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Posts Tagged ‘state’

Russian Olive

Tuesday, June 25, 2013 AT 06:06 PM

Elaegnus angustifolia

This tree is fast growing and reaches 10 to 25 feet tall.

Thorns on the branches are 1 to 2 inches long.

Leaves are narrow, 2 to 3 inches long, with a silvery-green color.

Flowers are yellow and arranged in clusters.

Fruits look like small silvery olives that turn brown at maturity.

Russian olive is native to Europe. It is commonly used as an ornamental or windbreak tree. It can be extremely invasive in riparian areas, out-compete desirable native plants, and restrict access to waterways by livestock, wildlife, and people. It is not of major concern in Natrona County, but is found on creek banks and the North Platte River.


Chemical control is done by method of cut stump treatment. Cut stumps must be treated chemically or the tree will continue to reproduce by shoots! Contact your local weed and pest for specific recommendations.

Purple Loosestrife

Tuesday, June 25, 2013 AT 06:06 PM

Lythrum salicaria

This perennial plant grows 6 to 8 feet tall.

Leaves are simple, lance shaped, and opposite.

Flowers are rose-purple with 5 to 7 petals arranged on vertical racemes.

The roots are rhizomatous.

Also called “purple lythrum” or “purple rocket”.

Purple loosestrife was introduced from Europe as an ornamental. It can escape into riparian areas and impede water flow and can severely impact waterfowl habitat. It is not a problem yet in Natrona County, however keep an eye out for this stuff! Pay attention to the scientific name on ornamental plants you are buying. Do not plant this!!!

Musk Thistle

Tuesday, June 25, 2013 AT 06:06 PM

Carduus nutant

This plant is a biennial growing up to 6 feet tall .

Reproduces from seeds.

Leaves are deeply lobed and spiny margined.

Flowers heads are solitary, deep rose to purple, and range from 1 1/2 to 3 inches in diameter. They are usually bent over giving them the appearance of “nodding”.

Musk thistle is native to southern Europe and western Asia. If forms dense stands along roadsides, ditch and stream banks, and disturbed areas. Much of the musk thistle in Natrona County has been decimated by biological control insects.


There are many chemical options from rosettes to bolting. Contact your local weed and pest for specific recommendations.


Rhinocyllus conicus and Trichosirocalus horridus weevils have been tremendously successful in reducing thistle populations and plant vitality.


Cut down before seed production.