Continuous application of chemical fertilizers in tea gardens may increase production, but it adversely affects the quality of tea. There is therefore growing interest in rhizosphere associates of tea, including symbionts such as arbuscular mycorrhizal fungi (AMF). These colonize tea plant roots and support both growth and improvement in the quality-related parameters of tea. This chapter reviews the use of AMF-based bio-inoculants in tea cultivation. It begins by discussing the range of AMF associated with tea and their effects on the tea rhizosphere. We consider the development of an AMF-based bioformulation for use in tea plantations, and then review the effects of using such a bioformulation on both tea plant growth and tea quality.