Not too enticing! Grow your own tree-bark for cooking?
I love the idea of community gardening, too. It needn't be confined to vegetables, either - there are plenty of grass verges and semi-derelict or neglected areas that could be beautified, adding to the amenities of an area and lifting people's spirits, as well as helping gardeners to develop their skills. B and Q used to have a scheme with cut-price plants to encourage this, but I don't know if it still exists.