Bamboo grows in clumps (although running varieties exist). The runners can be up to 40 metres (130 feet). David Farrelly, in his book "The Book of Bamboo", says that bamboo has been measured to grow 1.21 meters (47.6 inches) in a 24-hour period. However, most bamboos (used for gardening) will grow more like 3 cm to 5 cm (1-2 inches) a day.