Bamboo is [the fastest-growing plant on Earth](http://en.wikipedia.org/wiki/Bamboo); it has been measured surging skyward as fast as 121 cm (47.6 inches) in a 24. hour period, and can also reach maximal growth rate exceeding one meter (39 inches) per hour for short periods of time. Many prehistoric bamboos exceeded heights of 75 meters (250 feet). Primarily growing in regions of warmer climates during the Cretaceous, vast fields existed in what is now Asia. Modern bamboos can only sustain their maximal growth rate for short periods of time[clarification needed]. Bamboo can grow six or more inches a day though there are exceptions.........