The Alberta Weed Control Act contains a list of 46 Prohibited Noxious weeds and 29 Noxious weeds. Although the Act outlines 75 designated weed species, Greenview does not have them all! Below, we have outlined some of Greenview’s Most Wanted.

If you notice any of the mentioned species or think you may have discovered a newly introduced species in our area, please give us a call at 780-524-7621, and we would be happy to assist with identification and/or control options.

Marsh Thistle (Cirsium palustre (L.) Scop)

Marsh Thistle is the newest species found within Greenview. It can grow up to 3 meters tall and quickly overtake openings within forested areas. Under the Weed Control Act, Marsh Thistle is designated as prohibited noxious, meaning all parts of the plant must be destroyed. For information on how to control this plant, please call us at 780-524-7621.

Spotted Knapweed (Centaurea stoebe L. ssp)

Greenview has a few isolated areas where Spotted Knapweed has been confirmed. This self-pollinating plant can produce over 140,000 seeds and can be difficult to control established infestations. Under the Weed Control Act, Spotted Knapweed is designated as prohibited noxious, meaning all parts of the plant must be destroyed. For information on how to control this plant, please call us at 780-524-7621.

Pale-Yellow Iris (Iris pseudacorus L)

Greenview currently has one confirmed site of Pale-Yellow Iris, which has undergone a trial control with direction from the Provincial specialist. Occasionally Greenview sees private sales of this plant, but selling a regulated plant is illegal. This beautiful showy plant reproduces by seed and root, allowing it to quickly outcompete native vegetation and causing undesired consequences within natural wetland areas. Under the Weed Control Act, Pale Yellow Iris is designated as prohibited noxious, meaning all parts of the plant must be destroyed. For information on how to control this plant, please call us at 780-524-7621.

Himalayan Balsam (Impatiens glandulifera)

Greenview has a few confirmed sites of Himalayan Balsam, and we are attempting to work with the landowners to control these infestations. This beautiful plant may look pretty, but she only looks that way. A prolific seed producer and an impressive seasonal growth rate, this plant quickly outcompetes native vegetation in riparian areas. Under the Weed Control Act, Himalayan Balsam is designated as prohibited noxious, meaning all parts of the plant must be destroyed. For information on how to control this plant, please call us at 780-524-7621.

Scentless Chamomile (Tripleurospermum inodorum (L.) Sch. Bip.)

Greenview has pockets of Scentless Chamomile scattered throughout the municipality. This is an early flowering plant and one of the first things Greenview staff looks for in the spring. Scentless Chamomile loves to grow in disturbed areas and can produce up to 1 million seeds per plant, which stay viable in the soil for 25-plus years. Under the Weed Control Act, Scentless Chamomile is designated as noxious, meaning the plant must be kept from setting seed. For information on how to control this plant, please call us at 780-524-7621.

Tall Buttercup (Ranunculus acris L.)

Greenview has pockets of Tall Buttercup scattered throughout the municipality. This is an early flowering plant and one of the first things Greenview staff looks for in the spring. Tall Buttercup is persistent in pasture and hay lands due to its inability to persist under cultivation. Greenview recognizes that it is one of our most widespread invasive weeds and has programs in place to assist producers with its control. Under the Weed Control Act, Tall Buttercup is designated as noxious, meaning the plant must be kept from setting seed. For information on how to control this plant, please call us at 780-524-7621.

Yellow Toadflax (Linaria vulgaris Mill.)

Greenview has a few isolated patches of Yellow Toadflax, and we are working towards control. This plant reproduces by seed and roots, quickly colonizing an area and crowding out other desired vegetation. Under the Weed Control Act, Yellow Toadflax is designated as noxious, meaning the plant must be kept from setting seed. For information on how to control this plant, please call us at 780-524-7621.

Common Tansy (Tanacetum vulgare L)

Greenview has pockets of Common Tansy, and we are working towards control. This plant reproduces by seed and roots and can form dense stands crowding out other desired vegetation. Seeds from this plant will drop from the plant in the winter, allowing it to move with the water allowing it to colonize new areas. Under the Weed Control Act, Common Tansy is designated as noxious, meaning the plant must be kept from setting seed. For information on how to control this plant, please call us at 780-524-7621.

Common Mullein (Verbascum thapsus L)

Greenview has very few patches confirmed to have Common Mullein. This plant is a high seed producer at up to 240,000 seeds per plant, which remain viable in the soil for more than 100 years. Infestations can overtake and displace native vegetation. Under the Weed Control Act, Common Mullein is designated as noxious, meaning the plant must be kept from setting seed. For information on how to control this plant, please call us at 780-524-7621.

Dame’s Rocket (Hesperis matronalis L)

Greenview has very few patches confirmed to have Dame’s Rocket. This plant is a high seed producer but easy to control with repeated in-season picking over multiple years. Infestations can overtake and displace native vegetation. Under the Weed Control Act, Dame’s Rocket is designated as noxious, meaning the plant must be kept from setting seed. For information on how to control this plant, please call us at 780-524-7621.

Oxeye Daisy (Leucanthemum vulgare Lam)

Oxeye Daisy can be found in patches throughout Greenview. It is primarily found along roadsides and in pasture and hay stands. Often, we see areas where landowners may have planted Shasta Daisy, which is a hybrid of Oxeye Daisy and English Daisy, and over time, reverted to its invasive tendencies. Under the Weed Control Act, Oxeye Daisy is designated as noxious, meaning the plant must be kept from setting seed. For information on how to control this plant, please call us at 780-524-7621.

White Cockle (Silene latifolia Poir. ssp. alba (Miller) Greuter & Burdet)

Greenview has very few patches confirmed to have White Cockle. Primarily found in hay stands. White Cockle has a look-a-like called Night-Flowering Catchfly, which is sticky to the touch, whereas White Cockle is not sticky. Under the Weed Control Act, White Cockle is designated as noxious, meaning the plant must be kept from setting seed. For information on how to control this plant, please call us at 780-524-7621.

Burdock (lesser, greater, and woolly), (Arctium minus (Hill) Bernh, Arctium lappa L., Arctium tomentosum Mill)

Greenview has a few areas confirmed to have Burdock and is working towards control. This plant reproduces only by seed and can move on the fur of animals. Fun fact: Burdock seeds were the inspiration for the invention of Velcro due to their hooked seeds. Under the Weed Control Act, Burdock (Lesser, Greater, and Woolly) is designated as noxious, meaning the plant must be kept from setting seed. For information on how to control this plant, please call us at 780-524-7621.

Creeping Bellflower (Campanula rapunculoides L)

Creeping Bellflower has been known as a gardener’s worst nightmare. We often see this plant overtaking gardens, spreading primarily by its root system. Control is lengthy due to small pieces of the root being able to produce new plants. Under the Weed Control Act, Creeping Bellflower is designated as noxious, meaning the plant must be kept from setting seed. For information on how to control this plant, please call us at 780-524-7621.

Wild Caraway (Carum carvi L)

Greenview has taken steps to elevate Wild Caraway to Noxious through by-laws under the Weed Control Act and must be kept from setting seed. This is the same caraway used in spices for cooking, which has escaped cultivation and can be difficult to control. Greenview has a few confirmed infestations and is taking steps to control them. For information on how to control this plant, please call us at 780-524-7621.

Kochia (Bassia scoparia)

Greenview has taken steps to elevate Kochia to Noxious through a by-law under the Weed Control Act and must be kept from setting seed. For information on how to control this plant, please call us at 780-524-7621.

Bull Thistle (Cirsium vulgare)

Greenview has taken steps to elevate Bull Thistle to Noxious through a by-law under the Weed Control Act and must be kept from setting seed. For information on how to control this plant, please call us at 780-524-7621.