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Knox County Soil and Water Conservation District

Invasive Species of the Months

  • June 2016: Poison Hemlock (Conium maculatum)
  • July 2016: Common Teasel (Dipsacus fullonum)
  • August 2016: Common Reed (Phragmites australis)
  • September 2016: Sweet Autumn Clematis (Clematis terniflora)
  • October 2016: Japanese Stiltgrass (Microstegium vimineum)
  • November 2016: Burning Bush (Euonymus alatus)
  • December 2016: Wintercreeper (Euonymus fortunei)
  • January 2017: Tree of Heaven (Ailanthus altissima)
  • February 2017: Garlic Mustard (Alliaria petiolata)
  • March 2017: Callery Pear (Pyrus calleryana)
  • April 2017: Periwinkle (Vinca minor)
  • May 2017: Multiflora Rose (Rosa multiflora)
  • June 2017: Wild Parsnip (Pastinaca sativa)
  • July 2017: Japanese Knotweed (Fallopia japonica)
  • August 2017: Japanese Hops (Humulus japonicus)
  • September 2017: Beefsteak Plant (Perilla frutescens)
  • October 2017: Chinese Silver Grass (Miscanthus sinensis)
  • November 2017: Oriental Bittersweet (Celastrus orbiculatus)
  • December 2017: English Ivy (Hedera helix)
  • January 2018: Japanese Honeysuckle (Lonicera japonica)
  • February 2018: Star-of-Bethlehem (Ornithogalum umbellatum)
  • March 2018: Border Privet (Ligustrum obtusifolium)
  • April 2018: Bull Thistle (Cirsium vulgare)
  • May 2018: Ground Ivy (Glechoma hederacea)
  • June 2018: Moneywort (Lysimachia nummularia)
  • July 2018: Mimosa (Albizia julibrissin)
  • August 2018: Norway Maple (Acer platanoides)
  • September 2018: Ravenna Grass (Saccharum ravennae)
  • October 2018: Amur Honeysuckle (Lonicera maackii)
  • November 2018: Japanese Barberry (Berberis thunbergii)
  • December 2018: Japanese Chaff Flower (Achyranthes japonica)
  • January 2019: Yellow Groove Bamboo (Phyllostachys aureosulcata)
  • February 2019: Siberian Elm (Ulmus pumila)
  • March 2019: Autumn Olive (Elaeagnus umbellata)
  • April 2019: Musk Thistle (Carduus nutans)
  • May/June 2019: White Mulberry (Morus alba)
  • July 2019: Japanese Hedge Parsley (Torilis japonica)
  • August 2019: Kudzu (Pueraria montana)
  • September 2019: Bicolor Lespedeza (Lespedeza bicolor)
  • Oriental Lady's Thumb
    October 2019: Oriental Lady's Thumb (Persicaria longiseta)
  • Princess Tree
    November 2019: Princess Tree (Paulownia tomentosa)
  • December 2019: Jetbead (Rhodotyphos scandens)
  • January 2020: Reed Canary Grass (Phalaris arundinacea)
  • February 2020: Lesser Celandine (Ficaria verna)
  • August 2021: Chinese Yam (Dioscorea polystachya)
  • September 2022: Small Carpetgrass (Arthraxon hispidus)

Here’s an archive of our Invasive Species of the Month series:

  • June 2016 – Poison Hemlock
  • July 2016 – Common Teasel
  • August 2016 – Common Reed
  • September 2016 – Sweet Autumn Clematis
  • October 2016 – Japanese Stiltgrass
  • November 2016 – Burning Bush
  • December 2016 – Wintercreeper
  • January 2017 – Tree of Heaven
  • February 2017 – Garlic Mustard
  • March 2017 – Callery Pear
  • April 2017 – Periwinkle
  • May 2017 – Multiflora Rose
  • June 2017 – Wild Parsnip
  • July 2017 – Japanese Knotweed
  • August 2017 – Japanese Hops
  • September 2017 – Beefsteak Plant
  • October 2017 – Chinese Silver Grass
  • November 2017 – Oriental Bittersweet
  • December 2017 – English Ivy
  • January 2018 – Japanese Honeysuckle
  • February 2018 – Star-of-Bethlehem
  • March 2018 – Border Privet
  • April 2018 – Bull Thistle
  • May 2018 – Ground Ivy
  • June 2018 – Moneywort
  • July 2018 – Mimosa
  • August 2018 – Norway Maple
  • September 2018 – Ravenna Grass
  • October 2018 – Amur Honeysuckle
  • November 2018 – Japanese Barberry
  • December 2018 – Japanese Chaff Flower
  • January 2019 – Yellow Groove Bamboo
  • February 2019 – Siberian Elm
  • March 2019 – Autumn Olive
  • April 2019 – Musk Thistle
  • May/June 2019 – White Mulberry
  • July 2019 – Japanese Hedge Parsley
  • August 2019 – Kudzu
  • September 2019 – Bicolor Lespedeza
  • October 2019 – Oriental Lady’s Thumb
  • November 2019 – Princess Tree
  • December 2019 – Jetbead
  • January 2020 – Reed Canary Grass
  • February 2020 – Lesser Celandine
  • August 2021 – Chinese Yam
  • September 2022 – Small Carpetgrass

Back to CISMA Homepage.

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March 2023
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