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Ornamental invasive plants

Many ornamental invasive plants may be found in your flower beds or garden. These flowers were listed as invasive plants due to their abilities to spread rapidly, often escaping garden boundaries. They can outgrow native species resulting in an impact on natural environments. They were added to the noxious and prohibited noxious weed lists under theAlberta Weed Control Act in 2010.

Ornamental Weeds
Common Ornamental Noxious Weeds:
  • Dame's Rocket (Hesperis matronalis)
  • Creeping Bellflower (Campanula rapunculoides)
  • Yellow Clematis (Clematis tangutica)
  • Common Baby's Breath (Gypsophila paniculata) 
  • Oxeye Daisy (Leucanthemum vulgare)
Common Ornamental Prohibited Noxious Weeds:
  • Himalayan Balsam (Impatiens glandulifera)
  • Salt Cedar (Tamarix spp.)
  • St. John's Wort (Hypericum perforatum)
  • Purple Loosestrife (Lythrum salicaria

Ornamental Weeds

Good Gardening Solutions

  • Learn the characteristics and spreading habits of the plants you wish to grow
  • Avoid all plants with known invasive behaviours (even if they are not listed on the Weed Control Act) such as goatweed (Aegopodium podagraria)
  • Read plant tags or catalogues – avoid plants with characteristics like ‘vigorous’ or ‘self sows easily’
  • Remove noxious plants as soon as possible even if they don’t look like they are spreading in your garden; their seeds can travel far distances and start an infestation at any time
  • Visit the  for great plant alternatives to noxious weeds 

Avoid Wildflower Mixes

Wildflower mixes often contain invasive plant species that spread rapidly and are not from the local area. Check the label for the scientific names to know exactly what you are planting in your garden and flower beds. Avoid purchasing seed mixes that do not include the scientific names on the label. If you would like to plant wildflowers, it is best to research native wildflower species, common to your area, and plant individual flowers or purchase seed mixes from local reputable growers. 

Further information:

Transportation and Agriculture Services
Phone: 780-417-7100
Email: transportationandagriculture@strathcona.ca

Last updated: Wednesday, February 19, 2014
Page ID: 38845