Plants
Autumn Crocus
Colchicum autumnale · Colchicaceae
The autumn crocus is one of the most idiosyncratic bulb flowers: its crocus-like, rosy-violet blooms emerge naked from the ground in autumn — entirely without leaves, which only follow the next spring. As beautiful as this late bloomer is, it has to be said plainly: the entire plant is highly poisonous. Know this and place it wisely, and you gain an enchanting splash of colour for the October garden.
- Light
- Sunny to partially shaded; ideal in fresh meadows and along woodland edges.
- Watering
- Fresh soil preferred; water additionally only during autumn dry spells.
- Care level
- Easy
- Botanical
- Colchicum autumnale
German folk speech calls it the „naked maiden“ because the flowers appear without any foliage. Its rhythm runs backwards: flowering in September and October, leaves and seed capsules in spring, summer dormancy underground. Anyone seeing the broad, tulip-like foliage in May rarely suspects it belongs to an autumn flower.
Despite its English and German nicknames, the autumn crocus is no crocus at all: it belongs to the Colchicaceae and has six stamens, while true crocuses have only three. That distinction is more than botanical trivia — it is a safety matter, because while crocuses are only moderately toxic, the autumn crocus can be lethal.
Its poison is colchicine, a cell toxin present in all parts of the plant that is not broken down by drying or cooking. Most poisoning cases occur in spring when the leaves are mistaken for wild garlic. Hence our clear recommendation: no autumn crocuses in gardens where children play, dogs dig or wild garlic grows.
In the right place, however, it is completely undemanding: a sunny to part-shaded, fresh meadow or woodland edge, with the corms planted about ten centimetres deep in July and August. There it naturalises for decades and flowers reliably just as the garden grows tired.
Culturally the plant is remarkable: colchicine has been used against gout since antiquity and remains a medicinal substance today — in plant breeding it also serves to create new cultivars. An example of how close poison and medicine can be; in lay hands, though, the plant has no place as a remedy.
Is Autumn Crocus toxic to children and pets?
- Children
- Highly toxic
- Cats
- Highly toxic
- Dogs
- Highly toxic
The autumn crocus is one of the most poisonous plants in Central Europe. All parts contain colchicine; just a few grams of leaves or seeds can be fatal to children and pets. The greatest danger is mistaking the spring leaves for wild garlic. If ingestion is suspected, call poison control or a vet immediately — do not wait.
Typical symptoms: Only after hours: burning in the mouth, nausea, violent vomiting and watery to bloody diarrhoea, circulatory failure; the delay makes the poisoning especially treacherous.
In an emergency:call the German poison control centre in Bonn on +49 228 19240 (24/7) — for pets, contact an emergency vet directly. This information does not replace medical or veterinary advice.
Overview: toxic & non-toxic plants for cats, dogs and children
Care
- 01Choose a sunny to part-shaded spot with fresh, nutrient-rich soil.
- 02Plant corms in July or August about ten centimetres deep — always with gloves.
- 03Water occasionally during autumn flowering if conditions are dry.
- 04Let the spring foliage die back completely; it feeds the corm.
- 05Never use meadows containing autumn crocus for hay or animal fodder.
- 06Mark the spot clearly and keep it well away from wild garlic patches.
Frequently asked
- How poisonous is the autumn crocus really?
- Very. The colchicine it contains is a cell toxin with no antidote; for a child, a few grams of plant material can already be life-threatening, and the plant is highly dangerous to dogs, cats and grazing animals too. With any suspicion: call poison control or a vet immediately.
- How do you tell autumn crocus from wild garlic?
- The safest test is the smell: wild garlic clearly smells of garlic when rubbed, autumn crocus leaves do not. Wild garlic leaves are also soft, stalked and single, while autumn crocus leaves are firm, unstalked and clustered around one shoot. When in doubt: leave it be.
- Why does the autumn crocus flower without leaves?
- That is its survival strategy: the corm stores energy through its foliage in spring, rests over summer and sends up only the flower in autumn, when there is hardly any competition left in the meadow. Seed ripening then follows with the new foliage the next spring.
- Is the autumn crocus a true crocus?
- No. Despite similar flowers it belongs to its own family, the Colchicaceae. The difference shows in its six stamens — crocuses have three. There are also true autumn-flowering crocuses, which are far less dangerous.