NOXIOUS WEEDS

What are noxious weeds?

Not your typical garden weed, noxious weeds can proliferate in such abundance or be so difficult to control that they negatively impact agriculture and crowd out native plants.  Legally, a noxious weed is any plant designated by a Federal, State or county government as injurious to public health, agriculture, recreation, wildlife or property. (Sheley, Petroff, and Borman,1999)

All landowners are required to control noxious weeds on their property to prevent these weeds from blooming or coming to maturity.  The Pottawattamie County weed commissioner enforces the Iowa Noxious Weed Law. https://www.legis.iowa.gov/docs/code/317.pdf

 

Listed Noxious Weeds

 

Including all species of thistles belonging to the genera of Cirsium and Carduus.

 

Primary Noxious Weeds:

 

  • QUACK GRASS

  • PERENNIAL SOW THISTLE

  • CANADA THISTLE

  • FIELD BINDWEED

  • HORSE NETTLE

  • LEAFY SPURGE

  • PERENNIAL PEPPER-GRASS

  • RUSSIAN KNAPWEED

  • BUCKTHORN

  • MUSK THISTLE

  • TALL THISTLE

 

Secondary Noxious Weeds:

  • BUTTERPRINT ANNUAL (Velvet Leaf)

  • COCKLEBUR ANNUAL

  • WILD MUSTARD ANNUAL

  • WILD CARROT BIENNIAL

  • BUCKHORN PERENNIAL

  • SHEEP SORREL PERENNIAL

  • SOUR DOCK PERENNIAL

  • POISON HEMLOCK

  • MULTIFLORA ROSE

  • WILD SUNFLOWER ANNUAL

  • PUNCTURE VINE ANNUAL

  • TEASEL BIENNIAL

  • SHATTERCANE ANNUAL

 

Invasive plants:

Invasive plants are exotic weeds that are not native to Pottawattamie County and typically have no natural enemies to limit their reproduction and spread.  These invasives can produce significant changes to the functioning of ecosystems. The following invasive plants are prohibited from the import, sale, or distribution in any form:

  • Teasel (Dipsacus) biennial.

  • Multiflora rose (Rosa multiflora).

  • Purple loosestrife (Lythrum salicaria).

  • Purple loosestrife (Lythrum virgatum).

  • Garlic mustard (Alliaria petiolata).

  • Oriental bittersweet (Celastrus orbiculatus).

  • Japanese knotweed (Fallopia japonica).

  • Japanese hop (Humulus japonicus).

 

Other invasive species of concern are:

  • Palmer Amaranth

  • Honeysuckle

  • Tree of Heaven

 

For more information on identification and management:

 

Iowa State University Extension

http://www.weeds.iastate.edu/reference/noxiousimages.shtml#

Iowa DNR

http://www.iowadnr.gov/Conservation/Forestry/Forest-Health/Invasive-Plants

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