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Aesculus hippocastanum
Also called White Horse Chestnut, European horsechestnut, Buckeye, Spanish chestnut, Common horse chestnut, Conker tree, European horse chestnut
A large deciduous tree grown widely in streets and parks across temperate regions, prized for its spring flower spikes and conkers. It is not the edible sweet chestnut, and its seeds, leaves and bark are poisonous.
Aesculus hippocastanum, the horse chestnut, is a species of flowering plant in the maple, soapberry and lychee family Sapindaceae. It is a large, deciduous, synoecious (hermaphroditic-flowered) tree. It is also called horse-chestnut, European horsechestnut, buckeye, and conker tree. It is not to be confused with the sweet chestnut or Spanish chestnut, Castanea sativa, which is a tree in another family, Fagaceae.
It is widely cultivated in streets and parks throughout the temperate world, and has been particularly successful in places like Ireland, Great Britain and New Zealand, where it is commonly found in parks, streets and avenues. Cultivation for its spectacular spring flowers is successful in a wide range of temperate climatic conditions provided summers are not too hot, with trees being grown as far north as Edmonton, Alberta, Canada, the Faroe Islands, Reykjavík, Iceland and Harstad, Norway.
The horse-chestnut is a favorite subject for bonsai.
Raw horse chestnut seed, leaf, bark and flower are toxic due to the presence of aesculin and should not be ingested. Horse chestnut seed is classified by the US Food and Drug Administration as an unsafe herb. The glycoside and saponin constituents are considered toxic.
The seeds, especially those that are young and fresh, are slightly poisonous, containing alkaloid saponins and glucosides. Although not dangerous to touch, they cause sickness when eaten; consumed by horses, they can cause tremors and lack of coordination.
The native distribution of Aesculus hippocastanum given by different sources varies. As of March 2023, Plants of the World Online considered it to be native to the Balkans (Albania, Bulgaria, Greece and former Yugoslavia), but also to Turkey and Turkmenistan. A 2017 assessment for the IUCN Red List restricted the native distribution to the Balkan area: Albania, Bulgaria, mainland Greece and North Macedonia. It has been introduced and planted around the world. It can be found in many parts of Europe as far north as Harstad north of the Arctic Circle in Norway, and Gästrikland in Sweden as well as in many parks and cities around the northern United States and Canada such as Edmonton in Alberta.
Prior to the advent of mechanical refrigeration, German beer brewers would dig cellars for lagering and plant horse chestnut trees to further protect them from the summer heat due to their dense canopies and shallow roots. The practice of serving beer at these sites evolved into the modern beer garden.
California buckeye · Yellow buckeye · Ohio buckeye · Indian Horse Chestnut · Bottlebrush Buckeye · Red buckeye · Buckeyes & Horse-chestnuts
Text excerpted from the Wikipedia article Aesculus hippocastanum by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
Pet safety from the ASPCA toxic and non-toxic plant lists.
