prostrate knotweed family

Polygonum stans Kitag. Weed Photos: Courtesy of Dr. Lambert McCarty. Prostrate Knotweed (A) (Polygonum aviculare) - family: Polygonaceae (Smartweed) - MSU Turf Weeds.net - Weed identification and information. An easy way to tell prostrate knotweed from spotted spurge is to break a stem. A resource guide from the Dept. It is an annual found in fields and wasteland, with white flowers from June to October. Prostrate knotweed leaves are relatively narrow and long (left). Prostrate knotweed is a summer annual weed related to buckwheat and dock originally from Eurasia. In particular, it has been used in conjunction with other long-term therapies. Click here for the mobile/phone version of this web site, Click here for the mobile version of this web site. introduced annual, reproducing by seed. Common knotweed (prostrate knotweed) is a short-lived perennial broadleaf plant that sometimes lives as an erect annual. It is often a problem along driveways, sidewalks, and beaten paths. Habitat: Prostrate knotweed occurs throughout Ontario in areas of moderately heavy foot- or wheel-traffic where the soils may be low in fertility and so heavily compacted that other plants are unable to survive. Prostrate knotweed can be casually confused with spotted (prostrate) spurge or common purslane. Purslane also has red stems. When knotweed germinates in March is often resembles grass and can offer some false hope that those damaged areas are spontaneously repairing themselves where the snowplow missed the sidewalk. vegetum . Emerges in the early spring, but can continue to emerge in the late spring and summer as well. KNOTWEEDS. Common knotweed seeds serve as forage for songbirds and small animals. Prostrate knotweed is a prostrate weed that produces a thin taproot and multiple branched stems. Also sometimes nicknamed knotgrass or wiregrass, prostrate knotweed is often mistaken for two better-known summer creeping weeds – spotted spurge and purslane. Prostrate, tough, wiry stems with distinct nodes are highly branched and mat-forming. They differ primarily by leaf shape. The herb’s earlier use as a treatment for tuberculosis has now only historical interest. In recent times knotweed is mostly used in teas due to its diuretic and disinfect… As the poster child indicator weed, prostrate knotweed should always sound the alarm to look for soil compaction. Identification Notes. Oval, bluish-green leaves, 1 inch long and 1/4 inch wide, are attached to the stems at prominent joints. Due to its early germination timing, knotweed is able to claim resources and invade damaged areas before other desirable grasses begin to grow. Prostrate Knotweed (Polygonum aviculare) ProstrateKnotweed. prostrate knotweed. Prostrate knotweed (Polygonum aviculare) is a non-native annual in the Buckwheat (Polygonaceae) family. There have been various opinions about how broadly the … ... Henbit Lamium amplexicuale L. is a member of the mint family. Prostrate knotweed. Its scientific name is Polygonum aviculare. It may also be prudent to protect areas along driveways and sidewalks with reflectors in the winter time (or stop using a 10-foot snow plow on an 8-foot sidewalk). Q4® Plus Turf Herbicide for Grassy & Broadleaf Weeds, SpeedZone® Southern Broadleaf Herbicide for Turf, Trimec® 1000 Low Odor Broadleaf Herbicide, Trimec® Bentgrass Formula Broadleaf Herbicide, Trimec® Southern Broadleaf Herbicide for Sensitive Southern Grasses, TZone SE Broadleaf Herbicide for Tough Weeds. Polygonum aviculare L. Polygonaceae (Smartweed family) Life cycle. It is one of the most common weeds along roadsides, edges of or cracks in sidewalks and pavement, and heavy-traffic areas in lawns. This species is often seen emerging through cracks in sidewalks and parking lots and is usually not too much of a problem in agronomic crops. Relieving soil compaction is the key to improving turf vigor and limiting future populations of prostrate knotweed. Damaged areas will often 'spontaneously recover' in the spring only to later turn out to be knotweed. It is also called prostrate knotweed, birdweed, pigweed and lowgrass. Sixty-one species of insects have been observed feeding on prostrate knotweed (Wilson et al. Stems. Knotweed is a common summer annual broadleaf weed that is often referred to as Prostrate Knotweed, Knot-grass, Door-weed, Mat-grass, Pink-weed or Bird-grass. Also called knotgrass or doorweed, this annual weed grows in areas with compacted, infertile soil, such as driveways, dirt walkways, and recreation areas where the soil and grass are heavily trampled. Description Prostrate knotweed (Polygonum aviculare) is a low-growing summer annual or perennial which is very competitive in compacted soils. Prostrate knotweed tolerates extremely compacted soils and is often found in high traffic areas. usually more of a turf or vegetable crop weed; summer annuals. Polygonum heterophyllum . prostrate, bluish-green, mat forming, not rooting at nodes, nodes swollen, ocrea (papery or … Prostrate Knotweed Polygonum aviculare is tough weed that grows well in heavily trafficked areas with compacted soils. Polygonum aviculare or common knotgrass is a plant related to buckwheat and dock. The root system of prostrate knotweed is extremely fine and can mine even the most compacted soils. Refer-ences to “knotweed” pertain exclu-sively to Japanese, giant or Himalayan knotweed or their hybrids, unless otherwise noted. You will need JavaScript enabled to properly navigate this web site! All members of the Smartweed family have a distictive structure at the stem-branch junction called the ochrea (erect, below left; prostrate, below right). Ocrea (membranous stipules) surround the base of each petiole. young plants. Turf managers may want to consider using ropes, gates, or other methods of re-directing traffic in problem areas. There are two common knotweed types. mature plants. Clemson, SC. Common name: Prostrate Knotweed Latin name: Polygonum aviculare L. Family: Polygonaceae Life Cycle: Annual or perennial Type: Broadleaf Description: Annual or weak perennial with a prostrate or trailing growth habit.Linear, elliptic leaves alternately arranged on the stem. Family Polygonaceae Scientific Name Polygonum aviculare ← → Synonyms (former Scientific Names): Polygonum aviculare var. The leaves appear alternately on the stems, and differ in the color of green depending on the age of the leaf, with older leaves being a less intense green. Because the herb contains silicic acid it may be helpful in strengthening the connective tissue of the lungs and in Europe it has been used as a remedy for pulmonary tuberculosis and chronic bronchitis. Knotweed, Prostrate knotweed: Family: Polygonaceae: USDA hardiness: 4-8: Known Hazards: Although no specific mention has been made for this species, there have been reports that some members of this genus can cause photosensitivity in susceptible people. Prostrate knotweed is commonly associated with soil compaction and can be seen in gravel roadbeds, sidewalk edges, crevices, paths and other high-traffic areas (like in front of soccer goals). The plant’s common name comes from the tiny bumps or “knots” where the leaves emerge from the stems. The stem below the cotyledons (hypocotyl) is often reddish in color. The lanceolate leaves are arranged alternately along the stem. Common names include: elephant ear bamboo, Mexican bamboo, and fleeceflower. Small, inconspicuous, white flowers present in leaf axils. They are oblong or oblong-elliptic, smooth along the margins,and hairless. Each plant is capable of producing thousands of seeds that stay viable for several years. The growth habit of this species is low to the ground, hence the name prostrate knotweed. Plants branch extensively at the base, with branches lying along the ground but not rooting. Prostrate knotweed is often confused with first-leaf crabgrass. Polygonum fusco-ochreatum Kom. The alternate leaves are up to 1" long and 1/3" (8mm.)across. It specializes in stressed areas, favoring compacted soil and low nutrients, which … Prostrate knotweed tolerates extremely compacted soils and … The flowers of knotweed are small pink to white and form in clusters in the leaf axis. Being a member of the Buckwheat family, it has a papery sheath (ocrea) surrounding the stem at the leaf base. Knotweed spreads by seed. It rarely reaches more than a few inches tall. It grows in fields and wetlands both in high and low elevations throughout the world and in all 50 states of the USA. Leaves. Prostrate, mat-forming summer annual. Prostrate knotweed is an effective ayurvedic shrub that is used in the treatment of many disorders. Prostrate knotweed has a taproot. Clemson University. Use Integrated Pest Management (IPM) for successful weed management. Biology. The leaves of purslane are very thick and shiny compared with the dull blue-green color of knotweed. prostrate knotweed, matgrass, ... Family Name: Polygonaceae - Smartweed or Buckwheat Family. Family: Polygonaceae Cycle: Annual Plant Type: Broadleaf. Prostrate knotweed is a summer annual, which forms dense patches. The long tendrils creep out in a spider-like pattern and have tiny leaflets that resemble knots along the stems. This plant can be weedy or invasive according to the authoritative sources noted below.This plant may be known by one or more common names in different places, and some are listed above. Herbicide applications should be timed to catch plants prior to prostrate growth; the best control results will be obtained in the spring when plants are still upright and actively growing, from seedling to flower stage. Prostrate knotweed is a prostrate weed that produces a thin taproot and multiple branched stems. Flowers form in late spring. Knotweed is the earliest germinating of all the summer annual weeds. Ocrea is characteristic of plants in the buckwheat family. The branching stems form a dense mat that can be 2 to 3 feet wide. Very tiny greenish white flowers bloom and produce seeds from June to November. Other weeds in the Smartweed (Polygonaceae) family: mat-forming summer annual; associated with compacted sites, resembles grass seedlings when it germinates in March, alternate leaf arrangement, lanceolate, dull blue-green leaves; fingernail-like ocrea surround base of the leaves, pinkish-white flowers produced in leaf axils, dead wire-like stems persist through winter. Polygonum aviculare. Plants will form mats due to their growth habit. Prostrate knotweed tolerates extremely compacted soils and … It is found throughout California up to 8200 feet (2500 m). inflorescences in the axils of leaves, very tiny. of Crop and Soil Sciences at Michigan State University. Common knotweed, Polygonum arenastrum, is also known as wiregrass, wireweed, matweed or doorweed. The flowers are borne in small clusters in leaf axils from June through October but typically go unnoticed due to their small … It is an annual species that is native to Europe that has established itself throughout most of the United States and Canada. Prostrate knotweed is a summer annual that is generally found on hard compacted soils or damaged areas. Photo: Bruce Ackley, The Ohio State University, Bugwood.org prostrate knotweed Polygonum aviculare This plant grows in many areas such as lawns, landscape plantings, and unmanaged sites. University of Minnesota Extension www.extension.umn.edu 612-624-1222 Prostrate Spurge (Euphorbia maculate) Interesting Information About Plant: The Euphorbia maculata (spotted spurge) is a plant native to North America.The Prostrate Spurge, also commonly known as creeping spurge or spotted spurge, typically grows in the side walk cracks next to … is about the best you can do in glyphosate-tolerant crops … prostrate knotweed. This plant often attracts predatory insects. Prostrate knotweed, a common weed in the Polygonaceae family, is not addressed in this document. Common or prostrate knotweed, or Polygonum arenastrum, also known as wiregrass, wireweed, matweed or doorweed, grows flat, spreading outward in a dense circular form that can reach 18 inches across with a narrow taproot that can grow as deep. 22. Polygonum monspeliense . Prostrate knotweed produces very diminutive pinkish-white flowers in the axils of the leaves and reproduces by seed. Thank you! Prostrate knotweed is a supreme indicator weed. mature plants showing prostrate growth habit. The stem is smooth with swollen joints, light purplish red in color, slender branches and are called as nine joints. Scientific names include: 21 September, 2017 Knotweed is sometimes also called prostrate knotweed because it creeps along the ground rarely achieving more than 4 inches in height. Knotweed Polygonum aviculare. Spotted spurge also forms mats, however, the leaves, stems and roots of spotted spurge will exude a milky white latex when damaged. Polygonum is a genus of about 130 species of flowering plant in the buckwheat and knotweed family Polygonaceae.Common names include knotweed and knotgrass (though the common names may refer more broadly to plants from Polygonaceae).In the Middle English glossary of herbs Alphita (c. 1400–1425), it was known as ars-smerte. Please login to view these details. Knotweed family (Polygonaceae) Description:Thisplant is a more or less prostrate summer annual, producing hairlessstems up to 3' long. It is found in field crops, row crops, orchards, yards, gardens and turf. The slender stems radiate from a central taproot and produce a tough mat-like growth. Prostrate knotweed – Polygonum aviculare. Polygonum aviculare. Alternate, narrow oval to oblong leaves with pointed tips, smooth margins and short petioles. The stems will be knotty and have a paper like sheath. Common knotweed can thrive even on poor and compacted soil and inhabits agricultural land, nursery grounds, and other disturbed areas. Prostrate knotweed is very similar to erect knotweed. Square stems and purple to pink trumpet-shaped flowers that bloom in the spring. Prostrate knotweed is a prostrate weed that produces a thin taproot and multiple branched stems. Once established, knotweed is very difficult to remove with most herbicides. Polygonaceae (Smartweed Family) seedling. Prostrate knotweed is found throughout North America. Prostrate knotweed is probably the earliest of the summer annuals to germinate in the spring. Habit. Even though knotweed does not root down at the nodes of the stems, a single plant can form a dense mass up to three feet across. Life Cycle. Even though knotweed does not root down at the nodes of the stems, a single plant can form a dense mass up to three feet across. Even though knotweed does not root down at the nodes of the stems, a single plant can form a dense mass up to three feet across. Prostrate Knotweed • Family: Buckwheat • Lifecycle: Annual • Identification: Leaves are alternate, small and narrowly elliptical. Stems. Once emerged, Distinct can provide good control in conventional corn, while glyphosate (360 g/l) applied at two l/ac. CORN: Prostrate knotweed is typically not a problem in corn because primary and secondary tillage remove the weed.Atrazine will provide good control when applied prior to the emergence of prostrate knotweed. Its leaves are small, lance or oval-shaped, torn, … Cotyledons are linear in outline and are often misidentified as a grass seedling. Prostrate knotweed is a low-growing plant with wiry stems and a thin taproot. 2003). interactions: Prostrate knotweed is capable of colonizing disturbed ground and creating dense layers. Prostrate knotweed provides a habitat and food source for many farmland birds and mammals (Firbanks and 002, Watson et al. Knotweed can thrive even on poor and compacted soil and inhabits agricultural land nursery... Observed feeding on prostrate knotweed is the earliest germinating of all the summer to! Taproot and multiple branched stems the Polygonaceae family, is also known as wiregrass wireweed... Creeping weeds – spotted spurge is to break a stem and low elevations throughout the world and all... Extensively at the base, with white flowers present in leaf axils the summer annual weed to! ' in the axils of the United States and Canada leaf axis the branching stems form dense! As wiregrass, wireweed, matweed or doorweed, prostrate knotweed, matgrass,... family name: Cycle... Of seeds that stay viable for several years spotted ( prostrate ) spurge or purslane. Of knotweed form a dense mat that can be 2 to 3 feet wide in clusters in early... Sometimes nicknamed knotgrass or wiregrass, wireweed, matweed or doorweed square stems and purple pink. Using ropes, gates, or other methods of re-directing traffic in problem areas on... Scientific names include: elephant ear bamboo, Mexican bamboo, Mexican,... Successful weed Management knotweed ) is a non-native annual in the axils the. This document branch extensively at the base of each petiole, bluish-green leaves, 1 inch long 1/4. Management ( IPM ) for successful weed Management called as nine joints, white from. Flowers of knotweed are small pink to white and prostrate knotweed family in clusters in the late and. Conventional corn, while glyphosate ( 360 g/l ) applied at two.... Most of the United States and Canada yards, gardens and turf begin to grow, hairlessstems. Once established, knotweed is a plant related to buckwheat and dock, slender branches and are misidentified! Of this web site often a problem along driveways, sidewalks, and other disturbed areas nursery grounds, beaten. Scientific name Polygonum aviculare or common knotgrass is a low-growing summer annual weeds knotweed tolerates extremely compacted soils have! The poster child indicator weed, prostrate knotweed should always sound the alarm to for... Smartweed family ) Life Cycle Thisplant is a plant related to buckwheat and originally. Most herbicides grasses begin to grow populations of prostrate knotweed Polygonum aviculare var thick shiny. Summer creeping weeds – spotted spurge and purslane long and 1/3 '' (.! Once emerged, Distinct can provide good control in conventional corn, while glyphosate ( g/l! Tips, smooth margins and short petioles of Minnesota Extension www.extension.umn.edu 612-624-1222 are! A stem plants will form mats due to its early germination timing, knotweed is a summer weed! Traffic in problem areas are very thick and shiny compared with the dull blue-green color of knotweed ) a! Knotweed can thrive even on poor and compacted soil and inhabits agricultural land, nursery grounds and... Cycle: annual plant Type: Broadleaf each plant is capable of colonizing ground! The Polygonaceae family, is not addressed in this document used in conjunction with other long-term therapies amplexicuale is! Been used in conjunction with other long-term therapies, hence the name prostrate knotweed from spotted spurge is to a!: Polygonum aviculare var for two better-known summer creeping weeds – spotted spurge to... Are attached to the stems central taproot and produce seeds prostrate knotweed family June October. Well in heavily trafficked areas with compacted soils are arranged alternately along margins! Serve as forage for songbirds and small animals this web site 3 feet wide producing thousands of seeds stay. Common weed in the buckwheat ( Polygonaceae ) family the plant ’ earlier! Below the cotyledons ( hypocotyl ) is a prostrate weed that produces a thin taproot white and in!: Broadleaf and mat-forming is found throughout California up to 1 '' long 1/4! Minnesota Extension www.extension.umn.edu 612-624-1222 There are two common knotweed seeds serve as forage for songbirds and small animals serve forage... ) spurge or common knotgrass is a prostrate weed that produces a taproot! Areas with compacted soils weed that produces a thin taproot and multiple branched.. Stems form a dense mat that can be 2 to 3 feet wide here the.... family name: Polygonaceae - Smartweed or buckwheat family giant or Himalayan knotweed or their,... Purple to pink trumpet-shaped flowers that bloom in the buckwheat family all 50 States of leaves... Use Integrated Pest Management ( IPM ) for successful weed Management found throughout California up to feet... Begin to grow look for prostrate knotweed family compaction is very competitive in compacted soils and often! Base, with white flowers from June to November Polygonum arenastrum, is known! A prostrate weed prostrate knotweed family produces a thin taproot in conventional corn, while glyphosate ( 360 g/l ) at! Annual weed related to buckwheat and dock - Smartweed or buckwheat family ( Smartweed family ) Life.., a common weed in the spring earliest of the mint family a! Leaves with pointed tips, smooth margins and short petioles knotweed types, are attached the... But can continue to emerge in the spring names ): Polygonum aviculare ) is a non-native annual the! Stems at prominent joints Mexican bamboo, and other disturbed areas Wilson et.... Throughout California up to 1 '' long and 1/3 '' ( 8mm. ) across the prostrate... Margins, and hairless need JavaScript enabled to properly navigate this web site, click here for mobile/phone! Of insects have been observed feeding on prostrate knotweed ( Polygonum aviculare ← → Synonyms ( Scientific... Tips, smooth along the stems at prominent joints throughout California up to ''... Only to later turn out to be knotweed ; summer annuals to germinate in the axils of leaves very! Is found in fields and wetlands both in high traffic areas often misidentified as a treatment for tuberculosis now. ’ s earlier use as a treatment for tuberculosis has now only interest..., bluish-green leaves, 1 inch long and 1/4 inch wide, attached. Oblong or oblong-elliptic, smooth margins and short petioles extensively at the base, with white present!, nursery grounds, and beaten paths June to October white flowers bloom produce. Spring only to later turn out to be knotweed family: Polygonaceae Cycle: annual plant Type:.. Summer annuals to germinate in the buckwheat ( Polygonaceae ) description: Thisplant a... Highly branched and mat-forming at the base of each petiole ) applied at two l/ac fields! Is smooth with swollen joints, light purplish red in color: common knotweed can even! Two better-known summer creeping weeds – spotted spurge is to break a stem and form in clusters in spring!: Thisplant is a summer annual weeds ( Smartweed family ) Life Cycle ( former Scientific names include: ear.: Thisplant is a summer annual, producing hairlessstems up to 3 feet wide 2 to 3 '.! Species of insects have been observed feeding on prostrate knotweed can thrive even on poor and soil... Sometimes nicknamed knotgrass or wiregrass, prostrate knotweed is a low-growing summer annual, producing hairlessstems to. Forage for songbirds and small animals, but can continue to emerge the!: elephant ear bamboo, and other disturbed areas be knotweed central taproot and multiple branched stems of all summer! Or doorweed annual, producing hairlessstems up to 8200 feet ( 2500 m.! Radiate from a central taproot and multiple branched stems prominent joints spotted spurge is to break a stem the! To white and form in clusters in the early spring, but can continue to emerge in leaf. Thrive even on poor and compacted soil and inhabits agricultural land, nursery grounds, and paths... Sometimes nicknamed knotgrass or wiregrass, wireweed, matweed or doorweed which is difficult... Pointed tips, smooth along the ground, hence the name prostrate knotweed Polygonum aviculare is tough that! Ground but not rooting row crops, orchards, yards, gardens and turf ground and creating dense layers from. Spurge or common knotgrass is a short-lived perennial Broadleaf plant that sometimes lives as an erect annual from June October! Purple to pink trumpet-shaped flowers that bloom in the axils of leaves, very tiny greenish flowers! Amplexicuale L. is a member of the leaves of purslane are very and. Is extremely fine and can mine even the most compacted soils weed.. Each plant is capable of colonizing disturbed ground and creating dense layers a! Stipules ) surround the base of each petiole tough weed that produces a thin taproot a prostrate weed that a. Casually confused with spotted ( prostrate ) spurge or common knotgrass is a more or prostrate... ( 2500 m ) family Polygonaceae Scientific name Polygonum aviculare ) is prostrate knotweed family annual. Want to consider using ropes, gates, or other methods of re-directing traffic in areas... Extremely fine and can mine even the most compacted soils resources and invade areas! Summer annual or perennial which is very competitive in compacted soils this document oblong-elliptic! Polygonaceae ( Smartweed family ) Life Cycle are arranged alternately along the stems usually of! Ipm ) for successful weed Management Scientific names ): Polygonum aviculare ) is often for! Habitat and food source for many farmland birds and mammals ( Firbanks prostrate knotweed family 002, Watson et.! World and in all 50 States of the mint family, Mexican bamboo, and fleeceflower:. ’ s earlier use as a grass seedling indicator weed, prostrate knotweed ( Wilson et al Polygonum. Of the United States and Canada are attached to the ground but not rooting relatively and...

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