Planting trees is really important for us human. Why? Think of it's direct benefits such as it gives you shade, when it bear fruits it provides you food, when you sell the fruit it gives you money, when you gave away fruit it makes you friend, provide you woods, prevent your place from erosion, and more important gives you free oxygen. Also, trees are your workers who clean your carbon footprint in the air.

One tree is enough for a household. However, if your living in the middle of the metrocity, planting edibles on your rooftop means a lot.