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So it looks like so long as they're deep enough to turn around and sort them selves out beans are fine which ever way up they go in the soil.
The seeds don't need to turn round, as such, the root grows out of the appropriate part of the seed, whichever way up it is, and then gravity makes it then grow downwards - so the root grows in a bend until pointing downwards. Ditto for the shoot which also uses gravity to grow upwards. Gravity acts on chemicals in the plant cells to cause this effect - so called "geotropism"
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