In my experience it does actually matter which hemisphere you plant them in. I have, on quite a few occasions, 'smuggled' seeds both ways (hope the authorities aren't monitoring this ) only to find that I couldn't get them to germinate - something to do with the opposite seasons I was told. Which, I suppose, at least confirms that they are programmed.
Can't find an answer to that on the internet Yorkie, but then lots of learned people cannot agree on why they twist. Do know though that if you plant a seed upside down it will turn so that the roots go downwards, and that is caused by the pull of gravity.
I think anyone who reads through this thread will be more confused about gardening than before they started
Should be a good year for fruit what with the good weather and no frost in May.... However for those of you thinking of growing Kiwi fruit:
The kiwi is a perfect example of what a bit of marketing can do for a product. I can remember when said fruit was sold under its original name of Chinese gooseberry - it never took off and was only 'on the shelves' for a season or so. If only the Kiwis would take over production of the babaco - another fruit that appeared in shops in Queensland back in the 80's but never took off and disappeared quickly. A naturally fizzy fruit, it made the most delicious home made, champagne style wine I've ever tasted - I was somewhat miffed when shops stopped selling it. I'm thinking of buying a tree from Jungleplants just to see if it will grow up here - don't suppose anyone knows anything about them?
The reason why seeds twist to allow the roots to grow downwards must have to do with them growing in search of nourishment - which the roots can only take up in liquidized form. Therefore roots will always follow sinking water levels. Generally, the worst thing you can do for any plant is to water them often with a little - better to water them seldom (Only when absolutely necessary) but with a lot of water, this forcing the plant to develop a good rooting system which will in turn help it over the winter. A little bit here and there ,in contrast, leads to plants taking their nourishment only from the top layers - and thus , in some cases,practically growing upwards.
Ah.... thanks I love Roses.. my favourite flower.... and incidentally I have a distant relative who bred and sold roses http://www.davidaustinroses.com/english/showrose.asp?showr=663 and my daughter is a Rose too....