The history of tea in South India is closely intertwined with the history of scientific research, innovation and technological advancement. For a century, the UPASI Tea Research Institute has stood at the forefront of this journey, providing scientific solutions to the evolving needs of the tea industry. The completion of 100 years of tea research is therefore not merely a celebration of institutional longevity; it is a celebration of a century of scientific endeavour, innovation and service to the south Indian tea industry. Over the decades, research at UPASI TRF has evolved in response to labour shortage, emerging pests and diseases, climate change, market expectations, food-safety requirements and the increasing demand for quality and sustainability. Through this journey, the Institute has brought together diverse disciplines to strengthen the scientific foundation of tea cultivation and manufacture.