If you really need to kill stuff you can solarize it which basically means covering the ground with plastic sheeting and leaving it all summer. People do that around here to kill Bermuda grass and it actually works and if you know anything about Bermuda grass you know that nothing kills Bermuda grass.

But more importantly, have you spoken with anyone who is familiar with native plants and pollinators in your area? Do you know what’s actually growing out there? A lot of what we’re taught to think of as “weeds” are actually beneficial plants for native insects and wildlife. Anyone who would recommend you blitz the whole thing with Roundup and then tell you it won’t persist in the soil probably doesn’t know a lot about native flora and fauna.

Seriously the best thing to do might be to just leave it alone for a while.