Did you know some that control of some weeds is required by state law? Whatcom County publishes a list of non-native, invasive plants here, along with landowner responsibilities. The 2019 list was just released: https://www.whatcomcounty.us/DocumentCenter/View/39112/CountyList19
It’s critical to consult an expert on weeds, especially because some weeds are harmful to humans and animals.
Even the seemingly innocent and bright purple milk thistle can cause nitrate poisoning in grazing livestock. It’s considered a Class A weed, and landlords are required to eradicate it.