Not etiquette but on current topic. What's harder to kill Ivy or "Wandering New" (bad name). We currently have both in our backyard and the guy redoing it for us reckons he's going to need to poison multiple times (and possibly tress poison?)
Creeping Christian? Marauding Muhammed? https://en.wikipedia.org/wiki/Tradescantia_fluminensis
You do NOT need to poison tradescantia.
What do we need to do with it then? :)
Pull it out. That is easy. Then go over the whole area picking up any fragment of plant you can see. Then dig the topsoil and sieve it, looking for more fragments.
Then water, give it a couple of weeks and repeat the process.
You just need patience and persistence.
Ivy is worse because it is usually planted along a fence line and you can't get at the roots to dig them up. I fought a losing battle for 20 years with ivy in the last house we had.
But oxalis is the worst.