Geranium

The Eleventh Doctor looks a his geranium named Dave. (COMIC: Space in Dimension Relative and Time)

Geranium was a type of flower on Earth.

The Fourth Doctor explained that it was terribly difficult to cultivate away from Earth, and that it was Charles Dickens's favorite flower. (AUDIO: The False Guardian)

The Eleventh Doctor had a red geranium, which he called Dave. (COMIC: Space in Dimension Relative and Time)