Horse chestnut

Profile

Family

Sapindaceae

Habit

Tree

Height

30 m

Spread

15 m

Growth

fast

Lifespan

300 years

First yield

after 13 years

Hardiness

zone 4–7

Shade tolerance

partial shade

Soil

Sand, Silt, Loam

Soil moisture

dry – very moist

pH

6 – 8

Flowering & harvest

Times apply to the northern hemisphere in a temperate climate and shift with altitude and cultivar.

Uses

Edible: The roasted seeds can be used as a coffee substitute. They can also be cooked and ground into a porridge. Measuring about 3 cm in diameter, they are easy to harvest. Before being used as food, the saponins must be removed, which also eliminates many minerals and vitamins, leaving mainly starch. The seeds contain up to 40% water, 8 - 11% protein, and 8 - 26% toxic saponins. It is crucial to eliminate the saponins as they are poisonous.

Other uses: Saponins in the seeds are utilized as a substitute for soap. Obtaining them is simple: the seeds are cut into small pieces and steeped in hot water. This water can then be used for washing the body, clothes, etc. A notable drawback is the enduring horse chestnut odor. The seeds contain varying amounts of saponins, up to a maximum of 10%. A starch extracted from the seeds is also used for washing. The bark and other parts of the plant contain tannin, but the exact quantities are unspecified. A yellow dye is derived from the bark. The flowers contain the dye quercetin. The plant's wood is soft, light, and not particularly durable. It is utilized for furniture, crates, and charcoal.

Growing

Prefers a deep, loamy, well-draining soil but can also tolerate poorer, drier soils. Can thrive in exposed locations and air pollution. A highly decorative and fast-growing tree that flourishes in most regions. Trees are very hardy in dormancy but young spring growth can be damaged by late frosts. The flowers have a delicate honey-like scent. Trees can withstand drastic pruning and heavy trimming. They have a tendency to suddenly shed old, heavy branches. The tree bears fruit from seeds within 20 years. Most members of this genus are easily transplanted, even when quite large.

Propagation

Sow seeds outdoors or in a cold frame immediately after they ripen. The seeds germinate quickly and need protection from extreme weather. They have a limited germination capacity and must not dry out. Stored seeds should be soaked for 24 hours before sowing, but even then, they may still not germinate. It is best to sow the seeds with the 'scar' facing downwards. If sown in a cold frame, seedlings should be transplanted into pots in spring and planted in their final location in summer.

Notable

Special features: tolerates air pollution; prefers moist and nitrogen-rich mountain forests; Uses: Sapnonine (cosmetics, paints, foams), Starch (alcohol, lactic acid); Good horse feed; Horse chestnut~=female oak; Japanese Horse chestnut (Aesculus turbinata) traditionally used with rice flour as a dessert; Yellow Horse chestnut (Aesculus flava) produces bitter-free seeds.

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