[adrian_b]

While that is true, plant roots and stems use gravity to know in which direction to grow (roots down and stems up), so that will cause problems in space.

NASA has succeeded to grow some plants on the ISS, by making them grow towards a source of light (i.e. LEDs), but until now this has worked only for some very low-growing plants, like lettuce and some varieties of cabbage, not for plants with deep roots and high stems.

It should be much easier to grow algae in the absence of gravity, but those are not as tasty as terrestrial plants.

[datavirtue]

You could probably engineer some palatable food items with algea and mushrooms. I would put my money on fungus as a food source.