The mention of even being able to grow potatoes in the soil doesn't seem that impressive, I've had those grow while confined to an otherwise empty plastic bag in my pantry. Those things can grow basically anywhere.,(reply>), Aha fair point! I emphasised that because there was a real struggle until recently to grow potatoes in Martian soil simulant. Some suggested it was due to the clay-like consistency of wet simulant that didn't allow the potatoes to expand and grow.