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How do climbing plants climb? © Getty Images

How do climbing plants climb?

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These plants usually start by creeping along the floor but physical contact triggers chemical changes that start the climbing behaviour.

Asked by: Nick Davies, by email

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Climbing is a parasitic behaviour that saves a plant the effort of making a strong trunk or stems of its own. There are several distinct strategies. Ivy uses specialised roots that work into tiny fissures in tree bark or a wall, while clematis has leafstalks that twist around the stems of another plant to anchor it as it grows. Cucumber plants have tendrils that wrap around another stem and then pull the plant up by coiling up the tendrils.

Climbing plants normally start by creeping along the floor until they reach a stem. Although the point of climbing is to escape the shade, some tropical climbers begin by growing away from the light, because this makes them more likely to reach a tree trunk. Once they touch something, the physical contact triggers chemical changes that stimulate the climbing behaviour and the plant begins to grow against the direction of gravity.


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Authors

luis villazon
Luis VillazonQ&A expert

Luis trained as a zoologist, but now works as a science and technology educator. In his spare time he builds 3D-printed robots, in the hope that he will be spared when the revolution inevitably comes.

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