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What is a
Noxious Weed?

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Any plant designated by Federal, State or County government as injurious to public health, agriculture, recreation, wildlife or property.

Types and Classifications of Noxious Weeds

Outbreak Map

Find Noxious weed outbreaks in your area

Report an Outbreak
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Noxious weeds pose unique dangers

Explore the categories below to learn more about the types of weed that could affect you most.

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dead cheatgrass with no leaves and spikey brown florets on a black background

cheatgrass-dryfloret

Dead cheatgrass turns fully brown or tan; the florets are now very dry and spikey. At this point, it can injure livestock and horses if consumed.

close up on mature cheatgrass florets on black background

cheatgrass-maturefloret

Another example of cheatgrass florets beginning to turn purple.

Close up of cheatgrass florets

cheatgrass-florets2

Young cheatgrass florets; at this point they may be safe and palatable for livestock.

Close up of cheatgrass florets with purple tips

cheatgrass-florets

Tips and stems of florests begin to turn purple as the plant matures.

Mature cheatgrass turns purple or dark brown

cheatgrass-mature

At the end of its life cycle, cheatgrass plant has turned brownish-red and is no longer good forage.

Close up of dead cheatgrass florets; dry, yellow, opened up into spikes

cheatgrass-deadflorets

Fully dead cheatgrass florets can injure the throats and digestive tracts of animals

close up of red cheatgrass stems with visible ligule and green leaf blade

cheatgrass-stem

Cheatgrass stems begin to turn red as the plant matures, note the thin white collar-like ligule at the base of the leaf blade.

Close up on the stems of a cheatgrass patch showing red bands around the joints and some yellowing vegetation

cheatgrass-stems

A community of cheatgrass stems; it is not uncommon for some of the foliage to turn yellow prematurely, especially during dry times.

Close up of cheatgrass leaf blade emerging from leaf sheath

cheatgrass-leaf

The leaf blade emerges from the sheath, which reaches up from the base of the plant.

Cheatgrass clump grown in a pot, foliage without flowers

cheatgrass-immature

Immature, non-reproductive cheatgrass foliage; the foliage is soft and palatable, and no florets have emerged.

A close-up view shows a purple flower with long, thin, spiky petals radiating outward from a densely packed center. Each petal is tipped with white pollen, and the vibrant coloration stands out sharply against the solid black background. The lighting emphasizes the intricate structure and texture of the flower, making the details of its form clearly visible.
A close-up view shows a thistle flower with vibrant purple petals radiating outward in a brush-like pattern. The base of the flower is green, with fine hairs visible along its surface. The petals are thin and elongated, creating a dense, textured bloom that stands out sharply against the solid black background. Lighting highlights the intricate structure and surface details of both the flower and its base.
A group of tall deciduous trees with green foliage stands on a well-maintained grassy lawn. Behind them, a beige building with multiple windows is visible, along with a row of parked vehicles including cars and trucks. The sky is mostly clear with a few scattered clouds, and the setting appears to be in an urban or suburban area, possibly near a commercial or residential structure. The scene combines natural and built elements, with the trees providing shade and visual contrast against the architecture.
Yellow Siberian elm leaves abundant on a thin branch
Close-up on the trunk of a living Siverian elm to show the bark's deeply grooved texture and dark grey color
Specimen view of Siberian elm seeds, showing flat round shape, yellow to light green color, and brown tip, papery texture
20-30ft tall elm planted over a bench along a sidewalk
A mature Siberian elm, at least 60ft tall, towers over a residential entryway amidst a paved road and two single-story structures
Image of Siberian elm canopy branches growing through power lines and creating a hazardous situation in case of sparks or falling branches
Siberian elms sprouting around a single-story home in a dry grass prairie
Siberian elm leaves growing alternate on a reddish stem
Siberian elm growing as a large shrub in dryland
A close-up view shows a purple flower with long, thin, spiky petals radiating outward from a densely packed center. Each petal is tipped with white pollen, and the vibrant coloration stands out sharply against the solid black background. The lighting emphasizes the intricate structure and texture of the flower, making the details of its form clearly visible.

Acroptilon repens

A close-up view shows a thistle flower with vibrant purple petals radiating outward in a brush-like pattern. The base of the flower is green, with fine hairs visible along its surface. The petals are thin and elongated, creating a dense, textured bloom that stands out sharply against the solid black background. Lighting highlights the intricate structure and surface details of both the flower and its base.

Acroptilon repens

A group of tall deciduous trees with green foliage stands on a well-maintained grassy lawn. Behind them, a beige building with multiple windows is visible, along with a row of parked vehicles including cars and trucks. The sky is mostly clear with a few scattered clouds, and the setting appears to be in an urban or suburban area, possibly near a commercial or residential structure. The scene combines natural and built elements, with the trees providing shade and visual contrast against the architecture.

siberianelm-mature

Mature Siberian elms grow up to 70ft tall and are commonly planted as shade trees in urban settings.

Yellow Siberian elm leaves abundant on a thin branch

siberianelm-yellowleaves

Siberian elm leaves turn yellow in the fall

Close-up on the trunk of a living Siverian elm to show the bark's deeply grooved texture and dark grey color

siberianelm-bark

The bark of Siberian elm is dark grey, deeply grooved with a rough texture, especially as it ages. Younger trees may have a more uniform texture composed of interlocking narrow plates.

Specimen view of Siberian elm seeds, showing flat round shape, yellow to light green color, and brown tip, papery texture

siberianelm-seeds

Siberian elm seeds are flat, small, and round- or oval-shaped; the main seed is surrounded by a thin papery wing, slightly translucent and light green to yellow or tan; distinctive brown tip

20-30ft tall elm planted over a bench along a sidewalk

siberianelm-adult

Siberian elms are often intentionally planted as shade along walkways

A mature Siberian elm, at least 60ft tall, towers over a residential entryway amidst a paved road and two single-story structures

siberianelm-ornamental

Siberian elms were promoted as hardy ornamentals by the US Forest Service

Image of Siberian elm canopy branches growing through power lines and creating a hazardous situation in case of sparks or falling branches

siberianelm-hazard

This Siberian elm growing into power infrastructure creates an electrical hazard if the branches were to collapse or catch fire

Siberian elms sprouting around a single-story home in a dry grass prairie

siberianelm-windbreak

Siberian elms were promoted by the federal government as windbreak to prevent soil erosion

Siberian elm leaves growing alternate on a reddish stem

siberianelm-leaves2

Young stems and buds can sometimes have a reddish appearance

Siberian elm growing as a large shrub in dryland

siberianelm- dryland

Under dry conditions, Siberian elm is likely to remain a large shrub. In this image, you can see how some of the limbs may be able to outgrow the others, which may form the primary trunk for a Siberian elm tree at some point

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A close-up view shows a purple flower with long, thin, spiky petals radiating outward from a densely packed center. Each petal is tipped with white pollen, and the vibrant coloration stands out sharply against the solid black background. The lighting emphasizes the intricate structure and texture of the flower, making the details of its form clearly visible.
A close-up view shows a thistle flower with vibrant purple petals radiating outward in a brush-like pattern. The base of the flower is green, with fine hairs visible along its surface. The petals are thin and elongated, creating a dense, textured bloom that stands out sharply against the solid black background. Lighting highlights the intricate structure and surface details of both the flower and its base.
A group of tall deciduous trees with green foliage stands on a well-maintained grassy lawn. Behind them, a beige building with multiple windows is visible, along with a row of parked vehicles including cars and trucks. The sky is mostly clear with a few scattered clouds, and the setting appears to be in an urban or suburban area, possibly near a commercial or residential structure. The scene combines natural and built elements, with the trees providing shade and visual contrast against the architecture.
Yellow Siberian elm leaves abundant on a thin branch
Close-up on the trunk of a living Siverian elm to show the bark's deeply grooved texture and dark grey color
Specimen view of Siberian elm seeds, showing flat round shape, yellow to light green color, and brown tip, papery texture
20-30ft tall elm planted over a bench along a sidewalk
A mature Siberian elm, at least 60ft tall, towers over a residential entryway amidst a paved road and two single-story structures
Image of Siberian elm canopy branches growing through power lines and creating a hazardous situation in case of sparks or falling branches
Siberian elms sprouting around a single-story home in a dry grass prairie
Siberian elm leaves growing alternate on a reddish stem
Siberian elm growing as a large shrub in dryland
A close-up view shows a purple flower with long, thin, spiky petals radiating outward from a densely packed center. Each petal is tipped with white pollen, and the vibrant coloration stands out sharply against the solid black background. The lighting emphasizes the intricate structure and texture of the flower, making the details of its form clearly visible.

Acroptilon repens

A close-up view shows a thistle flower with vibrant purple petals radiating outward in a brush-like pattern. The base of the flower is green, with fine hairs visible along its surface. The petals are thin and elongated, creating a dense, textured bloom that stands out sharply against the solid black background. Lighting highlights the intricate structure and surface details of both the flower and its base.

Acroptilon repens

A group of tall deciduous trees with green foliage stands on a well-maintained grassy lawn. Behind them, a beige building with multiple windows is visible, along with a row of parked vehicles including cars and trucks. The sky is mostly clear with a few scattered clouds, and the setting appears to be in an urban or suburban area, possibly near a commercial or residential structure. The scene combines natural and built elements, with the trees providing shade and visual contrast against the architecture.

siberianelm-mature

Mature Siberian elms grow up to 70ft tall and are commonly planted as shade trees in urban settings.

Yellow Siberian elm leaves abundant on a thin branch

siberianelm-yellowleaves

Siberian elm leaves turn yellow in the fall

Close-up on the trunk of a living Siverian elm to show the bark's deeply grooved texture and dark grey color

siberianelm-bark

The bark of Siberian elm is dark grey, deeply grooved with a rough texture, especially as it ages. Younger trees may have a more uniform texture composed of interlocking narrow plates.

Specimen view of Siberian elm seeds, showing flat round shape, yellow to light green color, and brown tip, papery texture

siberianelm-seeds

Siberian elm seeds are flat, small, and round- or oval-shaped; the main seed is surrounded by a thin papery wing, slightly translucent and light green to yellow or tan; distinctive brown tip

20-30ft tall elm planted over a bench along a sidewalk

siberianelm-adult

Siberian elms are often intentionally planted as shade along walkways

A mature Siberian elm, at least 60ft tall, towers over a residential entryway amidst a paved road and two single-story structures

siberianelm-ornamental

Siberian elms were promoted as hardy ornamentals by the US Forest Service

Image of Siberian elm canopy branches growing through power lines and creating a hazardous situation in case of sparks or falling branches

siberianelm-hazard

This Siberian elm growing into power infrastructure creates an electrical hazard if the branches were to collapse or catch fire

Siberian elms sprouting around a single-story home in a dry grass prairie

siberianelm-windbreak

Siberian elms were promoted by the federal government as windbreak to prevent soil erosion

Siberian elm leaves growing alternate on a reddish stem

siberianelm-leaves2

Young stems and buds can sometimes have a reddish appearance

Siberian elm growing as a large shrub in dryland

siberianelm- dryland

Under dry conditions, Siberian elm is likely to remain a large shrub. In this image, you can see how some of the limbs may be able to outgrow the others, which may form the primary trunk for a Siberian elm tree at some point