Green tea is made by - Steaming - The leaf is steamed immediately after picking to soften them for rolling. More importantly, the heat inactivates the enzymes and prevents fermentation. Rolling - This releases the natural juices which will be held within the finished leaf to give tea its flavor. Drying - The leaf remains green in color. Green tea is packed with only 3 percent residual moisture so that the finished tea will not undergo any further change. White tea does not require rolling. They are processed in such a way to avoid oxidization - which defines green teas.