>>800335The official registration for "naturalised" usually has some high obstacles, IIRC here the plant must have been growing and re-seeding itself for at least 25 years for it to be recognised as "established". Therefore for example figs, which have been seeding themselves out for decades here but needing human interaction to remove other plants that could out-compete them, are not considered "established" or "naturalised" yet even though they've been growing weed-like in many ruderal places for many years to decades
