Monthly Archives: July 2013

Invasive phenology updates: jimson weed, ground ivy, and kudzu


Jimson Weed – Datura stramonium : flowering and fruiting (look at spiny egg shaped fruit in leaf axil.


ground ivy – Glechoma hederacea – Dense infestation at disturbed forest edge and beginning to expand into the forest.


Kudzu – Pueraria montana : growing over trees

AOWCP installs billboard along the Ohio River

The Appalachian Ohio Weed Control Partnership along with Southern Indian Cooperative Invasives Management ( and River to River Cooperative Weed Management Area ( have continued working together to address invasive plant issues along the Ohio River.  Our partnership, Central Hardwoods Invasive Plant Network (CHIP-N) has partnered with the Ohio River Basin Fish Habitat Partnership and Wildlife Forever to install a billboard in Southern Ohio. We’ve had our billboard up along US 52 between Ashland, KY  and Southpoint, OH for over a month.  We should get anywhere from 800k-900k views over this time frame.  Hopefully efforts like this help people realize the importance of cleaning boating gear before traveling to another body of water.


Phenology updates: Deptford pink, Japanese barberry, garlic mustard, purple loosestrife, Queen Anne’s lace, mimosa, Chinese yam, and orange daylily

Hey AOWCP blog followers.  Uploading photos with updates of plant phenology has been one of my favorite things to post.  Unfortunately,  the main computer I am using doesn’t like loading pictures very well.  I will try harder to get to a different computer to keep loading pictures up.  Here are some highlights from the last month.


Deptford pink – Dianthus armeria : flowering


Japanese barberry – Berberis thunbergii : we used our weed wrench to pulled this guy up at a workshop


Garlic mustard – Alliaria petiolata : here are some garlic mustard basal rosettes (intermixed with some japanese stiltgrass – Microstegium vimineum).


Purple loosestrife – Lythrum salicaria : Blooming along the Ohio River.  Purple loosestrife blooms from early July to early September


Queen Anne’s lace – Daucus carota: Queen Anne sure does own a lot of lace around here.  Here is some flowering (white flowers) intermixed with some dried curly dock (Rumex cripsus).


Mimosa – Albizia julibrissin : Most have finished flowering by now, you may find a couple more still flowering the further north you are


Chinese yam – Dioscorea opposita: agressively growing, should have tiny bulbils (think of a tiny potato aboveground) forming at axis.


Orange daylilies – Hemerocallis fulva : Still flowering

Cultivating Awareness: Ornamental Plants Invading Natural Areas

MIPN has just completed a video that demonstrates the impacts of a few popular ornamental plants (common buckthorn, Japanese barberry, burning bush, and Callery pear) on natural areas in the Midwest. Please watch and share with your colleagues and neighbors.

The smart phone app mentioned in the video can be downloaded for free from the Apple store for iPhone or iPad. The Android version is coming soon.

Brush off invasive species

Cleaning equipment and personal gear is an important preventative measure to reduce the spread of invasive plants. Follow this link for an article about how Minnesota is promoting this idea.

Hopefully we can get more individuals and organizations cleaning their equipment in Ohio.

Taking Back the Yard: Dealing with Invasive Plants

There’s nothing more frustrating for gardeners than discovering that their well-planned plots or rolling lawns have been infiltrated by invasive plant species, the perennial marauders of the back yard set. While many people panic and immediately start yanking or mowing the intruders when they first make their appearance, gardening expert Karen Snetselaar, Ph.D., chair and professor of biology at Saint Joseph’s University, advises that it’s best to investigate the plant that’s choking your columbines or blighting your lawn before complicating the problem with an errant course of action.

See full article here…

Making a difference in your yard – swap out invasive common buckthorn and try a native plant instead

By RICK MEADER (MI), Thu, Jun 27, 2013 11:10 pm—trade-a-native-for-an-invasive/

Ailanthus tree’s status as invasive species offers lesson in human interaction

Researchers point to ailanthus as a prime example of the dangerous unpredictability of a non-native plant’s introduction to habitats and humans’ inadvertent aid in its spread and domination.

Knotweeds are weeds

OLYMPUS DIGITAL CAMERAThough many plant species are in bloom this time of year, you may have noticed one particularly imposing species that has seemingly taken over lowland areas, mowed hill sides, and roadways. Showy sprays of small white flowers along the branches of this plant make it easy to recognize from a distance. Not to mention that it is a robust perennial herb that grows in dense patches, often to a height of 3-12 feet. Although this plant’s name may make you think otherwise, Japanese k”not”weed is a weed!

foundationJapanese knotweed (Polygonum cuspidatum) was introduced to the United States, from Asia, in the 1800s as an ornamental plant where it had been used for erosion control and landscape screening. However, the tall, dense growth habit of this plant species drastically alters the landscape by out-competing other vegetation, which decreases available food and habitat for wildlife. It can also interfere with water drainage, degrade pastures, and cause structural damage by sprouting through nearby pavement and foundations. During the dormant season, infested areas become covered in a dense mat of dried stems that create a fire hazard.

underground rhizomes

underground rhizomes

Japanese knotweed tolerates a variety of ecological conditions but prefers wet soil in low places along streams and rivers. It aggressively spreads by rhizomatous roots and stem fragments that are transported by stream bank erosion, through mechanical treatment efforts, such as mowing, and by rhizome contaminated fill dirt.

Once established, Japanese knotweed is extremely difficult to control; so, it is important for landowners to detect new infestations early and begin treatment right away. Identification of Japanese knotweed is easy this time of year because of the showy white sprigs of small flowers. Stems are reddish, hollow, and jointed at a swollen node. The leaves are 6 inches long, broad and oval-shaped with a pointed tip. They are alternately attached to the stem, which dies back each fall, growing a new stem the next year.

Another knotweed species, giant knotweed (Polygonum sachalinense), is known to occur in our area and can hybridize with Japanese knotweed to form, Bohemian knotweed (Polygonum x bohemicum). Both giant knotweed and Bohemian knotweed are similar in appearance to Japanese knotweed.

Visit and for more information on Japanese Knotweed, giant knotweed, Bohemian knotweed, and other invasive species. You can also contact Eric Boyda of the Appalachian Ohio Weed Control Partnership by phone at 740-534-6578 or email at Article author: Aurora Roemmich

AOWCP celebrates its first birthday with technical meeting to facilitate management of hydrilla on the Ohio River

The AOWCP turned 1 year old last Wednesday June 26th. To celebrate, we thought we’d discuss the management of hydrilla on the Ohio River. We had several great speakers and many great participants, both in person and over the Internet and phone. I’m providing links to some of the powerpoints presented. However, not all are available currently because they contain unpublished data. I will post them later after the papers are published. Thank you for understanding.

Introduction – Eric Boyda, AOWCP

Ohio River Hydrilla – Dr. Michael Netherland, US Army ERDC

EPRI ORBFHP Hydrilla Workshop – Dr. Doug Dixon, EPRI

Tools for Early Detection, Hydrilla Workshop, June 2013 – Kate Howe, MIPN