In article ,
Nehmo wrote:

I realize the ordinances use the word “noxious”, but the word means
harmful. Harmful to what? And which plants are the ordinances
referring to? Actually, there is no list of noxious plants, and
“noxious” isn’t defined legally. It’s just a word the writers of the
ordinances thought sounded good. Thus, there is yet another reason
for the repeal of these laws. They are vague, perhaps
unconstitutionally vague.

Relevant jurisdictions will have a "noxious weeds list", which you can
probably find on your ministry or department of agriculture's web site.
Noxious weeds are ones that are a problem for farmers because they are
hard to control and spread easily. It's in the interest of
farmers (and thus everybody who eats food) that everyone prevent these
weeds from flourishing on their property.

Btw, most of the plants on noxious weeds lists are non-native.