Kare-sansui, or dry landscape gardening, is a Japanese art form that uses carefully arranged rocks, sand, and sometimes gravel to represent a natural landscape. To take care of a kare-sansui garden, regular maintenance is required. This includes cleaning the sand, raking the gravel, and occasionally replacing worn-out stones. It is important to use the right tools and to follow the principles of kare-sansui design to maintain the aesthetic and symbolic balance of the garden.