It could be due to the earths hemisphere? water is effected by this so im guessing that plants will be aswell...

Some winding plants such as morning glory and wisteria wind counter-clockwise (CCW). Others, such as hops and honey suckle wind clockwise (CW). Supposedly you shouldn't force them to wind in the "wrong" direction or they will wither.Although it is said hops winds clockwise to follow the sun (Olson - americanbrewmaster.com), it seems the actual direction of winding is determined by the plant's genes and gravity.Japanese researchers (Hashimoto) found that a slight difference in the structure of tubulin, a microtubule protein in cells, determines the winding direction. They chemically mutated a straight growing vine until some wound left (CCW), then looked at the molecular structure of twising. It was published in Nature. Other Japanese researchers (Kitazawa,et.al) found that gravity sensing cells are indespensible for shoot circumnutation (bending and bowing of the tip) and winding response. It was published in PNAS.So the plant knows which way is up from the gravisensing cells, then the tubulin structure determines whether it winds CW or CCW in relation to up. Quinn SmithwickCambridge, MA, USA

perhaps a more interesting related question concerns seashells (molluscs). Apparently (and this was told to me by a competent sounding collector), all of them except one "bunch" (specie?) spiral in the same direction.

How, why, when did this recalciumtrant (sic) bunch appear?  Is there a hydrodynamic advantage for the normal ones (when close together in a current or surge)? (thesis material?)?

I am a competent googler but a quick search did not verify the gentleman's assertion. Perhaps the moderator may wish to pose these questions in neat coherent english?

ISN'T NATURE WONDER_FUL