Alvega

Alvega was the planet that was closest to Skaro and the homeworld of the Amarylls. Alvega had no animal life, only plant life, and was ruled by the Controller. When the Daleks attempted to conquer the planet, the Controller and the Amarylls fought back. Eventually, all but one Dalek was destroyed, and when this Dalek destroyed the Controller, the planet exploded. The Dalek Emperor observed the explosion and decreed that whatever the Daleks could not conquer, they would destroy. (DC: The Amaryll Challenge)