One form of vertical farming that does save space is Agroforestry, in which traditional crops are grown in a system with trees. Plants have various solar requir

One form of vertical farming that does save space is Agroforestry, in which traditional crops are grown in a system with trees. Plants have various solar requirements — some are shade tolerant. This means you can have crops, shrubs, trees, all occupying an area of land. This was first explored in the book Tree Crops: A permanent Agriculture, in the 1930s. If you lookup closely at that subtitle, you’ll see the roots of the word Permaculture.