How do vines 'know' how to wrap themselves around a host stalk or post?

How do vines 'know' how to wrap themselves around a host stalk or post?
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Answer :

We had morning glories that would wrap themselves around other plant using the right hand rule. There were more wraps than days so they plants are not following the sun. Also about one plant in 20 would wrap using the left hand rule. What is up with that? I am in the Northern hemisphere so I eagerly await a report from an Aussie on this one.
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