With its slender silhouette and large, hanging leaves, the banana resembles a tree. However, it is actually a giant grass whose only perennial part is an underground stem (rhizome). Native to South-East Asia, the banana is now found in tropical regions throughout the world. There are several varieties of banana grown for their fruit, which is eaten green or ripe. In traditional medicine, green banana is used externally for its healing properties. In cosmetics, green banana extract promotes the synthesis of collagen and the healthy organisation of dermal structure.