Bamboo can grow up to 91 cm in a single day.
Why it is true
Certain species grow so fast you can literally watch them. They achieve this by using a unique rhizome system that stores energy underground before shooting up.
Source: Botany
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This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.