hi,
Recently I have that thinking. For some of the weeds we know at the moment, e.g. agapanthus and sweet pitto ( that sounds like sweet potato to me at the very beginning), will that be a popular plant many years ago at a particular area?
So what happens when those of you who lived in an established area, established house which the garden may have been built many years ago, the once-you-treasured plant/ the well established, healthy, beautiful plant in your garden done before you is known as a weed! ( will that ?)?
I think if it happens to me, I probably would just neglect that. Unless I don't like that plant.