The horse chestnut tree, indigenous to Asia and northern Greece is now cultivated in many areas of Europe and North America. It is a large tree that can grow up to a height of about 39 meters and has a dome shaped crown which bears stout branches. The leaves are opposite and palmately compound which bear 5–7 leaflets. The flowers are usually white with a yellow to pink blotch at the base of the petals. Usually, only 1–5 fruits develop on each panicle; the shell is a green, spiky capsule containing one (rarely two or three) nut-like seeds called conkers or horse-chestnuts.