This blog would help my friends who grows green vegs and leafy veg at home balcony.
You need to have big cement container/pot or else a big poly bag which can sustain for at least 6 yrs.
Fill half of the container/bag with coconut husks (wetty) and next 20% with kitchen waste, if you have. Remaining fill with red soil.
If you want to sowe spinach/green leave make a 2 inch depth line in two rows and place the seeds with in them.
We can put tomatoes and creepers like keera cucumber also.