This topic may also give you some further information about the Vinaya, plants and digging 
https://discourse.suttacentral.net/t/direction-of-preemption-in-secular-law-vs-vinaya/12161
Lots of goodies, if you ‘dig’ around 
Just one thing to keep in mind. From what I understand, the Vinaya are ‘training rules’. They exist as part of a teaching framework for monastics. It doesn’t mean that they represent absolute moral principles. So choosing what to focus on, where to have right attention and right effort is important, and depends on your level of practice and circumstances