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Noxious Weeds in Douglas County

Of special concern in Douglas County is diffuse knapweed which is native to degraded non-cropland and seashores from the Mediterranean. It thrives in the semi-arid west and can’t tolerate flooding or shade. Diffuse knapweed has been reported to contain chemicals that can suppress competitive plant growth. Environmental disturbances encourage its invasion. The key to management is to prevent it from going to seed. A single knapweed plant can produce 500 – 1500 seeds! Seeds are disbursed by the wind, as the plant dries, it breaks off and becomes a tumbleweed, allowing seeds to be disbursed over large areas. The dried stalks can lodge under vehicles, which spreads the seeds even further. Diffuse knapweed invades overgrazed pastures, forms dense stands and may be toxic to horses. Herbicides should be used in the spring or fall, and then the pasture area should be allowed to recuperate by not grazing for a season or longer as needed. If grasses do not return it should be re-seeded so grasses can compete with any surviving knapweed plants.

Bull Thistle
Bull Thistle
Bouncingbet
Bouncingbet
Canada Thistle
Canada Thistle
Common Tansy
Common Tansy
Common Teasel
Common teasel
Cutleaf Teasel
Cutleaf Teasel
Cypress Spurge
Cypress Spurge
dalmation toadflax
Dalmation Toadflax
diffuse knapweed
Diffuse Knapweed
Field Bindweed
Field Bindweed
Hoary Cress
Hoary Cress
Houndstongue
Houndstongue
Leafy Spurge
Leafy Spurge
Oxeye Daisy
Oxeye Daisey
Musk Thistle
Musk Thistle
Myrtle Spurge
Myrtle Spurge
Orange Hawkweed
Orange Hawkweed
Perennial Pepperweed
Perennial Pepperweed
Plumless Thistle
Plumeless Thistle
PUncture Vine
Puncturevine
Sulfur Cinquefoil
Sulfur Cinquefoil
https://www.colorado.gov/pacific/agconservation/purple-loosestrife
Purple Loosestrife
Yellow Toadflax
Yellow Toadflax
Russian Knapweed
Russian Knapweed
Dame's Rocket
Dame’s Rocket
Saltcedar
Saltcedar
Scotch Thistle
Scotch Thistle
Spotted Knapweed
Spotted Knapweed