system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: How do farmers keep poisonous plants from growing in crops and being harvested and packaged with edible plants?
gpt
The combine harvester machine actually helps take care of this. You can set the head height to be above where a lot of those are if present, and the internals of the machine are already designed to pick out the useful parts like corn kernels or grains and throw away the rest.

For stuff like strawberries etc thats usually handpicked.