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Unmaintained backstreets got by far the best greens, as the soil is also the richest and healthiest you can find around, as opposed to the ultra-toxic soil of parks, abandoned lots (likely contaminated), etc. The patches of backstreet soil collects compost naturally from surrounding trash and water drains, while the usually rough pavement of backstreets helps filtering waters. Plus, since most people disdain those areas they're unlikely to get depleted overnight by waves of urban foragers. Of course here I'm not referring to those sanitized yuppie hellholes.

Some very good nutritious greens usually grow in these backstreets, such as thistles, burdock, plantains, wild lettuces can be found where nobody cares, even wild berries if you're lucky. Those are protein and mineral rich, while unlike nuts they're available year-long. Obviously these won't be the "cleanest" edibles and might contain a level of toxins, but that's the best you might get in the city without having your spot on some yuppie community garden (that may still be contaminated anyways). Wild greens grow without need to be maintained, but the soil may also be great for planting good greens around.