In order for someone to mow over it, it would need to be in a field or lawn, and someone might pull it if it's in a garden. If this is true, then someone saw it and our job is done.

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Operation: Marijuana for the Masses. Here's your assignment Soldier of Fortune; you will germinate any and all schwag seeds which are viable for plantation. You will then randomly plant all germinated seeds before development into seedling throughout your home town in public places which hold a viable environment for growing. You will leave and never look back. Briefing over.