This is an expansion pack for 5 players. To use the cards, they are simply added to the game and then removed when playing with fewer than 5. The flower cards will have no "filler," so they can be easily distinguished from the cards in the base game. Also, I will slightly change the color of the purple vases to make it easier to pull them out. The other cards will be easy to remove as needed. Note also that the lack of filler adds a new element to the game if you're using the filler scoring, as these flower cards will not give bonus points. —description from the publisher