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Sapindaceae FAMILY

Aesculus glabra

Aesculus glabra

Edibility
2/5
Medicinal
2/5

Safety & Hazards

The plant is poisonous, containing the glycoside aesculin, the saponin aescin, and possibly alkaloids. The symptoms include muscle weakness and paralysis, dilated pupils, vomiting, diarrhea, depression, paralysis, and stupor - death has been known to result[1]. The seed is rich in saponins. Although poisonous, saponins also have a range of medicinal applications and many saponin-rich plants are used in herbalism (particularly as emetics, expectorants and febrifuges) or as sources of raw materials for the pharmaceutical industry. Saponins are also found in a number of common foods, such as many beans. Saponins have a quite bitter flavour and are in general poorly absorbed by the human body, so most pass through without harm. They can be removed by carefully leaching in running water. Thorough cooking, and perhaps changing the cooking water once, will also normally remove most of them. However, it is not advisable to eat large quantities of raw foods that contain saponins. Saponins are much more toxic to many cold-blooded creatures, such as fish, and hunting tribes have traditionally put large quantities of them in streams, lakes etc in order to stupefy or kill the fish and make them easy to catch[PFAF].

Cultivation Details

HabitDeciduous Tree
Growth—

Aesculus glabra is found in the continental climate of eastern N. America, where it grows mainly at lower elevations. It is found in areas where the mean annual temperature ranges from about 4 - 10°c; the mean minimum temperatures are not below -29°c, although -40°c has been recorded where it grows in Missouri and Iowa; maximum temperatures as high as 46°c have occurred in the western part of its range. The mean annual precipitation ranges from 760 - 1,400mm, with 510 - 640mm falling in the growing season and snowfall ranging from 5 - 102cm. About 160 days are frost-free in the northern part of the range and as many as 220 days in the southern part[2]. Although the trees are very hardy when dormant, the new growth can be damaged by late spring frosts so the plant does less well in more maritime climates[3]. Succeeds in full sun to partial shade[4]. Prefers a deep loamy, moist but well-drained soil but is not too fussy[5, 3]. This species is the state tree of Ohio[6]. Its growth-rate is moderate in the wild, with trees living up to 100 years[6]. The twigs, bark, flowers and leaves all produce a foetid odour if crushed[6]. Seedlings quickly develop a taproot and larger plants can be difficult to transplant[4]. Plants begin to produce seed when about 8 years old[2]. Only those flowers near the base of the branches of an inflorescence are hermaphrodite and fertile. The others are male and infertile[2].

Propagation

Seed - best sown outdoors or in a cold frame as soon as it is ripe[3, 7]. The seed germinates almost immediately and must be given protection from severe weather[8]. Seedlings develop a large taproot following germination and so, if grown in containers, should be given sufficient root room[2]. The seed has a very limited viability and must not be allowed to dry out. Stored seed should be soaked for 24 hours prior to sowing and even after this may still not be viable[7, 9]. It is best to sow the seed with its 'scar' downwards[8]. If sowing the seed in a cold frame, pot up the seedlings in early spring and plant them out into their permanent positions in the summer. Cite as: Temperate Plants Database, Ken Fern. temperate.theferns.info. 2026-02-20. <temperate.theferns.info/plant/Aesculus+glabra>

Pollinators

Insects

References

  1. [1]Poisonous Plants of North Carolina — http://www.ces.ncsu.edu/depts/hort/consumer/poison/poison.htm ↩︎An excellent concise but comprehensive guide to toxic plants that grow in N. Carolina. It lists even those plants that are of very low toxicity, including several well-known food plants such as carrots and potatoes.
  2. [2]Silvics of North America. Agricultural Handbook No. 654. — Burns. R.M. & Honkala. B.H. · USDA Forest Service; Washington DC. · 1990 · http://www.na.fs.fed.us/spfo/pubs/silvics_manual/table_of_contents.htm ↩︎A very comprehensice guide to about 200 species of timber trees of N. America, Hawaii and Puerto Rico. Mainly temperate species, plus a number of tropical species. It is downloadable from the Internet.
  3. [3]Trees and Shrubs Hardy in Great Britain. Vol 1 - 4 and Supplement. — Bean. W. · Murray · 1981 · ISBN - ↩︎A classic with a wealth of information on the plants, but poor on pictures.
  4. [4]KemperCentreForHomeGardeningPlantFinder — Missouri Botanical Garden · http://www.mobot.org/gardeninghelp/plantfinder/ ↩︎Basic cultivation details, plant uses, habitat etc for several thousand species of plants, mainly from the temperate zone.
  5. [5]RHS Dictionary of Plants plus Supplement. 1956 — F. Chittendon. · Oxford University Press · 1951 · ISBN - ↩︎Comprehensive listing of species and how to grow them. Somewhat outdated, it has been replaced in 1992 by a new dictionary (see [ 200 ]).
  6. [6]The Complete Trees of N. America. Field Guide and Natural History. — Elias. T. · Van Nostrand Reinhold Co. · 1980 · ISBN 0442238622 ↩︎A very good concise guide. Gives habitats, good descriptions, maps showing distribution and a few of the uses. It also includes the many shrubs that occasionally reach tree proportions.
  7. [7]Hardy Woody Plants from Seed. — McMillan-Browse. P. · Grower Books · 1985 · ISBN 0-901361-21-6 ↩︎Does not deal with many species but it is very comprehensive on those that it does cover. Not for casual reading.
  8. [8]The Plantsman. Vol. 4. 1982 - 1983. — ? · Royal Horticultural Society · 1982 · ISBN - ↩︎Excerpts from the periodical giving cultivation details and other notes on some of the useful plants, including Distylium racemosum and some perennial members of the family Berberidaceae.
  9. [9]The Reference Manual of Woody Plant Propagation. — Dirr. M. A. and Heuser. M. W. · Athens Ga. Varsity Press · 1987 · ISBN 0942375009 ↩︎A very detailed book on propagating trees. Not for the casual reader.
  10. [10]A Field Guide to Medicinal Plants. Eastern and Central N. America. — Foster. S. & Duke. J. A. · Houghton Mifflin Co. · 1990 · ISBN 0395467225 ↩︎A concise book dealing with almost 500 species. A line drawing of each plant is included plus colour photographs of about 100 species. Very good as a field guide, it only gives brief details about the plants medicinal properties.
  11. [11]Manual of the Trees of N. America. — Sargent. C. S. · Dover Publications Inc. New York. · 1965 · http://www.biodiversitylibrary.org/ · ISBN 0-486-20278-X ↩︎Two volumes, a comprehensive listing of N. American trees though a bit out of date now. Good details on habitats, some details on plant uses. Not really for the casual reader. It can be downloaded from the internet.
  12. [12]A Weavers Garden — Buchanan. R. · McGraw-Hill Contemporary · 1987 · ISBN 0934026289 ↩︎Covers all aspects of growing your own clothes, from fibre plants to dyes.
  13. [13]An Illustrated Flora of the Northern United States and Canada — Britton. N. L. Brown. A. · Dover Publications. New York. · 1970 · ISBN 0-486-22642-5 ↩︎Reprint of a 1913 Flora, but still a very useful book.
  14. [PFAF]Plants for a Future — pfaf.org ↩︎