"Trictinia has culled many times." -Teyla
Trictinia is a planet in the Pegasus galaxy that has a Stargate. The planet has a residence located at a distance from their Stargate. People from other worlds usually come to Trictinia to trade with the Tricti.
In 2009, Trictinia's population and crops were subject to Wraith culls, before being contacted by the Atlantis expedition, who used to make trips to the planet for trading purposes. (ATL: "Stargate Atlantis: Legacy: Homecoming")