This question already has an answer here:
As far as I know, roots of plants grow to the direction of Earth's gravity - this is called gravitropism.
But what happens if plants are in space? Are they able to perceive gravity in state of weightlessness? Either way, where do they grow their roots in those circumstances?
Note: this question may fit better either to Space.SE or to Astronomy.SE, but I was not sure about it.