@Walter Hinteler,
I saw a programme not so long ago where they (some London councils) are fitting vertical gardens to various grotty walls around the City, and planting them up with all manner of (mainly) hardy herb.
Rosemary, Sage, Marjoram, Mint etc., in the hope that it inspires parents to show kids what herbs are all about, and how to cook with them.
I am a big fan of vertical gardens.