The Parc Andre Citroen in the 15th arrondissement in Paris is 14 hectars of contemporary landscape architecture. The park consists of some modern steel and glass structures at the south end, which are in fact large greenhouses. On one side of the parkare a series of concrete walls with built-in waterfalls. A man-made river runs alongside the walls. Across from the concrete walls is a wall of green - hedges and trees. This part is sectioned off into gardens with various color themes, such as the blue garden, which is filled with plants whose flowers are various shades of blue.