 Yields for most crops are low, primarily due to the traditional methods of farming.The three major cash crops in the Anosy region are coffee (primarily from the Ranomafana area), rosy periwinkle (southwestern coast of Anosy and coast of Androy) and sisal (Amboasary area).Malagasy rosy periwinkle was researched by Eli Lilly beginning in 1958 for its potential use in preserving insulin.