That's it.
You cut a yard full of weeds then drop the seeds off at the next yard.
I blow my mowers off after every yard
When the pigs, on my East side, moved in, the only weed I had in my front yard was large crab grass, which I dutifully dug out every summer. Did I mention that he has commercial lawn equipment? He would park in front of my house and, when he was finished mowing, he would blow all the detritus into my yard (intentionally). There is not much grass left in my front yard - mostly weeds. No surprise there.