The largest natural, undeveloped area in Arlington or Lexington, AGM includes extensive wetlands, upland forests, grasslands, vernal pools, and other natural communities. Unless pulled or re-sprayed, knotweed re-growth will likely overtake the daylilies. This section has remained largely knotweed-free for the last two years. You can take organic weed-control measures to deal with Japanese knotweed to some degree (such as choking it out with tarps), but you have a better chance of getting rid of this menace if you compromise and supplement such efforts with the occasional use of an herbicide. Ideally landscaping provides not only aesthetic improvements, but protects and restores the existing systems that sustain us. It has hollow stalks that are persistent through the winter and look similar to bamboo. Along highways and bike paths, human activities substitute for flooding as mowing and other maintenance activities can spread rhizome fragments along the corridor. All vegetative waste, including both knotweed canes and root masses, has been disposed of in compost piles on-site, eliminating the possibility of infesting new sites. The main advantage of this form of control is that, once recognised, an effective natural enemy provides control of the pest indefinitely, without further cost or intervention. MassDOT, which manages thousands of miles of roadsides, much of which is heavily infested with invasive plants, does not use volunteers or have sufficient resources for long-term, intensive maintenance. Once control was underway, the project managers realized that restoration of Exit 14 would be necessary to repair the site and help with continued control of the knotweed. In wetlands, only apply herbicides registered for use in those areas. Identification/Habitat Japanese knotweed is a dense growing shrub reaching heights of 10 feet and looks like a bamboo. The “Cut, Cut, Cut” method, which requires less exhausting up-front work but more continuous effort over the years, has offered better promise. For larger populations, cut the plants in late June or early July, and then treat the re-growth with a foliar spray of a systemic herbicide in late August or early September. Managing knotweed requires both on-site control as well as taking steps to prevent spreading it to new locations. Non-essential cookies are also used to … For communities that rely on fishing for tourism and income, knotweed infestations along waterways can result in economic loss by reducing fish populations. Once uncovered, a mix of wild meadow grasses was sown to stabilize the soil. The knotweed created a barrier that was approximately 6-8 feet high and virtually impenetrable. The loss of leaf litter and woody debris results in a loss of shelter for fish and invertebrates. The 2004 East Fork Knotweed Control Project: Results Data, May 2005. We certainly can’t address all invasive plant populations in this way, nor, given the persistence of invasive plants, can we necessarily expect these designed landscapes to last any longer than a garden once the maintenance stops. Japanese knotweed is legally prohibited in Michigan. While a third year of treatment would have provided better control prior to restoration planting, MassDOT was limited by the contract schedule. As of August 2011, the switchgrass is establishing well. It grows in dense patches to heights of 10 feet, on sites ranging from strip mine spoil to shaded streambanks. You can reduce the volume you need to dispose of by burning the weed. In 2011, knotweed was again pulled and spot-treated in the spring. Managing Japanese Knotweed Japanese knotweed (Polygonum cuspidatum) is an imposing herbaceous perennial that is commonly called 'bamboo'. While the organizations behind the projects and their means and methods are considerably different, ultimately, it is the similarities which make the efforts so far successful: sustaining long-term management (requires one or more dedicated individuals); staying within the limits of the resources available by focusing on small areas; and incorporating restoration as part of the control. The disturbance of flooding causes rhizome fragments to break away from the banks and wash downstream where they create new colonies. In the spring of 2009, the dead knotweed canes were cleared, and the site was planted with one-gallon pots containing two varieties of switchgrass, ‘Shenandoah’ and the straight species, and daylilies along the edge. Control of invasive plants in wetlands is subject to the Massachusetts Wetlands Protection Act; check with the local conservation commission before implementing control measures. Here the strategy is to encourage a sense of shared responsibility on the local level where a community participates in the removal of knotweed and managing the landscape over the long-term. The stems have a fine white coating that rubs off easily. Observation in the year following treatment found that most of the small, isolated clumps of knotweed in planting beds were eradicated. This perennial herb grows up to 10 feet tall, with heart-shaped leaves and white flowers. Knotweed at Exit 14 prior to treatment – May 2007. After initial treatment, project managers realized that stem size on re-growth is not large enough for injection – the stem must be at least ½ inch in diameter – and therefore follow-up treatments require foliar application. Eco-Answers from the Pros: Recommendations for Conifer Screening. The goal is not one of food production or aesthetics alone, but to provide a more stable plant community that protects wildlife, waterways, and human infrastructure. Be forewarned that this is a multi-year project (but the results will be worth it). The second, known as “Cut, Cut and Pull” or “Cut, Cut, Cut,” has involved repeated cutting of the growing stalks during successive growing seasons with the goal of interrupting the process by which energy created by photosynthesis in the leaves is transmitted to the rhizomes for storage, thereby weakening the plant. Do NOT bring orphaned or injured wildlife to Mass Audubon wildlife sanctuaries. The key to our approach was to understand the plant, in order to control it. Gather the knotweed for proper disposal. This field is for validation purposes and should be left unchanged. Formerly a partner at the Boston law firm of Ropes & Gray, John now has his own law practice in Lexington, specializing in environmental litigation, and is active in Lexington affairs as a Town Meeting Member and member of the Town finance committee. Since 2002, stewardship of AGM has been provided by the Friends of Arlington’s Great Meadows. Japanese Knotweed Brochure . Regenerative Solutions for Resilient Landscapes, Business Practices Spotlight: Keeping Employees Satisfied, PEST ALERT: Pitch Canker on White Pine. No herbicides have been used for either method. However, the new growth has been noticeably less vigorous, and most of it can be uprooted by hand with a relatively minimal effort. If the knotweed control failed, the use of herbaceous species allowed for the site to be easily mowed. Arlington’s Great Meadows “before” condition – 2004. are invasive perennials, with four species found in British Columbia: Japanese knotweed (Fallopia japonica); Bohemian knotweed (Fallopia x bohemica); Giant knotweed (Fallopia sachalenensis); and Himalayan knotweed (Polygonum polystachyum). Overview. Knotweed treated in the planted areas consisted of small clumps with 20 to 30 live canes and larger clumps that were approximately 6 x 10 feet in size. However, this difference could have been due to the difficulty of spraying full-grown knotweed (6-8 feet in height) rather than the effectiveness of the injection method. It is also why it is so often seen lining waterways, roadways, and bike paths. Japanese knotweed (Fallopia japonica) was brought from eastern Asia as a garden plant. Eco-Answers from the Pros: Do I Need Mulch with Groundcover. It was used as an ornamental plant on properties and also for erosion control due to its deep and interwoven root system. Japanese knotweed is easy to spot any time of year: its round, green-speckled, red-brown, inch-thick, hollow stems are thick and woody, standing tall even during the winter. Japanese Knotweed Biological Control Japanese knotweed (Fallopia japonica) is an herbaceous perennial native to Eastern Asia. Clearly, management of knotweed is a difficult undertaking. Designed by Dr Eric Connelly and JKSL, the method does not use any chemicals, and therefore leaves the lowest possible on-site footprint where it is used. Spraying The only herbicide approved for use in or near water which controls japanese knotweed is Glyphosate. After several successive years, it became apparent that knotweed plants that had been cut down two or three times each growing season were starting to weaken and could be pulled out by the roots (rhizomes) with relative ease. Clark County Weed Management: Lewis River Knotweed Control Pilot Project 2004 Report. The concentration of glyphosate required is very high: 4ml to 5ml of 100% glyphosate injected into each stem. The contract began with herbicide treatment in September of 2007. In August 2009, with the end of the contract approaching, knotweed re-growth within the newly planted restoration was pulled and spot-sprayed. For large stands, such as that at Exit 14, the injection method is too time-consuming. Six-inch sprays of tiny, greenish-white flowers sprout from leaf axils in mid-summer, followed in autumn by a profusion of dangling, triangular, winged nut-like seeds as the foliage turns yellow. Knotweed can cause structural damage to asphalt and concrete. The Spruce / Jordan Provost. Both approaches the Friends have taken, however – particularly the longer-term “Cut, Cut, Cut” method – are extremely labor-intensive and thus heavily dependent on the willingness of volunteers to contribute significant efforts over a sustained period of time to work that can be thankless, dirty, and at times downright Sisyphean. Once introduced to a site, knotweed easily out-competes other vegetation to create extensive mono-stands, altering native or otherwise stable vegetative communities and habitat. The family name of Polygonaceae is derived from the Greek words, “Poly” meaning many, and “goni” meaning knee or joint. Of all the invasive species, Japanese Knotweed (Polygonum cuspidatum), once established, is one of the most difficult to manage and eradicate. Invasive Species - (Fallopia japonica) Prohibited in Michigan Japanese knotweed is a perennial shrub that can grow from 3 - 10 feet high. Managing non-native invasive plants includes removal and control of existing species, and monitoring for the appearance of new species and spread of existing species. The intent of the daylilies was to help demarcate for mowers the borders of the planted bed that should not be mowed. 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