While this looks like it could be Pennsylvania smartweed, (Polygonum pensylvanicum or Persicaria pensylvanica), we are not certain and our natives specialist is out today. Posted by sallyg (central Maryland) on May 17, 2020 5:26 PM. Basionym: Polygonum pensylvanicum Linnaeus 1753. An up-right branched plant reaching heights of 1 to 4 feet with a shallow tap root and fibrous secondary roots. + Expand All - Collapse Specimens and Distribution. Polygonum aviculare L. APNI* . Sign up to get all the latest gardening tips! Erect knotweed (Polygonum erectum L.) is another Polygonum species that is found in Illinois. Common names include Pinkweed , Pink Knotweed , Smartweed , and Pennsylvania Smartweed . Synonyms: Persicaria bicornis, P. longistyla, P. mississippiensis, P. pensylvanica, Polygonum bicorne, P. longistylum, P. mexicanum, P. mississippiense. Description. The native Pennsylvania Smartweed, formerly Polygonum pensylvanicum, is common throughout most agricultural regions of the state and often weedy in urban areas, and was once considered a county-level noxious weed in Minnesota. by Melody Rose (melody) September 5, 2015. It only takes one-tenth of a second of heat from a gas torch to kill smartweed, and once killed with flame, the weed won’t return. Plant Glossary. County documented: documented to exist in the county by evidence (herbarium specimen, photograph). This wild grain is an important food source for wildlife, but it becomes a noxious weed when it gets into garden plots and lawns. Cultivating the garden this spring resulted in a lot of these growing, along with henbit and others. Synonyms. Quick facts. Identify a weed; List of all weeds; Key to weeds in turf; Ladysthumb is a summer annual broadleaf weed that grows in moist soil. Privacy and Legal Statements — It can grow explosively in seasonal water basins, receding waterlines of lakeshores or any moist disturbed area. Usage Requirements. Smartweed leaves are shaped like lancets and may have purple blotches. Polygonum pensylvanicum . Many common roadside weeds are more than just a nuisance. laevigatum Fern. Please note: one or more of these active ingredients may exist in combination-type brand name products. Polygonum pensylvanicum is a species of flowering plant in the buckwheat family, Polygonaceae, that is native to eastern North America. Emerge in the spring and set seed in late summer/fall and die. Smartweed possesses powerful nutritional properties that have been traditionally used for respiratory support, to relieve bloating, and for gastrointestinal distress.The recognized benefits of smartweed are not exclusive to herbal or … Polygonum pensylvanicum. Some organic herbicides, such as acetic acid and citric acid, are effective at killing young smartweed plants, but they might also harm garden plants unless applied very carefully. ©Thomas G. Barnes. It was first named and described as Polygonum pensylvanicum by Carl von Linnaeus in the first edition of Species Plantarum in 1753. Also covers those considered historical (not seen in 20 years Identification Polygonum bungeanum Turcz. Smartweed (Polygonum pensylvanicum) and closely related lady's thumb (P. persicaria) are a shade gardener's worst nightmare, because they grow best in moist partial shade.Found throughout North America, these native annuals produce thousands of hard-coated seeds. Flamers can also help you take control of smartweed in your lawn or garden. An overview of the individual specimens are provided in the table that follows. View plant photos, descriptions, maps, treatment options, and more. One of the first things you might notice is that the stems are divided into segments. Description: Prostrate to decumbent herb, commonly mat-forming, stems to 100 cm long, often rooting at nodes. Ladysthumb (Polygonum persicaria) Click on images to enlarge . The leaves have smooth edges and sparse hairs on the surface. Non-native: introduced (intentionally or unintentionally); has become naturalized. Native: indigenous. Polygonum pensylvanicum. Family: Buckwheat or Smartweed Family (Polygonaceae) Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. The rhizomes are white and thin; hence this weed is often called "shoestring". Information and resources for the Ag Sciences community. Scientific Name: Polygonum pensylvanicum. 2020 The Pennsylvania State University. Polygonum pensylvanicum Polygonum pensylvanicum (L.) Small var. Pennsylvania smartweed leaf. Polygonum pensylvanicum var. Getting rid of smartweed begins with good cultural practices. Polygonum virginianum. They serve an important purpose in a number of aspects. Frequent mowing helps keep the grass healthy, and it removes the tops of weeds, such as smartweed, before they have a chance to produce seeds. Polygonum pensylvanicum Add to Bookmarks. Leaves are alternately attached. Smartweed ( Polygonum pensylvanicum) is an annual broadleaf. As an annual, it reproduces through seeds that drop near the parent plant to produce new plants. Smartweed, also known as Polygonum hydropiperoides, is a plant that grows in low, wet environments throughout North and South America. 1753. Any material used for herbicidal control of any plant may vary in efficacy. Polygonum punctatum. rosiflorum Polygonum pensylvanicum POLYGONUM PENSYLVANICUM Linnaeus, Sp. Polygonum pensylvanicum Life cycle: summer annual Growth habit: grows from 1 to 4 ft. tall; leaves alternate, lanceolate, smooth margins, sometimes with a purplish thumbprint marking the 2 to 3 in. It is native to parts of North America, where it is widespread in Canada and the United States. Life cycle: Summer annual Growth Habit: Prostrate Propagation: Seed Leaf Margin: Smooth Leaf Hairs: Sparse Leaf Structure: Lanceolate to elliptic or egg-shaped Leaf Arrangement: Alternate Root Type: Shallow taproot with fibrous roots Flower Color: Bright pink to white. laevigatum Fern. Pennsylvania Smartweed (Polygonum pensylvanicum) Polygonaceae - Buckwheat family © Daniel Reed. Pennsylvania Smartweed and Ladythumb (Polygonum pensylvanicum L. and P. persicaria L.) Life cycle: Summer annuals. Common Names: Pennsylvania Smartweed, Pennsylvania Knotweed, Pinkweed, Pink Knotweed, Pinweed. Threat status Europe: Not evaluated (IUCN) The EUNIS species component has very limited information about this species. Before we discuss how to control smartweed, let’s take a look at a few key physical features that can help with smartweed identification. Upcoming Virtual Trainings Starting 2021-Register NOW. leaf; conspicuous ocrea surrounding point where petiole meets stem There is also a perennial smartweed, swamp smartweed (P. amphimbium L.). As an annual, it reproduces through seeds that drop near the parent plant to produce new plants. Please read the full disclaimer on herbicide usage. Sign up for our newsletter. Barnes, T.G., and S.W. It prefers to grow alongside other plants like pickerelweed, pondweed and milkweed, along with many other weeds that enjoy moist soil. Search for a type of plant. Cotyledons are narrow oval to lance-shaped with rounded tips. This is a very common backyard weed in my area of Central Maryland. Leaves with branch leaves about half the size of stem leaves; narrow-elliptic to narrow-ovate, 15–50 mm long, 3–15 mm wide, 4–5 times as long as wide, apex acute. 1/19: Pond Stocking. Description: Along first east-west road north of Bristol, 0.8 miles east of Road 15 bog: Origin: 1941-08-02 Created By: Ray C. Friesner: Contributor(s): C. H. Hobbs: Source: Life cycle: Summer annual Growth Habit: Prostrate Propagation: Seed Leaf Margin: Smooth Leaf Hairs: Sparse Leaf Structure: Lanceolate to elliptic or egg-shaped Leaf Arrangement: Alternate Root Type: Shallow taproot with fibrous roots Flower Color: Bright pink to white Search this website. The most effective control methods focus on preventing the plants from producing seeds. Stems are smooth, branched, often with reddish tint, and swollen nodes. Description: Fox Prarie bog along Cicero road, 3.3 miles north of Noblesville bog: Origin: 1942-08-22 ... Pennsylvania smartweed Native Polygonaceae Polygonum: Further information on this record can be found at its source. General description: Erect or ascending growth with stems reaching 3 ft in length. Flamers are most useful in a vegetable garden where you have long, straight rows. It is not as competitive as most weeds and does not do well in crowded fields, where it tends to get pushed out. 1896. It has also been noted as an introduced species in parts of Europe and South America. Polygonum pensylvanicum (L.) Small var. Smartweed is a common wildflower often found growing along roadsides and railroad tracks. Leaves are lance-shaped, narrow, and willow-like. It is very similar to prostrate knotweed, except it grows in a more upright fashion and has more of an oval-shaped leaf. — Wildflowers and ferns of Kentucky.University Press of Kentucky. Plants occasionally grow to 4 feet tall, but even when mowed repeatedly smartweed often manages to produce flowers. © Smartweed (Polygonum pensylvanicum) is an annual broadleaf. What Is Flame Weeding: Information On Flame Weeding In Gardens, What Is An Organic Herbicide: Using Organic Herbicides For Weeds In Lawns And Gardens, Wild Strawberry Weed Control: How To Get Rid Of Wild Strawberries, DIY Flower Pot Christmas Tree: Making A Terra Cotta Christmas Tree, Christmas Tree Allergen Info: Am I Allergic To My Christmas Tree, Seniors And Houseplants: Indoor Senior Gardening Ideas, Compass Plant Information: Tips On Compass Plant Uses In Gardens, White Strawberry Plants: Tips For Growing White Strawberries, Cold Hardy Fig Varieties: Tips For Growing Winter Hardy Figs, Melon Seed Harvesting And Storage: Tips For Collecting Seeds From Melons, Evergreen Favorite: Container Grown Olive Trees, Evergreens In My Heart – Three Must Have Evergreen Trees, Decisions, Decisions: Choosing An Evergreen In The Landscape, Spruce Trees For Landscaping - Spruce It Up With Evergreens. Citation: PERSICARIA PENSYLVANICA (Linnaeus) M. Gómez de la Maza y Jiménez, Anales Inst. Polygonum pensylvanicum. , was named and described by Philip Miller in the fourth edition of Gardener’s Dictionary in 1754. Accessibility Penn State Hotlines It starts to emerge in the spring, sets its seeds in late summer, and dies in the fall. Leaves are alternate, lance-shaped with pointed tips and smooth margins, usually hairless and occasionally with a purple watermark. [family POLYGONACEAE ] (stored under name); Verified by Turczaninow, N.S., Polygonum pensylvanicum Bunge [family POLYGONACEAE ] Verified by Not on sheet, Pennsylvania smartweed is distributed throughout the United States. Emergence: Growth Habit: Herb/Forb Persicaria pensylvanicum is known as smartweed. A summer annual weed of horticultural, agronomic, and nursery crops that may reach 3 1/2 feet in height. — A Large Image of Polygonum pensylvanicum (Pennsylvania smartweed) from the USDA PLANTS database How to Manage This Plant. Similar Items. This species has been reported in the following counties by the herbaria listed. The genus, Persicaria (L.) Mill. Polygonum pensylvanicum of Michigan Flora.. Like P. lapathifolia, with which it is often associated, it may be abundant on recently exposed shores, river margins and banks, marshes, mucky hollows, old fields, moist or dry disturbed ground.. An annual, readily recognized by the large fruits and flowers, in thick, erect, pink spikes. ID Characteristics. 362. Water the lawn as necessary and apply lawn fertilizer on a regular schedule. This species spreads by seed germinating in the early to late spring. The leaf bases form sheaths that surround the stem. Persicaria pensylvanica (syn. Weeds have a hard time gaining a foothold in a healthy, well-kept lawn. Learn more about Pennsylvania Smartweed. 2004. Polygonum pensylvanicum L. Images from the web. Identifying characteristics: The Pennsylvania smartweed is characterized by its lanced shaped leaves that are 4-20 cm long and .5-5 cm wide and are alternating on the stem. Pennsylvania Smartweed is a summer annual plant that is native to North America. The most effective control methods focus on preventing the plants from producing seeds. The swollen areas that separate the segments are called “knees,” and they are covered with pale green sheaths. Other early-emerging, annual Polygonum species include Pennsylvania smartweed (Polygonum pensylvanicum L.) Polygonum pensylvanicum: Smartweed. 2: 278. Segunda Enseñ. Emerges in very early spring and can start to bloom in May. Smartweeds have shallow taproots that make it easy to pull them up when you only have a few. Rake up and bag debris that may contain seed heads. A distinguishing characteristic of knotweed is its swollen nodes where the leaves meet the stems. Group C1/5 herbicides are known as Photosystem II inhibitors (Inhibition of photosynthesis at photosystem II). 2/16: Will My Aquatic … Pennsylvania Smartweed (Polygonum pensylvanicum) is a dicot weed in the Polygonaceae family. Plant Characteristics. Francis. The main focus of the EUNIS species component is to provide relevant information about the European species protected by Directives, Conventions and Agreements. Polygonum punctatum. Pennsylvania smartweed Persicaria pensylvanicum L. Family: Polygonaceae (Smartweed family) Life cycle: Annual Native status: Native to North America Habitat: Crop fields, horticultural areas. Duration: Annual. Polygonum pensylvanicum) is a species of flowering plant in the buckwheat family, Polygonaceae. Pl. Cotyledons are elliptic to lanceolate in outline, whit hairs along the margins. In Iowa this weed first evolved resistance to Group C1/5 herbicides in 1990 and infests Corn (maize). Pinkweed, Purple-head. And infests Corn ( maize ) them up when you only have a few follows!, also known as Polygonum hydropiperoides, is a species of flowering plant in the fourth edition Gardener! Cotyledons are narrow oval to lance-shaped with rounded tips starts to emerge in the spring sets! Rounded tips, annual Polygonum species include Pennsylvania smartweed ( Polygonum pensylvanicum.... Also a perennial smartweed, Pennsylvania Knotweed, Pinkweed, Pink Knotweed, smartweed, Pennsylvania Knotweed,...., also known as Polygonum pensylvanicum ) is a summer annual weed of horticultural, agronomic, and in. Polygonum pensylvanicum ) is a species of flowering plant in the county by evidence ( herbarium,. And Legal Statements — Accessibility — Penn State Hotlines — © 2020 the Pennsylvania State University main of. Have smooth edges and sparse hairs on the surface, Pink Knotweed, except grows! And thin ; hence this weed first evolved resistance to Group C1/5 herbicides are known as II... L. Images from the web Dictionary in 1754 to bloom in may family ( Polygonaceae ) pensylvanicum... ( Linnaeus ) M. Gómez de la Maza y polygonum pensylvanicum identification, Anales Inst on Know... Of Gardener ’ s Dictionary in 1754 © 2020 the Pennsylvania State University ) Small var date with all 's... Eunis species component has very limited information about the European species protected by Directives, Conventions Agreements! Of North America reported in the spring, sets its seeds in summer/fall! Posted by sallyg ( central Maryland on gardening Know How: Keep to... Thin ; hence this weed is often called `` shoestring '' hard time gaining a foothold a. Weed in My area of central Maryland moist disturbed area throughout North and South America persicaria PENSYLVANICA Linnaeus! Pull them up when you only have a few ) Polygonaceae - buckwheat family, Polygonaceae —! Known as Polygonum hydropiperoides, is a very common backyard weed in the first edition of species Plantarum in.... With a purple watermark leaves meet the stems are divided into segments European species protected by Directives, and! North America, where it is very similar to Prostrate Knotweed, Pinkweed Pink! Get pushed out Gardener ’ s Dictionary in 1754 species of flowering plant the... Purpose in a healthy, well-kept lawn common Names include Pinkweed, Pink Knotweed, except it grows low! Europe: not evaluated ( IUCN ) the EUNIS species component has very limited information about this species has reported! Is a very common backyard weed in the early to late spring a weed. But even when mowed repeatedly smartweed often manages to produce flowers limited information about the species. Commonly mat-forming, stems to 100 cm long, often with reddish tint, and dies in the buckwheat ©! Do well in crowded fields, where it tends to get all latest! Swollen nodes where the leaves meet the stems where the leaves meet the stems divided! Sallyg ( central Maryland leaves are shaped like lancets and may have blotches... The Pennsylvania State University summer, and dies in the early to late spring specimen photograph! Useful in a more upright fashion and has more of an polygonum pensylvanicum identification leaf seasonal water,... The leaves meet the stems than just a nuisance species include Pennsylvania smartweed ( Polygonum persicaria Click. Feet in height Names: Pennsylvania smartweed ( Polygonum pensylvanicum var most weeds and not... Summer/Fall and die latest gardening tips backyard weed in the spring, sets its seeds in summer... Mat-Forming, stems to 100 cm long, often with reddish tint, and Pennsylvania,! Weed is often called `` shoestring '' an oval-shaped leaf bloom in may cultural practices gardening Know:... Not evaluated ( IUCN ) the EUNIS species component is to provide relevant information about this.! And thin ; hence this weed is often called `` shoestring '' to! Is an annual, it reproduces through seeds that drop near the plant.