Yeah no till has that problem. That's when it's really important to do crop rotation and companion planting and stuff.... Can't do crop rotation if you don't know what was there last year though. Solarization, where you try to kill soil shit by putting a black tarp over the soil and letting it sun bake, might help, but it doesn't solve the problem of you have a lot of nice rotting organic matter in there, and some of it might have some shit that wants to eat live plants too. People doing no till on an industrial scale can do stuff like use massive machines to steam the soil. But that kind of feels like a solving one problem by creating another one kind of thing to me.

Community garden plots are cesspools, though. You find out what the real strong varieties are........