The vacuum (also called negative pressure) is created by evaporation from leaves at the top of the plant. There is also positive pressure that is created by having different concentrations of things like sugars, which moves water into and around the plant by osmosis.
[https://en.wikipedia.org/wiki/Xylem#Main_function_%E2%80%93_upwards_water_transport](https://en.wikipedia.org/wiki/Xylem#Main_function_%E2%80%93_upwards_water_transport)
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