what's the difference between Japanese and Chinese green tea

All teas come from the same plant: the Camellia sinensis. What sets Japanese green tea apart from the others is how it is processed. Instead of beginning with a drying process, Japanese green tea is made by immediately steaming freshly picked tea leaves. This prevents fermentation and is thought to inactivate potentially harmful enzymes while leaving the healthy antioxidants intact. These antioxidants, called polyphenols, account for the asserted medical benefits of green tea.