Check out this site for some ideas: http://www.ediblelandscaping.com /
I was thinking olive, but that might not work in zone 5.
|| I am on a low carb high fat "paleo diet". In the front yard, we have
|| a concrete retaining wall that is a boundary of our land. Beyond the
|| retaining wall, 3 feet lower, is a public sidewalk. I rented a
|| monster tiller recently, and tilled a 24" strip of land immediately
|| adjacent to the retaining wall. (did a lot of other tilling to plant
|| a lawn elsewhere).
|| My desire is to plant some pretty, high fat, low carb, edible plants
|| that are not grains.
|| I live in Zone 5 (N Illinois).
|| One plant that I can think of is sunflowers. Maybe I will throw some
|| corn into it, for looks and for other members of my family, but I am
|| looking for other suggestions.