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Spiny Cockleburr
Myrtle Spurge
Salt Cedar
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Russian Knapweed
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Scotch Thistle
Spotted Knapweed
Diffuse Knapweed
Canada Thistle
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Purple Starthistle
Russian Olive
Hoary Cress
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Musk Thistle
Yellow Toadflax
Leafy Spurge
Oxeye Daisy
Dalmation Toadflax
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Black Henbane

*Do not mow

*Spreads by root system

*Infests open fields, roadsides, grass and range lands

*All parts of plant are poisonous

*Milky white sap is poisonous if ingested

*Drought tolerant perennial

*If ingested by livestock it becomes poisonous

*Has toxicity to animals and humans

*Ingestion by animals may lead to humans

*Chokes native plants, robs the watertable

*Extremely difficult to remove

*Ruins bird nesting sites

*Toxic to livestock, especially Sheep

*Destructive to land

*Excretes mineral salts making it difficult for other plants to grow

*Biggest threat is loss of habitat due to wildfires

*Serious threat to dogs, wildlife and landscapes

as its seeds get stuck in fur, eyes, nose, ears, mouth

*Seeds reproduce laterally

*Pervasive root system spreads deeply (2 meters +)

*Small pieces of cut root can form new plants

*Poisonous to horses, all knapweeds contain carcinogens

*Do not let any knapweed contaminate your hay

*Releases a chemical that hinders plants root growth

*Severely reduces forage plant use and production

*Although not poisonous, livestock will refuse to enter heavy infestations and will not graze close to spines

*Chokes native plants, robs the watertable

*Extremely difficult to remove

*Ruins bird nesting sites

*May trigger an allergic reaction in some people

*Avoid if allergic to ragweed or birch pollen

*Selective herbicide is recommended for control

*Contains poisonous glucoside 

*Harmful to cattle if consumed in large quantities

*Germinate in 10 to 15 days at 55 to 60 degrees F

*Can invade undisturbed sites

*Out competes desirable native plants and grasses

*Sharp spines deter livestock grazing 

*Poisonous under certain conditions

*When consumed by livestock, its toxins attack the digestive tract, and in large amounts death may occur

*Contains alkaloids toxic to animals and humans

*Its white, latex sap can cause human blindness on contact

*Highly invasive, reduces forage plants for livestock

*Very aggressive, can quickly infest large areas

*Knapweeds should be sprayed in spring or early summer

*New Mexico's largest native member of Daisy family

*One of the most common weed wildflowers in North America

*One of the most invasive species in many western states

*Although not toxic, all knapweeds contain carcinogens

*Wear gloves when handling knapweeds

*Contains poisonous glucoside

*Harmful to livestock if consumed in large amounts

*Found on roadsides, grasslands, crop fields

*2nd most common noxious weed in western U.S.

*Reproduces via vegetative shoots

*Crowds out desirable native plants

*Landowners with it on properties are required to control it

*All parts of plant are HIGHLY TOXIC to animals and humans

*Highly invasive and will out compete native plants

*Transporting across state lines is illegal in most areas

*Spreads mostly by underground rhizomes and sprouts from root crowns

*Extremely difficult to eradicate

*Preventing initial establishment is critical as it stores large amounts of energy in its extensive root system

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