Freeth secretly fomented wars on other planets so that the bodies could be used as fertiliser for rapine. (AUDIO: The Paradise of Death)
In Kenya, Gero and Chipo were chosen to test an experimental fertiliser which also caused rapid growth in animals. (COMIC: Buzz!)
When a global forest grew overnight, the Twelfth Doctor noted that it couldn't have been created with extra special fertiliser. (TV: In the Forest of the Night)
On a human colony planet, the Vardy used the bones of the colonists the Emojibots killed as fertiliser. (TV: Smile)
The Kromon turned those unfit for slave labour into fertiliser. (AUDIO: The Creed of the Kromon)