Giedi Prime is an industrial wasteland with a low photosynthetic potential, the planet's bio-resources depleted and its environment fouled with industrial pollution.
Rich in mineral resources, the economy of the planet is based on mining, refineries, and industrial manufacture. In Dune, Baron Vladimir Harkonnen and his heirs live in the "family city of Harko."
Due to its ravaged environment, Giedi Prime has to import almost all of its food. Society on Giedi Prime has evolved around power and conquest, and the weak rarely survive. Gladiatorial games are a common form of entertainment, particularly for nobility, and vocational combat training from an early age is the norm in all classes of society. Slavery is legal and widely practised, while judicial punishment is usually draconian. Such conditions form the basis for a vast military-industrial complex and an army conditioned by fear, which make House Harkonnen the sole contender for House Atreides — or the throne — in terms of military power.
Following the events of God Emperor of Dune?, Giedi Prime is renamed "Gammu" (it is noted in Heretics of Dune that Gurney Halleck had been responsible for the renaming) and has drastically changed.Mining and industrial planet. A median-viable planet with a low active photosynthesis range. It is "A median-viable planet with a low active-photosynthesis range;" bleak and dark, it is heavily industrialized and its people are very oppressed. By the time of Heretics of Dune?, its name has been changed to "Gammu" by Gurney Halleck.
Related: Giedi Prime is to be confused with Gedi Prime?, a pleasure planet in the Star Trek universe? said to "make Risa look like a tourist trap", which the writers named as a tip of the hat to the very different planet in Dune.
Giedi is the traditional star name of Alpha Capricorni.