As of tomorrow, Marsh thistle (Cirsium palustre) will officially be on Washington's Noxious Weed List. It will be a class A weed, which means it is required for eradication whenever found.
For more information:
https://www.nwcb.wa.gov/weeds/marsh-thistle
#botany #invasivespecies #thistle #WashingtonState #pnw