[Jay Dubya]

Hi, these proffesors have got nothing on us gardeners!!

[sunshineband]

I use the right-hand-rule.  Clench fist, and point thumb.

Thumb upwards, in direction of growth, and fingers indicate the (anti-clockwise) direction of twining.

Still have to remember which hand to use though ...

  That's a rule I've not heard befote