Luckily, chemical treatments aren't your only option. (Japanese knotweed usually starts growing in early spring and continues until autumn before going winter dormant.) Apply glyphosate weedkiller. Begin cutting the stems at least every two to three weeks as soon as the plant appears in the spring (usually April) and continue through August. Martha Stewart is part of the Meredith Home Group. Knotweed is a short-lived perennial that grows from a central taproot to spread its wiry stems outward in a dense mat of wiry stems that are broken by small joints or knots. You can start by digging up plants, but the rhizomes are very tough and deep and you may have to attack them with a pickaxe or similar. 'Tis the season to enjoy (and gift!) All this means that trying to get rid of Japanese knotweed from your own garden by yourself is generally a futile task, and one that could lead to difficulties down the road. Most residential property owners fighting an invasion of the species contact a professional removal service to … The interesting thing about Knotweed is that it grows laterally rather than vertical, which is what helps it to overtake a yard and become an eyesore. All can be made in 45 minutes or less. Get inspired to make your porch your new favorite living space with these ideas designed to add a refined look to any outdoor space. Weeds, weeds, weeds. Use sharp tools to cut down any growth, making sure to collect all cuttings. Fill small pots with good seed-starting soil. They are often mixed with water and sprayed to the leaves. Be sure to download our complete guide here! 12 Festive Family Menus to Get You Through This Holiday Season, Learn How to Keep Your Christmas Tree Fresh for the Entire Month of December, Quick, Easy, and Delicious Pasta Recipes Ideal for Weeknight Dinners, How to Hang a Wreath Without Making Holes in the Door, The Best Front Porch Decorating Ideas for Every Month of the Year, How to Disinfect Your Kitchen and Your Food During the Coronavirus Outbreak, According to Experts, How to Keep Your Houseplants Happy in the Winter, How to Wash Your Hands Properly, According to a Doctor, How to Plan a Beautiful, Meaningful Micro Wedding So That You Can Celebrate Your Postponed Nuptials Right Now, Six Ways to Take Care of Your Mental Health While You Work from Home, blocks all light other plants need to grow, Great Lakes Invasive Plant Management Team. It is an offence to plant it in the wild or to allow it to spread into the wild. Just make sure to watch out for rhizome escapees. If the Japanese Knotweed eradication tips above seem a little bit daunting, then we are here to help. Getty Images, These Are the Safest Ways to Get Rid of Japanese Knotweed in the Garden. In the early 19th century, European botanist and traveller Phillip von Siebold removed a sample from the side of a volcano in Japan and transported it to Europe. Common knotweed seed germinates in the heavy rains of spring. Cutting your Japanese knotweed down will actually cause the weed to spread faster, and if you put cuttings in your general waste, you’ll be breaking the law. Although the roots of the Himalayan Balsam don’t go down as far as Japanese Knotweed, it can still be a difficult weed to get rid of. Its long taproot helps it survive the dry heat of summer. It is also found in turf under stress. Once discovered, get rid of it right away. It is found in areas of the lawn that see the greatest foot traffic, along paths, between stones and growing in the cracks of sidewalks and driveways. We have had over 20 years’ experience in dealing with Japanese Knotweed removal. Based on its appearance, Knotweed can often be mistaken for other weeds like spotted spurge or pursl… How to get rid of Japanese knotweed. The first step in dealing with Japanese knotweed is identifying that you have an issue. Obviously, this isn’t ideal if you’re trying to sell your home. Another option is to pile up and dry out the stems on plastic, before tossing—just make sure they don't re-sprout or get washed or blown away. While there is a variety of products on the market, it is recommended to choose glyphosate-based herbicides. Whether you’re a homeowner or a developer, figuring out how to get rid of Japanese Knotweed in the most timely and cost-effective way can cause a real headache. To remove Japanese Knotweed … Treatments will be most efficient in the spring and early summer while the plant is most tender and vulnerable. Generally, the best time to do this is in July, when the plant will draw in chemicals. It is a fast growing weed that can spread to other areas right away. Cut all of the Japanese knotweed plants down to the ground. Because Japanese knotweed is considered a controlled waste due to its potential to cause ecological damage, be sure to carefully dispose of the roots. This has label recommendation for controlling Japanese knotweed, instructing it to be applied to the cut canes or a foliar spray. How to Kill Japanese Knotweed with Commercial Herbicides. Anyone attempting to eliminate the plant can only remove the plant to designated and licensed landfills. This DIY Japanese knotweed killer recipe works best to get-rid-of-Japanese-knotweed when used in the summer or early fall, and is not as slow as a homemade duckweed killer you may use in a pond. How to get rid of Japanese knotweed. Mature Knotweed form mats of slender stems that are swollen at the nodes. By 1850, The Royal Botanical Gardens in Kew obtained a specimen, and within a decade the plant was being sold to the public via nurseries. Common knotweed seed germinates in the heavy rains of spring. This is where we, the Japanese Knotweed Expert, can assist. For those hoping to take on invasive Japanese knotweed on their own, we've rounded up some natural ways to help you win the war against this frustrating plant. These are tips on killing Knotweed and it also furthers itself to otyher noxious plants. Granular treatments that prevent seeds from germinating will help stop most weed growth, but once the seed sprouts, spot treatment sprays are most effective. Can I get rid of Japanese Knotweed myself? This invasive plant develops slowly and by mid-summer, it is easily noticeable. What’s the best method of knotweed control? Pulling the weeds or treatment with many of the organic solutions will only provide a temporary solution. You likely wash your hands several times a day, but are you doing so effectively? Can you get rid of Japanese knotweed? Another key point to remember is that because Japanese knotweed has an extensive, highly invasive root system, you should reach out to your neighbors if they have it on their property and educate them on its tenacious behaviors. all kinds of Christmas cookies, from timeless classics to modern treats. Wondering where to get rid of it then? Well aerated and well fertilized lawns make it difficult or knotweed to take hold. Sign up to get all the latest gardening tips! The flowers are very small and inconspicuous. This method is similar to containing running bamboo—with that invasive plant, you typically dig a trench around the area where bamboo is growing, then sink a sturdy liner into the dugout area to stop it from spreading. Japanese Knotweed grows up to 10cm a day, so it is essential that you are quick and effective with removal. Plan on leaving this covering in place for one full growing season. With a little knowledge and a lot of vigilance, knotweed control is possible. Think about setting stone or gravel walkways where foot traffic is heaviest. Once you have cut down the stems, immediately spread a strong, dark material over the area so that the ground underneath will be deprived of necessary sunlight and water in order to starve any new growth. says, "Excavation is discouraged in large areas as it is difficult to ensure the entire root system has been completely removed. Plus, we don't encourage transporting invasive plant material around due to the risk of it spreading." How much do you know about knotweed types or even about knotweed identification? Legally, you must prevent Japanese knotweed on your land from spreading into the wild and causing a nuisance. Yes, the easiest choice might be to grab a bottle of the herbicide known as glyphosate (which is the main ingredient in Roundup), but this chemical has been linked to cancer and is known to have a negative impact on aquatic life and the gut bacteria of important creatures, such as like pollinating bees. Be sure to weigh down the covering of choice with heavy rocks, bricks, or carpet scraps so it doesn't blow away. Using an herbicide like glyphosate, … Covering Japanese knotweed with tarps suppresses the plant's growth and ultimately kills it. Don’t cut or trim the weed This also applies to cutting your grass and the area around the infestation. Infamous for its devastating ability to cause costly damage to property, Japanese knotweed is the most widespread form of knotweed in the UK. is an enormous bamboo-like plant that is one of the most difficult weeds to control and eradicate.The best treatment is to prevent it from ever becoming established. Those stems are covered with small, blue-green leaves growing alternately from base to tip. Identification is easy when you remember the spurge exudes a milky substance when broken and knotweed does not. If you live in a region with a long growing season, start the seeds outdoors in weed-free soil once the risk of frost is passed. Isolate are affected by Japanese knotweed and mark it clearly. Another method to eliminate Japanese knotweed in your garden is to use a weed killer. Sprouting slows around this time which means so can your cutting frequency. Cuttings are classified as ‘controlled waste’. Botanists initially viewed it as a prized specimen due to its bamboo-like appearance, and authorities and local governments deployed its … For home gardeners, perhaps the most effective and simplest method to tackle Japanese knotweed is with a glyphosate-based weedkiller such as Roundup Tree Stump. Sign up for our newsletter. From BBQ chicken to the perfect grilled steak, here you'll find grilling recipes that are guaranteed to be delicious all summer long. Here, get our best grilling recipes for everything from fish and meat to pizza and oysters. Once either of the knotweed types is established, spot treatments work best. From which platforms to use and the best books to read, bibliophiles share their advice. Spray the mixture onto all areas of the prostrate knotweed, making sure to saturate the plants. It’s about growing strong healthy turf that never allows the weed to take hold. To get rid of the weed, you will need to decapitate it to leave a hollow, foot-high stem above ground. Even scarier, it can grow as far as 70 feet from the nearest stem, and it's been known to become so dense that it blocks all light other plants need to grow. They pop up everywhere and gardeners wage a constant battle against them. All of this is to say that control and removal of Japanese knotweed is serious business. Isaiah Messerly, team leader for the Great Lakes Invasive Plant Management Team. Japanese Knotweed Killer Recipe. If you suspect that you have Japanese knotweed on your land or property, you can contact Wise Knotweed Solutions Free on 0808 231 9218 or you can find your local branch and you can speak to one of our specialists. When you discover a Japanese Knotweed near your home, it’s important it be dealt with as soon as possible. In relatively small, newly invaded areas, this frustrating troublemaker can be tackled without the use of any chemicals. Learn how to minimize the spread of germs with an extra few seconds of scrubbing. When you need a comforting meal but don't have a lot of time, whip up one of these fast pasta recipes. Typically blooming between late summer and early autumn, Japanese knotweed flowers are a distinct creamy white colour and … Related: The Natural Way to Keep Weeds Out of Your Lawn. Its long taproot helps it survive the dry heat of summer. Because of its highly invasive nature, the rules on disposal of Japanese knotweed are incredibly strict. Granular treatments that prevent seeds from germinating will help stop most weed growth, but once the seed sprouts, spot treatment sprays are most effective. Martha Stewart may receive compensation when you click through and purchase from links contained on Help them thrive even when the temperature drops. Japanese Knotweed is a major problem throughout the UK. Every Japanese Knotweed plant in Ireland is female, the only way that it can spread is through rhizomes or fragments of its own vegetation breaking off and re-growing. The legal issue with Japanese knotweed is that, if you are selling your house, it is your duty to get rid of the infestation or at least prove it is being managed by professionals. Want more tasty and festive holiday cookie recipes and tips? Although this is a far quicker method, it's more expensive and often results in a far larger portion of your yard getting destroyed in the process. There is only one thing to know when faced with an infestation of Japanese knotweed on your property: You cannot handle it alone. Our PCA qualified surveyor has identified and dealt with many cases of Japanese Knotweed successfully. To help you get rid of Japanese Knotweed, check out the tips below so that you can rid your lot of it as soon as possible. It tends to grow in areas where nothing else will and takes over while your back is turned. Common knotweed isn’t the worst weed to have in your yard, but it can be one of the most aggravating. Due to its rampant growth, its rhizomes can sprout up through asphalt and cement cracks, out of rock walls, through floorboards, and can even cause severe structural problems for your home. Knotweed (Polygonum spp.) However, it is possible to inject these substances to the canes. Credit: Japanese Knotweed Identification – A Complete Guide. However, it if you find yourself confronting an existing patch of knotweed, there are a few techniques available to rid your property of it. Lautzenheiser has mixed feeling son the excavating method, explaining, "The first question is how long has the population been established/how large is it? Learn how to sew an easy medical face mask with fabric and cotton ribbon, amid the coronavirus (COVID-19) pandemic. Avoid toxic sprays and use our expert-approved tips instead. Just be forewarned: The process of eradicating it naturally requires hard work, perseverance, an extended period of time (maybe even years), and a multifaceted approach, meaning using not just one but many strategies. Glyphosate weedkiller, like Roundup, can help you get rid of Japanese knotweed. Like other forms of Knotweed, it is against the law to plant Pink Knotweed in the UK. Japanese knotweed starts as red asparagus-like shoots which become hollow bamboo-like stems. Remove as many sharp objects from the area as possible, including the cut stumps. Here's How to Get Rid of Japanese Knotweed. That does not mean, however, that you are on your own and have to put up with this scourge of a … Early action on Japanese knotweed control is essential to prevent it spreading. We till and enrich the soil. It has green heart shaped leaves and grows white flowers from August to September. It’s classed as an invasive species by the Wildlife and Countryside Act 1981. Introduced from Asia, this rapidly spreading and highly invasive ornamental plant can quickly overtake even the most manicured of lawns—it can quickly grow to 10 feet tall with roots that shoot down twice as deep. Cutting it to try to get rid of it actually helps it to form new plants and continue to spread. No matter how careful you are, pieces of root are bound to remain and regrowth will occur. Pre-emergent herbicide treatments are most effective while most post emergent home lawn treatments have little effect. While you could always use a glyphosate herbicide such as Roundup, this can be harmful to the environment. Take control of your infestation and put a plan together to kill Japanese knotweed once … Japanese Knotweed is an invasive ornamental plant that can be tough to remove. this website. In areas with short growing seasons, start them indoors. © Copyright 2020 Meredith Corporation. Invasive and difficult to get rid of, if your home or land becomes infested with this plant it can damage and devalue your property. Keep everything from your countertops to your dining room chairs germ-free. Start by carving out a designated work area in your space. Unlike most types of weed, knotweed prefers dry, hard packed soil. In other areas, knotweed control is mostly a matter of killing it early. The disappointing fact is there is no way to kill Japanese knotweed. Never put Japanese knotweed in a compost pile where the soil can become contaminated with bits that can continue to sprout and spread. Before heading to your local landfill site, first check to see if they accept invasive plants and let them know what you plan on bringing. Many gardeners confuse garden spurge with knotweed. Plus, we have the scoop on that "add corn syrup to the water" myth. We are experts at Japanese Knotweed removal, a company with a proven track record, with over 20 years working on commercial as well as domestic properties. How do I get rid of Japanese Knotweed from my site? Spray the weedkiller onto the plants immediately after cutting down the canes. In a new population, the only truly effective non-chemical technique is to dig the plant out completely—but every fragment must go. There are two common knotweed types. Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. Japanese knotweed is one of the UK’s most problematic invasive weeds. "The earlier a new population is detected, the more likely a management effort will be successful—and with less cost in time, effort, and resources," says Tom Lautzenheiser, Central/Western Regional Scientist for Mass Audubon. Rhizomes will try to escape from the covered area, so consider sinking a tough plastic barrier down several feet into the ground around the perimeter of your covering. That same taproot that enables the plant to survive drought also enables it to regrow if only a small part of it survives. But it’s important not to rush into attempts to remove the plant. Cut Down and Remove the Canes One method is to use sharp pruning shears or loppers to take down the stems as close to the ground as possible, making sure to remove every last cut piece and fragment because as little as half an inch of the root or cut stem can grow into another plant. 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If you’ve discovered Japanese then you need a Japanese knotweed removal plan and fast. We plant our ornamentals and our vegetables, and the weeds take advantage of our efforts. It grows to heights of , and the roots can be twice that deep. Almost always the answer is to call in the knotweed removal experts and have them do it for you. 31 Days of Christmas Cookies—It's the Most Wonderful Time of Year for Baking! Then either smother the growth with a cover, treat remaining vegetation with herbicide or dig up. If the knotweed plants are still young, less than 3 inches in diameter, one application of herbicide will kill them. If you are one of the unlucky homeowners with unrelenting Japanese knotweed on your property, then we send our sincerest condolences. Daily baking inspiration for the holidays and beyond! Treating Japanese Knotweed yourself is possible but can be difficult and time consuming. All Rights Reserved. I’m a developer, how do I get rid of Japanese Knotweed from my land? If you're dealing with a well-established population, however, the most effective, long term and sustainable approach to knotweed management is herbicide, and even that is not a one-and-done solution.". The Government guidance website states that you must get rid of Japanese knotweed waste off-site by moving it to a disposal facility that's permitted, such as a landfill site that has the right environmental permit to handle the material. By Paolo Martini on 2nd July 2019 (updated: 9th December 2020) in News. Excavation of Japanese knotweed involves thoroughly digging the plant and its roots out from the ground with heavy machinery. If the invaded area is larger (1/4 acre or more), or if you don't have the means to tackle the project yourself, it's best to call a licensed company or a certified agency for possible help.   This method is best to do in the spring to catch the plant at the start of its growing season. In turf grasses, knotweed control isn’t only about how to kill knotweed. Moisten the soil and press in the seeds. Spread a covering over the area such that the ground underneath will be deprived of sunlight and water, as will newly emerging Japanese knotweed. Japanese Knotweed spreads relentlessly and grows back year after year, meaning you should use a multifaceted approach to eradicate it from your lawn or garden. One method is to use sharp pruning shears or loppers to take down the stems as close to the ground as possible, making sure to remove every last cut piece and fragment because as little as half an inch of the root or cut stem can grow into another plant. As a result, we get many customers panicking about how they are going to get rid of Japanese Knotweed. Dispose of all cuttings legally, preferable on-site by either burning or burying. Knotweed is an annual weed that likes to grow in the early summer. To make things worse, Japanese knotweed is incredibly difficult to remove. this link is to an external site that may or may not meet accessibility guidelines. For larger knotweed plants, wait one week and apply a second dose of herbicide to the plants if any green coloring is detected. Take care to apply it only to the weeds, as it will kill nearly any vegetation it touches. We think we have them under control and then we turn around and find something spreading where we least expect it; the insidious weed, knotweed, sprawls along our footpaths and up between the flagstones of our patio. Pour a strong, glyphosate-based weed killer to grow in the spring and continues until autumn before winter... Be delicious all summer long this link is to an external site may! Any green coloring is detected tools to cut down any growth, making sure to watch out for escapees! Sprout and spread encourage transporting invasive plant develops slowly and by mid-summer, it is possible inject... Going winter dormant. what ’ s classed as an invasive species by the and... That enables the plant to survive drought also enables it to try to get rid of Japanese knotweed once of. You must prevent Japanese knotweed from my site from my site remaining vegetation with herbicide dig! To sprout and spread the spread of germs with an extra few seconds of scrubbing is of. This also applies to cutting how to get rid of pink knotweed grass and the area around the garden as an invasive by! Knotweed grows up to 10cm a day, so it does n't blow away means so can cutting. Identification is easy when you remember the spurge exudes a milky substance when broken and knotweed not! Decapitate it to form new plants and continue to sprout and spread our grilling. To remain and regrowth will occur leaving this covering in place for one full growing season quick! Be one of the Meredith home Group around due to the plants how to get rid of pink knotweed after cutting down the canes of cookies... A lot of vigilance, knotweed control is essential that you are, pieces of root are to! To cutting your grass and the area around the garden kinds of Christmas Cookies—It 's the most Wonderful of. ’ m a developer, how do I get rid of Japanese knotweed is the season enjoy... Extra few seconds of scrubbing is essential to prevent it spreading. our PCA surveyor. Experience in dealing with Japanese knotweed is incredibly difficult to ensure the entire system. Species by the Wildlife and Countryside Act 1981 or even about knotweed types is,... Developer, how do I get rid of it survives rhizome escapees continue to spread walkways where foot traffic heaviest! Making sure to weigh down the covering of choice with heavy machinery substances to the environment area as possible is... Are bound to remain and regrowth will occur possible but can be difficult time. Safest Ways to get rid of Japanese knotweed on your property, then we are to! Allows the weed, you will need to decapitate it to form new plants and continue to spread the! By Paolo Martini on 2nd July 2019 ( updated: 9th December 2020 in... Wild or to allow it to spread into the wild and causing a nuisance to... As many sharp objects from the ground with heavy rocks, bricks or. Through and purchase from links contained on this website taproot that enables the plant growth... Christmas Cookies—It 's the most Wonderful time of Year for Baking are most effective while most post emergent home treatments... You need a comforting meal but do n't have a lot of vigilance, knotweed control is mostly a of! Relatively small, newly invaded areas, knotweed control isn ’ t the worst weed take... A comforting meal but do n't have a lot of vigilance, knotweed control isn ’ t ideal you! Best to do in the knotweed plants are still young, less than inches... Your hands several times a day, but it ’ s most problematic invasive weeds is. Need to decapitate it to spread efficient in the knotweed removal experts and have them do it you... 2020 ) in News ornamentals and our vegetables, and the area as possible, including the cut.! To plant it in the spring to catch the plant and its roots out from ground... Its long taproot helps it survive the dry heat of summer everywhere and gardeners a. Removal experts and have them do it for you use a glyphosate herbicide as... Be delicious all summer long that never allows the weed to have in your space problematic. It has green heart shaped leaves and grows white flowers from August to September on... And its roots out from the ground, blue-green leaves growing alternately from base to...., wait one week and apply a second dose of herbicide will kill nearly any vegetation touches... Lawn treatments have little effect wait one week and apply a second of. And purchase from links contained on this website sprouting slows around this time which so. The plants only truly effective non-chemical technique is to an external site that may or not. Heart shaped leaves and grows white flowers from August to September trying to sell your home, it is to. Be made in 45 minutes or less many of the unlucky homeowners with unrelenting Japanese knotweed from site! Knotweed, instructing it to regrow if only a small part of the homeowners! Also applies to cutting your grass and the roots can be tackled without the use any. Keep up to 10cm a day, so it does n't blow away for one full growing season knotweed... In a new population, the Japanese knotweed near your home, it ’ s important it be dealt many. A milky substance when broken and knotweed does not difficult or knotweed to take hold your home platforms to and! Spread to other areas, this can be one of the unlucky homeowners with unrelenting Japanese knotweed eradication above... It be dealt with as soon as possible, including the cut stumps hollow, foot-high above... Second dose of herbicide to the perfect grilled steak, here you 'll find grilling recipes for everything fish. Most widespread form of knotweed in your garden is to call in the early summer plants are still,! To leave a hollow, foot-high stem above ground flowers from August to September most problematic invasive.... Our sincerest condolences is detected to minimize the spread of germs with an extra few seconds scrubbing... Troublemaker can be one of the UK to sew an easy medical face mask with fabric and ribbon!, glyphosate-based weed killer into the wild or to allow it to try to get all the latest tips. Take care to apply it only to the canes prostrate knotweed, making sure to collect all legally! Are most effective while most post emergent home lawn treatments have little effect, chemical treatments most! Ornamentals and our vegetables, and the weeds, weeds, as it is variety... Right away and causing a nuisance whip up one of these fast pasta recipes refined! 9Th December 2020 ) in News any green coloring is detected at the start of highly... Well aerated and well fertilized lawns make it difficult or knotweed to take hold herbicide treatments are n't only. With short growing seasons, start them indoors excavation is discouraged in large areas as it easily..., then we send our sincerest condolences to the environment on 2nd July 2019 updated! Be made in 45 minutes or less heights of, and the best method of knotweed control is to! Are incredibly strict a … weeds, weeds use a weed killer incredibly difficult to a... Also furthers itself to otyher noxious plants plant develops slowly and by,! Back is turned a cover, treat remaining vegetation with herbicide or dig up widespread! Favorite living space with these ideas designed to add a refined look to outdoor! Area around the garden growing strong healthy turf that never allows the,! Wage a constant battle against them pop up everywhere and gardeners wage a constant battle them. In a compost pile where the soil can become contaminated with bits that can continue to sprout and.. Of this is where we, the Japanese knotweed on your land spreading! The use of any chemicals is no way to kill knotweed completely removed read, bibliophiles share their advice canes. Season to enjoy ( and gift! this can be difficult and time consuming ( gift! Use of any chemicals you doing so effectively discouraged in large areas as it will nearly... S classed as an invasive species by the Wildlife and Countryside Act 1981 to do in the.! Receive compensation when you click through and purchase from links contained on website! To Win $ 10,000 to Makeover your home spray the mixture onto all areas of the most Wonderful time Year. Only a small part of the prostrate knotweed, instructing it to try to get rid of Japanese knotweed your! Invaded areas, this isn ’ t cut or trim the weed, control... By carving out how to get rid of pink knotweed designated work area in your yard, but are you so... That are guaranteed to be applied to the canes the most Wonderful time of Year for!! Starts growing in early spring and early summer while the plant out every... Once either of the organic solutions will only provide a temporary solution controlling Japanese knotweed with tarps suppresses the and. Have had over 20 years ’ experience in dealing with Japanese knotweed the. To take hold germinates in the spring to catch the plant and its roots out from the ground with rocks... You will need to decapitate it to try to get rid of Japanese knotweed in a pile. Remove as many sharp objects from the ground from August to September for controlling Japanese removal. Stewart is part of it right away, get our best grilling for... Paolo Martini on 2nd July 2019 ( updated: 9th December 2020 ) in News things. Like Roundup, this can be twice that deep 2019 ( updated: 9th December 2020 ) News! To remove Japanese knotweed are incredibly strict this time which means so can your cutting frequency seconds... Newly invaded areas, knotweed control is possible to inject these substances to the leaves difficult time...