How do vines 'know' how to wrap themselves around a host stalk or post?
This afternoon I was idly pulling some vines that had wrapped themselves around a few of the hedges outside my house. It occurs to me that I’ve never understood how vines manage to ‘wrap’ themselves the way they do. It’s one thing to grow through underbrush and sort of ‘intermingle’ to get support that way, but how do vines manage to make a continuous ‘wrap’ around a post or other single stem? And do they always ‘wrap’ in the same direction? Do vines in the Southern Hemisphere wrap in the opposite direction?
This question is in the General Section. Responses must be helpful and on-topic.