One Tea Plant, Many Teas
Black tea, green tea and oolong tea look and taste very different. One is dark and strong, and another is pale and grassy. You might guess that each one grows on its own kind of plant. In fact, they all come from the leaves of the same plant, a shrub with shiny green leaves.
The difference comes from what happens to the leaves after they are picked. Tea pickers often take only the tip of each branch, the bud and the youngest leaves. Then the leaves are left to wither, which means they lose some of their water and go limp.
For black tea, the next step is to roll or bruise the leaves. This breaks open their cells so that the juices inside meet the air. The air changes the leaves, and they turn dark brown. The change also builds deeper, stronger flavors. Once the leaves are dark enough, they are dried with hot air.
Green tea is handled another way. Soon after picking, the leaves are heated, either in a hot pan or with steam. The heat stops the leaves from changing color, so they stay green and keep a fresh, light taste. Oolong tea sits in the middle, because its leaves are allowed to change only part of the way.
Some drinks sold as tea, such as mint or chamomile tea, are not made from this plant at all. They are made from other leaves and flowers.