From my experience, once people dive in and grow their first edible garden, something magical happens. A natural addiction occurs and the first-timer then just wants to expand and grow more food. For those with a lawn, I suggest using that large space to really expand your garden. If you’d like some inspiration, check out some beautiful photos on Treehugger.
On the flip side, once urbanites expand their garden, sometimes they have clashes with the local wildlife they never knew lived in their neighborhood. I think fences are a great option. For some inspiration and instruction on fences, check out this article on Mother Earth News.
Questions? Email me anytime at firstname.lastname@example.org