At game start, the structure does not produce any infested civilians until 180 seconds have passed. At that point, it produces 8 infested cocoons every 60 seconds, which after 30 seconds become infested civilians, rallying to the psi emitter (The rally point automatically places the emitter). This ability is autocast but could be deactivated. The hotkey is D.
Upgrades (called infestation levels) allow the compound to produce more infested civilians.
Because the infested civilians have timed life of only 90 seconds, the player should move the infested colonist compound close to the center of action. Its uproot abilities enables it to walk about the battlefield.
Root: Roots the structure at a target location (on creep), allowing it to once again produce units, research upgrades, and use abilities. Uproot: Uproots the structure, allowing it to move about freely. May not produce units, research upgrades, or use abilities until it is rooted.