European horse-chestnuts grow up to 25 metres tall. Its springtime buds that have not sprouted are sticky. Its compound leaves are large, finger-shaped, with 5-7 leaflets, located opposite each other, and have long pedicles. The edges of the leaves are unevenly saw-toothed. The flowers form big, up to 30 cm long upright inflorescences, which are called panicles. The edges of the white petals with red spots are frayed. Blossoms in May–June. The fruit is a spiky and spherical capsule that opens into three parts. It contains 1–3 seeds that are known as conkers.