Karesansui, or dry landscape garden, is a traditional Japanese garden that features carefully raked gravel and rock formations, often with a few, strategically placed trees. 'Long cao' refers to long grass. This phrase could imply a Karesansui garden with overgrown grass. In Japanese culture, such overgrowth can symbolize a natural, untrimmed state, which some might find aesthetically appealing. In terms of garden maintenance, long grass in a Karesansui garden might require periodic trimming to maintain the intended design and harmony of the space.