Aesculus hippocastanumL.

horse-chestnut

WFO wfo-0000522287 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Aesculus hippocastanum, photographed by Jason Grant
fig. a Jason Grant, CC BY 4.0 / 2022-06-05 / obs. 203585540
Aesculus hippocastanum, photographed by Thierry Helminger
fig. b Thierry Helminger, CC BY 4.0 / obs. 205112771
Aesculus hippocastanum, photographed by Jason Grant
fig. c Jason Grant, CC BY 4.0 / obs. 203875681
Aesculus hippocastanum, photographed by Pavel Kacl
fig. d Pavel Kacl, CC BY 4.0 / obs. 203127746
Aesculus hippocastanum, photographed by Yann Kemper
fig. e Yann Kemper, CC0 1.0 / obs. 204135585
Aesculus hippocastanum, photographed by Alexis Tinker-Tsavalas
fig. f Alexis Tinker-Tsavalas, CC BY 4.0 / obs. 203152215
Aesculus hippocastanum, photographed by Jens-Christian Svenning
fig. g Jens-Christian Svenning, CC BY 4.0 / obs. 202798303
Aesculus hippocastanum, photographed by Yann Kemper
fig. h Yann Kemper, CC0 1.0 / obs. 202656931

Every figure is a research-grade observation under CC0, CC BY or CC BY-SA, rehosted with the photographer’s name, the licence and the observation it came from. Photographs under a NonCommercial licence are excluded from this site and are never stored, which costs us a great many pictures and is not negotiable.

Flowering n = 2,666 observations

Peak flowering in May, from 2,666 community-annotated observations worldwide. This is a global aggregate, not a forecast for your garden: the same species flowers on different dates in different hemispheres, and citizen-science records cluster near cities, at weekends, and in spring. Where a species has fewer than 30 annotated records we do not draw this chart at all.

Also published as 17 synonyms

A synonym is not an error. It is a record of botanists disagreeing, in print, about where this plant belongs. Each of these was somebody’s considered answer.

  • Aesculus asplenifolia Loudon
  • Aesculus castanea Gilib.
  • Aesculus hippocastanum f. beaumanii (C.K.Schneid.) Dole
  • Aesculus hippocastanum f. pendula (Puvill.) Rehder
  • Aesculus hippocastanum var. argenteovariegata Loudon
  • Aesculus hippocastanum var. aureovariegata Loudon
  • Aesculus hippocastanum var. beaumanii C.K.Schneid.
  • Aesculus hippocastanum var. flore-pleno Loudon
  • Aesculus hippocastanum var. incisa Booth ex Loudon
  • Aesculus hippocastanum var. pendula Puvill.
  • Aesculus hippocastanum var. variegata Loudon
  • Aesculus memmingeri K.Koch
  • Aesculus procera Salisb.
  • Aesculus septenata Stokes
  • Hippocastanum aesculus Cav.
  • Hippocastanum vulgare Gaertn.
  • Pawia hippocastanum (L.) Kuntze

Sourcesevery claim on this page

  1. World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
  2. iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.

We publish what we can source and we say so when we cannot. This page has no care advice, no toxicity claim and no native range, because we do not yet have those from a source we can cite.