Colonisation means founding a new Grepolis city from scratch. The official support guide lists building, unit and culture requirements; check them in your own Academy and Harbour because costs and values may change.
Meet the prerequisites
The documented baseline includes an Academy level needed to research a colony ship and a Harbour level needed to build it. You also need an available culture slot. Verify these requirements in the live interface before investing.
Protect the colony ship
A colony ship is typically consumed when it founds a city. Plan travel time, naval protection and land support. Once the new polis exists, it needs its own economy, research and defence.
Review culture points, ships and the Grepolis hub.