||There are about 15 species of deciduous shrubs to tall trees in this genus. More than half are native to North America where they are commonly called buckeye. The remainder are spread from Asia to southeastern Europe. They generally grow in deep soil in sheltered valleys. The large compound leaves comprise 5 to 11 leaflets palmately arranged, and in spring to summer showy upright panicles of cream to reddish flowers are borne. The inedible fruits are contained in big seed capsules that vary from smooth to spiny and give rise to the other common name, horse chestnut.
||CULTIVATION: These trees perform best in cool-temperate climates where marked differences in summer and winter temperatures occur. The larger species are well suited to parks and open landscape plantings where their pyramidal crowns can develop fully. They need a deep, fertile and moisture-retentive soil. Propagation of the species is by seed, which is best sown fresh, and cultivars are grafted in late winter.