Gartenbau is a 2-4 player game in which players place and layer tiles in a tableau to meet the growing requirements of specifically drafted flower tiles.
More generally, you and your fellow players are gardeners racing to create and grow a garden that contains four fully mature flowers, along with other seedlings and plants, in an effort to earn the most prestige by fulfilling each of the flower's unique growing requirements. The player with the most prestige at the end of the game is crowned "Gartenmeister" — The Master Gardener.