Translate this page:

Summary

Physical Characteristics

Conium is a BIENNIAL growing to 2 m (6ft) by 1 m (3ft 3in).
See above for USDA hardiness. It is hardy to UK zone 5 and is not frost tender. It is in flower from June to July. The species is hermaphrodite (has both male and female organs) and is pollinated by Insects. The plant is self-fertile.
Suitable for: light (sandy), medium (loamy) and heavy (clay) soils. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It prefers moist soil.

UK Hardiness Map US Hardiness Map

Synonyms

Plant Habitats

Edible Uses

Leaves - cooked[105]. Although toxic, plants found in the south of England are comparatively harmless and the leaves are used as a pot-herb[2]. They can also be dried for later use. The toxic principle is said to be destroyed by thorough cooking or drying[4, 100]. Caution is advised, especially on the remarks about plants in southern England[K]. See the notes above on toxicity.

References More on Edible Uses

Medicinal Uses

Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.

Hemlock is a very poisonous plant that has a long history of medicinal use, though it is very rarely used in modern herbalism[238, 254]. It is a narcotic plant that sedates and relieves pain[238]. The plant contains coniine, an extremely toxic substance that can also cause congenital defects[254]. The whole plant is analgesic, antispasmodic, emetic, galactofuge and sedative[4, 7, 9, 21, 213, 222]. It is a traditional folk treatment for cancer[222] and was formerly widely used internally in very small doses to treat a variety of complaints including tumours, epilepsy, whooping cough, rabies and as an antidote to strychnine poisoning[232, 254]. It is still used externally, usually in ointments and oils, in the treatment of mastitis, malignant tumours (especially breast cancer) anal fissure and haemorrhoids[238]. The leaves and stems should be harvested when the first fruits are forming, since they are then at their most active medicinally[4]. The fruits are gathered either when fully ripe, or before they turn from green to yellow, and are then dried[4]. Because of the extremely toxic nature of this herb, it is seldom employed nowadays[232]. Use with extreme caution and only under the guidance of a qualified practitioner[21, 238]. See also the notes above on toxicity. A homeopathic remedy is prepared from a tincture of the fresh plant, harvested when in flower[232]. It is used for treating complaints such as dizziness, coughs, insomnia, exhaustion[232], arteriosclerosis and prostate problems[7].

References More on Medicinal Uses

The Bookshop: Edible Plant Books

Our Latest books on Perennial Plants For Food Forests and Permaculture Gardens in paperback or digital formats.

Edible Tropical Plants

Food Forest Plants for Hotter Conditions: 250+ Plants For Tropical Food Forests & Permaculture Gardens.

Edible Temperate Plants

Plants for Your Food Forest: 500 Plants for Temperate Food Forests & Permaculture Gardens.

PFAF have eight books available in paperback and digital media.

More Books

PFAF have eight books available in paperback and digital formats. Browse the shop for more information.

Shop Now

Other Uses

None known

Special Uses

References More on Other Uses

Cultivation details

A fairly common weed in Britain, it succeeds in most soils in sun or light shade and avoids acid soils in the wild. It prefers a damp rich soil[238]. This is the plant that Socrates is said to have used to kill himself, though this is probably an error[207]. It requires a large dose if it is to be lethal (this contradicts with the notes above on toxicity[K]), and death from this plant can be very painful whilst Socrates is said to have died without pain[207]. Another report says that poisonous doses cause paralysis, which starts at the feet and moves up the body. There is no pain, the mind remains clear and lucid until death, which is caused by asphyxia when paralysis reaches the chest[232]. The whole plant has a foetid smell[7].

References Carbon Farming Information and Carbon Sequestration Information

Temperature Converter

Type a value in the Celsius field to convert the value to Fahrenheit:

Celsius Fahrenheit:

The PFAF Bookshop

Plants For A Future have a number of books available in paperback and digital form. Book titles include Edible Plants, Edible Perennials, Edible Trees,Edible Shrubs, Woodland Gardening, and Temperate Food Forest Plants. Our new book is Food Forest Plants For Hotter Conditions (Tropical and Sub-Tropical).

Shop Now

Plant Propagation

Seed - best sown in situ as soon as it is ripe in the late summer. It usually germinates in the autumn.

Other Names

If available other names are mentioned here

beaver poison; carrot-fern; fool's-parsley; hemlock; herb bennet; kecksies; kex; musquash root; poison parsley; spotted corobane; spotted-hemlock; spotted-parsley. Spanish: encaje cimarrón; panalillo; perejil de chucho; perejil de monte; zanahoria silvestre. French: cigue maculee; cigue tache; cigue tachetee; grande ciguë Chinese: du shen. Brazil: cicuta; funcho-selvagem. Germany: Gefleckter Schierling. Guatemala: perejil de chucho; perejil de monte. Italy: cicuta maggiore. Netherlands: gevlekte scheerling. Sweden: odört.

Native Plant Search

Search over 900 plants ideal for food forests and permaculture gardens. Filter to search native plants to your area. The plants selected are the plants in our book 'Plants For Your Food Forest: 500 Plants for Temperate Food Forests and Permaculture Gardens, as well as plants chosen for our forthcoming related books for Tropical/Hot Wet Climates and Mediterranean/Hot Dry Climates. Native Plant Search

Found In

Countries where the plant has been found are listed here if the information is available

Native in temperate regions of Europe, West Asia, and North Africa. Introduced and naturalised in Asia, North America, Australia, and New Zealand.

Weed Potential

Right plant wrong place. We are currently updating this section. Please note that a plant may be invasive in one area but may not in your area so itâ€™s worth checking.

This plant can be weedy or invasive. Considered an invasive species in 12 U.S. states. Competes with pasture and crops and encroaches on native vegetation, while posing a serious health hazard to virtually all livestock, and humans.

Conservation Status

IUCN Red List of Threatened Plants Status : This taxon has not yet been assessed.

Related Plants

Latin Name	Common Name	Habit	Height	Hardiness	Growth	Soil	Shade	Moisture	Edible	Medicinal	Other
Conium maculatum	Hemlock, Poison hemlock	Biennial	2.0	4-8		LMH	SN	M	1	2	0

Growth: S = slow M = medium F = fast. Soil: L = light (sandy) M = medium H = heavy (clay). pH: A = acid N = neutral B = basic (alkaline). Shade: F = full shade S = semi-shade N = no shade. Moisture: D = dry M = Moist We = wet Wa = water.

Conium - L.