how to cultivate some thing profitable on roofs of city houses ,as several acres of land is unused in form of roofs

Hi Praveen, As Shiksha is an Education portal which gives guidance to the students to choose their career and education options, you would not find much information related to your topic. However, as suggested by Excel you can think of making a kitchen garden at the roof top and cultivate vegetable

Very thoughtful question. One needs to have enough soil and water on the roof which makes the financial feasibility negative. Maintainence also becomes costly. Some well to do families (who can bear the these costs) grow vegetables and flowers plants (which dont require deep roots). Your Idea is nic