I live in a small rented room where there is no garden space, but it's just a short walk to the grocery store. Also a short walk to work.
Some survivalists fear that oil prices will cause a collapse down our food chain from fertilizers to the trucking industry. Oil does play a part in food production, but it's only a part. Prices at the grocery store have risen, due in part to energy costs, but energy is only a slice of the overall food cost pie.
At the grocery store, these price hikes are still mild compared to the relentless rise in health care costs that Americans have been enduring for years. Also the relentless rise in property values and in some cases rents that has taken place until just the last year.
Now property values are starting to drop to almost more reasonable levels. Southern California, still well over $400,000 single family home. Amazing how expensive home ownership can be.
As for energy costs, yes it does ad a bit to the cost of food. What's more devastating is the cost of commuting. Remember the phrase, "drive till you qualify?"
Those who live closer to jobs and errands might be less likely to have garden space, but the savings in automobile cost can be great.
Then there are community gardens that people can lease space in, if they have the time. If they have the time after working full time and trying to hang on to their health insurance.
Gardens are nice if one can afford the space to have one. Also I am glad someone is still farming so there can be food in the grocery store.
Also remember, there are people still planting flower gardens. Rather than always being practical, they are still bringing color to this world. That's nice, especially as I am biking and taking the time to smell the roses.
Glad I've never learned to drive a car and it's good to be healthy. Enjoy exercise.