Scotch Thistle

Noxious Weeds & Invasive Plants

What are Noxious Weeds?

They are non-native species that spread aggressively.  They invade our ecosystems and out-compete local vegetation and cultivated crops for water, nutrients and light.  They do not have natural insect predators or plant pathogens to keep populations in check. 

What Does the District Do?

We have a spraying program to control and eradicate as many of these invasive plants as possible on District properties.  We ensure spraying is done before plants go to seed to prevent their spread.

What Can You Do?

 Take action as soon as you notice growth.  We are writing to you early in the season to remind property owners that treatment and control early in the season will greatly reduce the presence and spread of weeds in our community. The following are methods that are used to manage weeds:

  • Mechanical – pull, dig up, mow and plow weeds.
  • Cultural – prevent the introduction by bringing in only clean soil, buying nursery stock and seed that is native or not invasive.
  • Chemical – use the appropriate herbicides responsibly.
  • Biological – bioagents are developed for many species and are released strategically.  This is an option for sites when there is a major infestation of a specific weed, and a biocontrol is available.

The most effective time to spray Scotch Thistles is between mid-May and mid-June.

The District appreciates the cooperation of all residents in reducing and eradicating noxious weeds in our community.

Frequently Asked Questions


If you have any questions or would like to report an infestation of noxious weeds, please contact the District's Bylaw Department.