There are now new developments like vertical gardens. They may be expensive but might get cheaper in the future. Examples of such gardens you can see here (http://en.wikipedia.org/wiki/Green_wall). Of course not all plants can grow there. It is only a small fractions of the plants we know.
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Werner commented on :
There are now new developments like vertical gardens. They may be expensive but might get cheaper in the future. Examples of such gardens you can see here (http://en.wikipedia.org/wiki/Green_wall). Of course not all plants can grow there. It is only a small fractions of the plants we know.