Discussion: The future of crop-growing

My brother already gave an idea of having multi-level greenhouses growing fruit and vegetables in the future. In some places they already do that. And hey, what better way of keeping out pests than with walls or windows?

There are other ways of course. During the second World War, the moat around the Tower of London was turned into one large vegetable patch. I'm not necessarily suggesting we do that now, I'm just pointing out that farmland can be found or placed anywhere. Newer blocks of flats these days have gardens on the rooftops. In other building designs, you find gardens in an open-air area halfway up the building. These can also be turned into viable allotments.

There are also some science fiction stories that have space ships with airponics bays or garden chambers. One key purpose of these is to produce oxygen for the ship. The other is to grow food. In the future, when we do manage to colonise our moon and beyond, I can easily see crops grown on space stations being a key trade commodity.