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I'm from a suburb of London,
sorrel grows on wasteland around here, along with fennel (the tall type).
lots of cherry and plums too.
as for fungi, i've seen chicken of the woods growing on trees a few streets away, which was surprising. plenty of oyster mushroom in the wild area of the local park, and these little fellas pop up everywhere, which i think are ink caps. these guys are in my compost bin