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“As early humans moved about, they were accompanied by a whole entourage of creatures they had come to depend on, or learned to coexist with â€� not only their crop plants and domesticated animals, which they carried with them deliberately, but also the creatures that had adopted them during their lengthy process of developing agriculture and animal husbandry and building habitations and cities, roads and canals, seaports and fortifications. To quote Anderson [Edgar Anderson, Plants, Man, and Life:]

‘Unconsciously as well as deliberately man carries whole floras about the globe with him, he now lives surrounded by transported landscapes, and our commonest everyday plants have been transformed by their long associations with us so that many roadsides and dooryard plants are artifacts. An artifact, by definition, is something produced by man, something which we would not have if man had not come into being. That is what many of our weeds and crops really are.”
― Richard Orlando, Weeds in the Urban Landscape: Where They Come from, Why They're Here, and How to Live with Them