Council Reserves- reserved for what???

Why are Council parks called reserves … are they are sitting in no mans land waiting for someone to do something with them… Why not allow neighbours of the parks to turn a small or large area into a food forest… we have an exemplar for how to do it in Kaiapoi.. and could be in a park near you if you so desire…imagine a park filled with food… any able to come and collect and forage food… you get to choose what you want to plant