Curry leaves are aromatic herbs used in South Indian cooking. The glossy leaves are vibrant green and teardrop-shaped, about one-and-a-half inches in length. Also called “sweet neem leaves,” they grow on the curry tree, which is part of the citrus family. The curry tree, Murraya koenigii or Bergera koenigii, is a tropical to sub-tropical tree in the family Rutaceae, and is native to Asia. The plant is also sometimes called sweet neem, though M. koenigii is in a different family to neem, Azadirachta indica, which is in the related family Meliaceae.