Against every good, workable idea, 99+% are conditioned to argue 'Why it cannot be done'; only a fraction of a percent would love to demonstrate "How it can be done".
This Paper entitled, "Grow Your Own, Healthy, 100% Chemical-Free Organic Vegetables, at your un-used spaces!" too is conceived by one such person.
Kindly study the same and practice and propagate the idea.
For any clarifications, please contact me at firstname.lastname@example.org.