Dear Chantal,

I don't know if you read French, but I found this article about Guerrilla Gardening (by Lélia Reynaud-Desmet) in Paris interesting:

http://www.cairn.info/resume.php?ID_ARTICLE=LIG_763_0036

Here is some information on Cape Town, as well as people you can contact for further info:

http://www.capetown.gov.za/en/mayor/EconEventsSpatPlan/Pages/Urban-agriculture.aspx

http://www.capetownmagazine.com/social/food-for-thought/118_22_18970