Vertical and indoor farming works financially for lettuce, kale and some other plants
Here is a calculation that hydronponically grown lettuce is cheaper with a cost of about 4 cents per head. Lettuce can sell for about 0.99 to 1.75. Philips and GE are supplying special LED lights to lower the energy costs of indoor lettuce farming. They also grow the lettuce in racks so that every two …