The seed is rich in saponins. Although poisonous, saponins are poorly absorbed by the human body and so most pass through without harm. Saponins are quite bitter and can be found in many common foods such as some beans. They can be removed by carefully leaching the seed or flour 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 food that contain saponins. Saponins are much more toxic to some 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[K]. The flowers of this plant are toxic to bees.
Seed - cooked. It can be dried, ground into a powder and used as a gruel. The seed contains about 23% protein and has an agreeable taste. The seed is large, and can be up to 5cm in diameter. It is often produced abundantly in the warmer areas of Britain and is easily harvested[K]. This was the most commonly used Aesculus species in N. America. It does, however, contain poisonous saponins (see the notes above on toxicity) and so needs careful preparation before being eaten. The seed needs to be leached of these toxins before it becomes safe to eat - the Indians would do this by slow-roasting the nuts (which would have rendered the saponins harmless) and then cutting them into thin slices, putting them into a cloth bag and rinsing them in a stream for 2 - 5 days. Most of the minerals etc would also have been leached out by this treatment[K].
The seed is rich in saponins, these are used as a soap substitute. The saponins can be easily obtained by chopping the seed into small pieces and infusing them in hot water. This water can then be used for washing the body, clothes etc. Its main drawback is a lingering odour of horse chestnuts[K]. Wood - soft, light, very close grained. Of no value as a lumber. The wood was used as friction sticks for making fire by the North American Indians.
Seed - best sown outdoors or in a cold frame as soon as it is ripe. The seed germinates almost immediately and must be given protection from severe weather. 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. It is best to sow the seed with its 'scar' downwards. 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.
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Prefers a deep loamy well-drained soil but is not too fussy. Requires a position in full sun. Prefers dry sunny locations. Although fairly hardy throughout Britain, it grows best in areas where winter temperatures do not fall below -10°c. A moderately fast-growing and long-lived tree in the wild, in Britain it grows best in eastern and south-eastern England. Plants thrives at Kew. Most members of this genus transplant easily, even when fairly large.
Problems, pests & diseases
Associations & Interactions
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