@guerrilla gardeners, solarpunks and plantarchists of all stripes we need to make a good guide to growing food stealthy style
i'm talking growing in rental properties without alerting the landlord, growing on vacant/unused land, stuff like that
I think a good first step is to notice what edibles and natives are already incorporated into landscaping, and just ignored. Here, for example, commercial landscapers plant our native evergreen huckleberry, which has much to recommend it, both as a "landscape" plant and edible: evergreen, easy care, subtle flowers, berries that ripen long after others, native as mentioned so supporting native animal species, tasty, humans and others enjoy the fruits. Yaupon holly isn't native here, but it's still used and is non-invasive while providing caffeine and theobromine(!), evergreen, pleasantly bland looking for fitting right into whatever landscape already exists. People plant rosemary, sage, sweet bay, lavender, etc for aesthetics but they're all very tasty too, obviously. Elderberries are gorgeous, and used all the time. My city planted chestnuts, and a lot of people go and forage for them (more so during bad economic times, but still). Also things that are food crops, but don't look like food crops: sunchokes, a species of daylily, camas, rhubarb, artichokes, cardoon, native strawberries, etc. Asparagus is a really neat looking plant. Scarlet runner beans are beautiful, and attract hummingbirds, while also making beans. Snow peas are also very pretty vines.
For vacant/neglected land, it's great to learn what invasives, weeds, and tough & abundant natives are edible. Giant knotweed, Himalayan blackberries, yarrow, etc fill-in-your-plants-here. Also it's great to go around pulling out invasive species because people will just think you're a really committed environmentalist, and you can harvest other edibles while you're at it. Be doubly sure about the land history though, don't want to unknowingly be picking from a superfund site! And for goodness sake, be sure of your ID! I've seen people mistake Oregon grape (native) for English holly (invasive) before, and you don't want to be that person.
With tubers/roots especially, you need to know the history of your soil and/or get a soil test for heavy metals. There are ways of improving polluted soil, and certain plants/parts of plants have less or no contamination. Cornell has a pdf available for free titled "Soil Contaminants and Best Practices for Healthy Gardens" which has a lot of good information, please do read it if you're gardening or foraging in urban areas.
From experience, landlords often have no clue and don't care if things are grown in pots/incorporated into existing landscaping. A big pot with Swiss chard, lettuce, kale, etc can look pretty aesthetic. Apartment complex often have edible invasives and/or the above mentioned edible and/or native plants- and nobody picks them.
You can also learn to graft, and graft fruit bearing varieties onto existing ornamental varieties- crab apples, pears, cherries, plums, etc.
A lot of people just straight up ignore plants, and a lot of people have no clue what food looks like if it's not in a store or restaurant. Use this to your advantage. I have seen landscapers look at a plant that clearly doesn't belong (invasive spurge laurel, for example, which is neither a surge nor a laurel), or is growing up through another (hazelnut through a rhody), and just completely ignore it, watering, fertilizing, and pruning them just like the rest. The ones most likely to do this are the ones that "prune" everything to be a cube or sphere though, so keep that in mind. What can still produce food when whacked into a cube? A few things. Also, look for the edges and backs, and places where the landscapers let things slide a little because they figure the clients won't ever look there.
Another big thing that gets ignored is that a single fruit tree often provides much more fruit than a small family will reasonably eat, and often a tree was planted literally decades ago and the current residents don't care about it's fruit. I've gotten loads of figs, apples, pears, grapes, etc just by asking- or by offering to make them a fruit crumble from their fruit tree if they let me pick as much as I want. Back alleys get invaded by out of control raspberries, blackberries, walnuts, etc.






















