| Town of Vernon, Waukesha County, State of Wisconsin Weeds Status Definitions |
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| Noxious Weeds - a class of weeds that must be destroyed. |
| Nuisance Weeds - a class of weeds that are prohibited to be cultivated or sold. |
| Restricted Weeds - a class of weeds that should be voluntarily destroyed by the landowner and not allowed to escape to neighboring lands. |
| The Weed Ordinance is designed to protect agricultural land, natural ecosystems, and public health. |
| Photograph Noxious Weed |
Genus species
Description and comments |
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| Cirsium arvense Common Name: = Canada Thistle (USDA). Family: = Asteraceae. Exotic to Wisconsin. Invasive statewide. Invasive to entire US except southeast. State Status: Noxious Weed.
Town of Vernon Status: Noxious Weed. Not abundant in Town. Desc: Pink flat topped flower head, flowers 0.5 inches wide. Plant height 2 to 4 feet tall, spiny. |
| Future image | Convolvulus arvensis Common Name: = Field Bindweed (USDA). Family: = Convolvulaceae. Exotic to Wisconsin. Invasive to south and east Wisconsin. Invasive to entire US. Wisconsin Status: Noxious Weed.
Town of Vernon Status: Noxious Weed. Not abundant in Town. Desc: Pinkish white 5-parted funnel flowers, 0.7 inches long. Herbaceous vine 3 feet long, small bracts well below flower. |
| Future image | Euphorbia esula Common Name: = Leafy Spurge (USDA). Family: = Euphorbiaceae. Exotic to Wisconsin. Invasive statewide. Invasive to entire US except southeast. Wisconsin Status: Noxious Weed.
Town of Vernon Status: Noxious Weed. Not abundant in Town. Desc: Yellow green flowers, milky white sap (skin rash). Plant height 1 to 2 feet tall, alternate leaves. |
| Photograph Nusiance Weed |
Genus species
Description and comments |
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| Future image | Lythrum salicaria Common Name: = Purple Loosestrife (USDA). Family: = Lythraceae. Exotic to Wisconsin. Invasive southern Wisconsin. Invasive to entire US except southeast. Wisconsin Status: Nuisance Weed. All Lythrum by statute, but only Lythrum salicaria is an introduced invasive plant here. Lythrum alatum is a native species.
Town of Vernon Status: Nuisance Weed. Common near shorelines and waterways in Town. Desc: Purple 6-parted spike flowers, inflorescense 8 to 16 inches. Plant height 2 to 4 feet tall, emergent forb. |
| Future image | Rosa multiflora Common Name: = Multiflora Rose (USDA). Family: = Rosaceae. Exotic to Wisconsin. Invasive southern Wisconsin. Invasive to entire US except mountain states. Wisconsin Status: Nuisance Weed.
Town of Vernon Status: Nuisance Weed. Not abundant in Town. Desc: White 5-parted flowers, flowers 1 inch wide, very prickly stem. Plant arching 5 to 10 feet wide, nasty. |
| Photograph Restricted Weed |
Genus species
Description and comments |
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Alliaria petiolata Common Name: = Garlic Mustard (USDA). Family: = Brassicsaceae. Exotic to Wisconsin. Invasive southern Wisconsin. Invasive to entire US except southern states. Wisconsin Status: No Status.
Town of Vernon Status: Restricted Weed. Abundant in woodlands in Town. Desc: Biennial forb, 24 to 36 inches tall. Triangle shaped leaves along spike topped with many small white, 4 parted, flowers. Recommended treatment: Hand pull if weed is in small number. Dispose of by burning or place in clear plastic for disposal in landfill (special DNR exemption). In large infestation, use solution of 2% Round Up. Spray in late April and again in October when native plants are dormant. Article published in Mukwonago Chief by Tom Krischan, "Local wildflowers threatened by weed" (.pdf) Article published by UW Extension, Alliaria petiolata X1081 (.pdf) |
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Ambrosia artemisiifolia Common Name: = Common Ragweed (WI), Annual Ragweed (USDA). Family: = Asteraceae. Native to Wisconsin. Invasive throughout Wisconsin. Invasive to entire US. Wisconsin Status: No Status.
Town of Vernon Status: Restricted Weed. Common in disturbed sites, new subdivisions, and old fields in Town. Desc: Annual forb, 24 to 36 inches tall. Feathery fern like leaves. Flowers in 6 inch tall inflorescence of small green bell shaped flower heads. Blooms in September. Pollen causes allergy in many people with symptoms of sneezing an watery eyes. Often blooms when goldenrod is in flower, goldenrod pollen is too heavy to be air borne. Goldenrod is not the plant causing fall allergies, it's ragweed. image 07-15-2008 Recommended Treatment: Hand pull this plant. |
| Future image | Ambrosia trifida Common Name: = Giant Ragweed (WI), Great Ragweed (USDA). Family: = Asteraceae. Native to Wisconsin. Invasive throughout Wisconsin. Invasive to entire US. Wisconsin Status: No Status.
Town of Vernon Status: Restricted Weed. Common in disturbed sites, new subdivisions, and old fields in Town. Desc: Annual forb, 3 to 6 feet tall (or taller). Leaves are palmately divided into 3 (or occasionally 5) lobes. Flowers in many 10 inch tall inflorescence of small green bell shaped flower heads. Blooms in September. Pollen causes allergy in many people with symptoms of sneezing an watery eyes. Often blooms when goldenrod is in flower, goldenrod pollen is too heavy to be air borne. Goldenrod is not the plant causing fall allergies, it's ragweed. Recommended Treatment: Hand pull this plant. |
| Epipactis helleborine Common Name: = Broadleaf Helleborine (USDA). Family: = Orchidaceae. Exotic to Wisconsin. Invasive in extreme eastern Wisconsin. Invasive to entire northeast US. Wisconsin Status: No Status.
Town of Vernon Status: Restricted Weed. New outbreak in Town. First reported in woodlands in Town by Dr. T. Krischan 2007 to WI-DNR. This is first report in Waukesha county. Desc: Perennial forb, 12 to 18 inches tall. Alternate and clasping leaves on erect stem. Dull green flower with purple veins 6 parted. Recommended Treatment: Hand pull this plant. |
| Future image | Rhamnus cathartica Common Name: = European Buckthorn (WI), Common Buckthorn (USDA). Family: = Rhamnaceae. Exotic to Wisconsin. Invasive throughout Wisconsin. Invasive to entire US, except southern states. Wisconsin Status: No Status.
Town of Vernon Status: Restricted Weed. Abundant in woodlands Town. Desc: Perennial shrub, or small tree, 3 to 20 feet tall. Leaves oval with toothed edge, dullish green. Dark, almost black, fruit eaten by birds and seeds are redistributed widely through area. |
| Photograph No Status |
Genus species
Description and comments |
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Toxicodendron radicans Common Name: = Poison Ivy (USDA). Family: = . This is a native plant and is not considered invasive in Wisconsin. Wisconsin Status: No Status. It is a noxious weed in 1 state. Town of Vernon Status: No Status. Common in woodlands in Town. |
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Carduus nutans Common Name: = Musk Thistle (WI). Nodding Plumeless Thistle (USDA). Family: = . Exotic to Wisconsin. It is a noxious weed in 25 states and is invasive in Wisconsin. Wisconsin Status: No Status. Town of Vernon Status: No Status. Common in old fields in Town. Desc: Pink nodding flower head, flowers solitary, 2-3 inches wide. Leaves deeply lobed, stems spiny and winged. Plant height 2 to 5 feet tall, spiny. Blooms July. |
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Cirsium vulgare Bull Thistle |
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Sonchus arvensis Common Name: = Sow Thistle. Family: = Asteraceae. Exotic to Wisconsin. It is a noxious weed in 14 states and is invasive in Wisconsin. Wisconsin Status: No Status. Town of Vernon Status: No Status. Common in old fields in Town. Desc: Yellow flower head, flowers clustered, 0.5 inches wide. Spiny leaves clasping stem. Plant height 1 to 2 feet tall, spiny. Blooms July. |
| Future image | Arctium minus Common Burdock |
| Future image | Daucus carota Wild Carrot, Queen Anne's Lace |
| Future image | Pastinaca sativa Wild Parsnip |
| Future image | Abutilion theophrasti Velvetleaf. Annual. |
| Future image | Lonicera morrowii Morrow Honeysuckle |
| Future image | Lonicera tatarica Tartarian Honeysuckle |
| Future image | Lonicera x bella Bell Honeysuckle |
| Future image | Polygonatum cuspidatum Japanese Knotweed |
| Future image | Sorghum halepense Johnson Grass. Potentially invasive |
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| Frequently Asked Questions / Weed Removal Information (click on link). |
| Town of Vernon Weed Ordinance (click on link). |
| Neighboring Area / Other Weed Commissioners (click on link). |
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