Terraforming Mars

How does end of the game greenery conversion work?

After the last Production phase players may, in the preserved player order, convert plants into one or more greenery tiles. The greenery tiles are paid for (with 8 plants each) and placed one at a time, triggering placement bonuses and other effects before the next tile is placed. When that player can't place any more greenery tiles, the next player goes. After every player has had a chance to place greenery tiles, end game scoring begins.