The title says it all. In space, the grow plots should work in any orientation ... because there's suppose to be NO gravity . You can place the blocks in any orientation, but you can ONLY put sprouts on in ONE orientation ... straight up with respect to the ship's core. You can also fly a ship with grow plots upside down, or in an infinite number of angular orientations ... but you can only place the sprouts in one direction. Just a thought from an old space engineer
If you have a mind to, this may be fixable in the config files, though I cannot offhand remember the name of the attribute that needs to be added/changed (might be 'place'?)