Look into native plants. There are so many edible things that you can just leave in the wasteland that is your yard and they’ll take over. Here in Tennessee we have pawpaws and maypops for fruit, tomatoes that pop up randomly, garden greens like wood sorrel and lambs quarters, and a bunch of other things that absolutely take over given half a chance. Sure, if you try and grow the seed packets from your local Lowes you’ll have issues with pests and whatnot, but there is so much more food out there than these varieties.