Amazon. For a free online guide to wild foods found in the urban environment, by Marcus Harrison (2008), click here.
As a child I remember picking blackberries when we were away on holiday, or occasionally at home on the way to the shops, but that was about as far as foraging went. But I've been doing it for a while now, we've made nettle soup, elderflower cordial, quince chutney, damson jam (that went a bit wrong), dandelion fritters, rose water and often eat leaves and fruit as we find them (always above dog height!). It is something that is becoming increasingly popular and children (as well as adults) really love following the journey from plants found growing wild to a finished, tasty food. Here are a some of the basic plants that you can find growing wild in the city and eat, and I will add links so that you can find out more about them, and, of course, some recipes:
Beech : Blackberry: Cleavers : Damson : Dandelion : Elder : Hawthorn : Hazel : Heather : Nettle : Rose : Rowan : Sloe : Sweet Chestnut : Quince
If you are eager to get out foraging whilst I am adding the information and recipes to this list, or if you want to find out about all the other edible wild foods available, I really do suggest getting the Food for Free book; I have it, it is really informative and great value for money.