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i have often wondered this. i know some bulbs must be planted one way or another but seeds don't seem to care
I agree about bulbs...especially light bulbs !!
Maybe I am missing the point here, in a fascinating topic, but what is the mechanism for responding in the opposite direction to gravity? Is it in the way that growth hormones are distributed in the growing shoot? Is it that more hormone is distributed on the lower side of the shoot 'bending' it upwards due to greater growth on the lower side, against the force of gravity? In that case where in a plant is there a gravity receptor? Am I being silly here?