If they just don’t spray it every year, it should be fine in a year or so.

Anything quicker is likely to be orders of magnitude more difficult to pull off, and have unexpected side effects.

Glyphosate has no effect on plants once it gets into the soil. It has to actually be sprayed on the _leaves_ to act.

There is some flimsy evidence that it might affect insects (as in: we drenched the insects in it, and noticed some effect).

And finally, it'll be completely gone within a year or so. Its half-life is around 50 days.