Rooibos is usually grown in a small area in the region of the Western Cape province of South Africa. Generally, the leaves are oxidized, a process often referred to as fermentation in accordance with tea processing terminology. This process produces the distinctive reddish-brown color of rooibos and enhances the flavor. Unoxidized "green" rooibos is also produced, but the more demanding production process for green rooibos (similar to the method by which green tea is produced) makes it more expensive than traditional rooibos. It carries a malty and slightly grassy flavour somewhat different from its red counterpart.