United Kingdom

To begin with, it takes three acres of land for the industrial food system to feed the average American for a year, compared to maybe 5% of that area—or even much less—to feed a person for a year on a balanced diet of garden vegetables.

https://www.unsustainablemagazine.com/home-gardens-vs-farms-efficiency/

Written by a professor of botany https://justgrowityourself.com/about/about-david-fisher/

I have a tiny plot, far smaller than most rural gardens, and currently have growing: peas, beans, nasturtiums, lettuce, beetroot, carrots, leeks, spring onions, garlic, brown onions, chard, broccoli, kale, strawberries, blueberries, blackberries, raspberries, basil, rosemary, thyme, parsley, fennel, apples, chives, nettles, dandelions, bay, marjoram, and fenugreek. All are edible, even if some are deemed weeds or just flowers by most. You'd be surprised how much can be packed into a small area!

Don't take my comment to mean I think it's the solution to food deserts, but it's certainly part of it. Obviously in winter it's pretty useless, but for most of the year it can go a long way in helping. Not to mention the mental health benefits for individuals playing outside and the environmental benefits for communities increasing biodiversity.