Leaf

A leaf was a component of plants and trees.

Uses
Tea plants had leaves, which were used to make tea. Raspberry leaf tea was good for the ailments of the throat. Tea leaves were also read by psychics to read the future. (TV: The Awakening, AUDIO: Casualties of War, TV: The Sun Makers, TV: The Curse of Clyde Langer)

Tobacco leaves were used in making cigarettes. (PROSE: History 101)

Leaves in plants and species
Some clovers had four leaves, and were considered lucky. (COMIC: Triskaidekaphobia)

Cadonwood trees, trees native to Gallifrey, had silver leaves. (AUDIO: Neverland)

The trees native to Fragrance also had silver leaves. (AUDIO: The Fragile Yellow Arc of Fragrance)

Time Trees, native to Hirath, had orange leaves. (PROSE: Genocide)

Poppito trees, trees native to Raxacoricofallapatorius, had reddish-brown leaves. (PROSE: The Monsters Inside)

History
In 1981, a leaf dubbed "the most important leaf in human history" brought Dave and Ellie Oswald together. Their daughter Clara kept the leaf as a keepsake.

While on a colony built entirely on one giant tree, the Eleventh Doctor and Amy Pond once used a giant leaf as a parachute when escaping the Pulpavores. (COMIC: The Evergreen Death)

The the floor of the TARDIS Cloister Room was covered in dried leaves. (TV: Doctor Who)

During the autumn, dead leaves would fall to the ground. People would then blow the leaves away with leaf blowers. In a dream, Rory Williams at first mistook the sound of the TARDIS materialising for the sound of one. (TV: Amy's Choice)