Home owners in Calgary are required to control the growth of noxious weeds and must destroy any prohibited noxious weeds on their property as regulated by the Weed Control Act. Below is a list of the common noxious and prohibited weeds in Calgary with links to more information and how to control. Blueweed Canada Thistle Common Tansy Leafy Spurge Nodding Thistle Lythraceae Scentless Chamomile Spotted …