Dealing with really persistent weeds

This is a question I have been asked to tackle often- how do we deal with the weeds that never go away? What about-

Convolvulous, that is coming over from next door?

Acanthus (Bear’s Breeches), growing out from underneath concrete?

Yeesh.

There are some really simple initial things to focus on, but in reality sometimes we just have to live with the situatio…