Turmeric grows wild in the forests of Southeast Asia. It has become the key ingredient for many Indian, Persian, Thai and Malay dishes, not only in curry, but also in masak lemak, rendang and many more.
Although most usage of Turmeric is in the form of powder from the roots, not merely for color but in case of Indian cuisine more for the medicinal value, in some regions (especially in Maharashtra) leaves of turmeric are used to wrap and cook food especially when on picnic in a field but really at homes as well. This usually takes place around where turmeric grown, since the leaves are used freshly picked. This imparts a distinct flavor but has medicinal value as well.