalise beautifully in grass or under deciduous trees. All parts are highly toxic — wear gloves when handling.
Yearly Lifecycle
Care Essentials
Feed in early spring as leaves emerge with a general-purpose fertilizer. The spring foliage is building energy for autumn flowers.
Watch For
- Slugs on autumn flowers
- Grey mould (Botrytis) in wet autumns
- Narcissus bulb fly
Track your Autumn Crocus care schedule — pruning, feeding, and seasonal tasks
Start planning freeCare Requirements
☀️ Light
Full sun to partial shade
Full sun to partial shade. Naturalises beautifully under deciduous trees, which allow winter and autumn sun through.
💧 Watering
Minimal once established; excellent drainage essential
Minimal once established. Colchicum is drought-tolerant in summer dormancy. Good drainage is essential — avoid waterlogged soil at all times.
🌱 Fertilizing
Single balanced feed in early spring
Apply a balanced general-purpose fertiliser in early spring as the leaves emerge. This is the only window to feed the corm.
✂️ Pruning
Never cut spring foliage until fully yellowed
Never cut the spring foliage until it has completely yellowed (usually June). Remove spent flowers only if unsightly.
❄️ Overwintering
Fully hardy; corms stay in ground year-round
Fully hardy throughout the UK. Corms remain in the ground year-round with no protection needed. Do not lift unless dividing.
Growing Tips
Let spring foliage die back naturally
Never cut the strap-like spring leaves before they have completely yellowed and collapsed — usually by June. The foliage is the only time the corm photosynthesises to build reserves for autumn flowers. Removing it early weakens the corm and reduces or eliminates flowering.
Plant in late summer — do not delay
Plant corms in July or August, before flowers emerge. Corms deteriorate rapidly out of the ground, so plant immediately on purchase. Set them 10 cm deep and 15 cm apart in well-drained soil.
Highly toxic — handle with care
All parts of colchicum contain colchicine and are highly poisonous to humans, dogs, cats, and horses. Always wear gloves when handling corms. Keep away from children and pets. Despite the common name Autumn Crocus, it is not related to true crocuses.
Naturalise in grass or under deciduous trees
Colchicum looks beautiful naturalised in short grass or under the canopy of deciduous trees, which are bare when the flowers appear in autumn. Mow around the clumps in spring while the foliage is present, not after — let the leaves die back first.
Pests & Diseases
Pest Slugs
Identification: Slugs damage or devour the delicate autumn flowers, which emerge close to the ground.
- Apply organic slug pellets (ferric phosphate) around clumps before flowering begins in September.
- Use copper tape around clumps.
- Ferric phosphate pellets.
Pest Narcissus Bulb Fly
Identification: Larvae of Merodon equestris tunnel into corms and destroy them. Affected corms feel hollow or soft.
- Dig up and destroy affected corms.
- Cover emerging foliage with fine mesh in spring to prevent egg-laying.
- No chemical control available to home gardeners.
Disease Grey Mould (Botrytis) Botrytis cinerea
Symptoms: Grey fuzzy mould on flowers and stems in wet autumns.
Treatment: Remove affected tissue promptly.
Prevention: Improve air circulation and avoid wetting the flowers when watering nearby plants.
Disease Corm Rot Fusarium spp.
Symptoms: Failure to flower and soft, smelly corms caused by waterlogged or poorly drained soil.
Treatment: Dig up and discard rotted corms.
Prevention: Always plant in well-drained soil; on heavy clay, add grit or raise the bed.
Log Autumn Crocus in your garden — track growth, care, and harvests year after year
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