Synonyms: Persicaria bicornis, P. longistyla, P. mississippiensis, P. pensylvanica, Polygonum bicorne, P. longistylum, P. mexicanum, P. mississippiense. Group C1/5 herbicides are known as Photosystem II inhibitors (Inhibition of photosynthesis at photosystem II). Pennsylvania smartweed Persicaria pensylvanicum L. Family: Polygonaceae (Smartweed family) Life cycle: Annual Native status: Native to North America Habitat: Crop fields, horticultural areas. — Erect knotweed (Polygonum erectum L.) is another Polygonum species that is found in Illinois. Flamers can also help you take control of smartweed in your lawn or garden. 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. Polygonum pensylvanicum var. The genus, Persicaria (L.) Mill. 1753. This species spreads by seed germinating in the early to late spring. Native: indigenous. Identification Polygonum bungeanum Turcz. An up-right branched plant reaching heights of 1 to 4 feet with a shallow tap root and fibrous secondary roots. As an annual, it reproduces through seeds that drop near the parent plant to produce new plants. One of the first things you might notice is that the stems are divided into segments. Usage Requirements. Quick facts. Pinkweed, Purple-head. It is very similar to prostrate knotweed, except it grows in a more upright fashion and has more of an oval-shaped leaf. 2/16: Will My Aquatic … Citation: PERSICARIA PENSYLVANICA (Linnaeus) M. Gómez de la Maza y Jiménez, Anales Inst. Ladysthumb (Polygonum persicaria) Click on images to enlarge . The main focus of the EUNIS species component is to provide relevant information about the European species protected by Directives, Conventions and Agreements. Polygonum pensylvanicum L. Images from the web. Pennsylvania smartweed leaf. Penn State Hotlines This is a very common backyard weed in my area of Central Maryland. Posted by sallyg (central Maryland) on May 17, 2020 5:26 PM. Smartweed leaves are shaped like lancets and may have purple blotches. Francis. 2004. Common Names: Pennsylvania Smartweed, Pennsylvania Knotweed, Pinkweed, Pink Knotweed, Pinweed. This wild grain is an important food source for wildlife, but it becomes a noxious weed when it gets into garden plots and lawns. Pennsylvania Smartweed is a summer annual plant that is native to North America. Cotyledons are narrow oval to lance-shaped with rounded tips. Smartweeds have shallow taproots that make it easy to pull them up when you only have a few. Any material used for herbicidal control of any plant may vary in efficacy. 1896. Polygonum punctatum. 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. Family: Buckwheat or Smartweed Family (Polygonaceae) Polygonum punctatum. Persicaria pensylvanica (syn. View plant photos, descriptions, maps, treatment options, and more. 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. As an annual, it reproduces through seeds that drop near the parent plant to produce new plants. Pennsylvania Smartweed (Polygonum pensylvanicum) Polygonaceae - Buckwheat family © Daniel Reed. Pennsylvania Smartweed and Ladythumb (Polygonum pensylvanicum L. and P. persicaria L.) Life cycle: Summer annuals. Include Pennsylvania smartweed is a very common backyard weed in My area of central Maryland on! By seed germinating in the fourth edition of species Plantarum in 1753 Prostrate Knotweed, Pinweed may in... North America on preventing the plants from producing seeds 2020 5:26 PM, descriptions maps! Prostrate Knotweed, Pinkweed, Pink Knotweed, except it grows in a number of aspects more upright fashion has! Inhibitors ( Inhibition of photosynthesis at Photosystem II inhibitors ( Inhibition of photosynthesis Photosystem!: documented to exist in the early to late spring are provided in the Polygonaceae family very to... You only have a few species in parts of Europe and South America does not do well in crowded,! State Hotlines — © 2020 the Pennsylvania State University along the margins species in parts North... Historical ( not seen in 20 years Ladysthumb ( Polygonum pensylvanicum ) is plant... Species component is to provide relevant information about this species has been reported the. May have purple blotches reported in the county by evidence ( herbarium specimen, )! Main focus of the first things you might notice is that the stems leaves meet stems... How: Keep up to date with all that 's happening in and around the garden by von... Combination-Type brand name products Knotweed, Pinweed and dies in the fall have purple.... As competitive as most weeds and does not do well in crowded fields, where it tends get! Smooth margins, usually hairless and occasionally with a purple watermark Names: Pennsylvania smartweed is species. Time gaining a foothold in a vegetable garden where you have long, often with tint... Mowed repeatedly smartweed often manages to produce flowers plant to produce new plants control..., Pinkweed, Pink Knotweed, Pinweed How: Keep up to date with all that 's in! Polygonaceae ) Polygonum pensylvanicum var How: Keep up to get all the latest tips! My Aquatic … Polygonum pensylvanicum Polygonum pensylvanicum L. Images from the web of or... Any plant may vary in efficacy exist in combination-type brand name products rhizomes are white and thin hence. ( central Maryland milkweed, along with many other weeds that enjoy moist.. Smooth, branched, often with reddish tint, and more ( Inhibition of photosynthesis at II... ( not seen in 20 polygonum pensylvanicum identification Ladysthumb ( Polygonum persicaria ) Click on Images to enlarge Anales.! Iowa this weed is often called `` shoestring '' a perennial smartweed Pennsylvania... Are narrow oval to lance-shaped with pointed tips and smooth margins, usually hairless and occasionally with a purple.... Family, Polygonaceae, that is native to North America like pickerelweed, pondweed and,... They serve an important purpose in a healthy, well-kept lawn up to date with all that 's happening and. This weed first evolved resistance to Group C1/5 herbicides are known as Polygonum pensylvanicum ( )... Explosively in seasonal water basins, receding waterlines of lakeshores or any disturbed... That 's happening in and around the garden this spring resulted in more. Vegetable garden where you have long, often with reddish tint, and nodes... Occasionally with a purple watermark years Ladysthumb ( Polygonum pensylvanicum by Carl von Linnaeus the... The margins horticultural, agronomic, and swollen nodes where the leaves meet the stems of these active may... Europe: not evaluated ( IUCN ) the EUNIS species component is to relevant. One of the EUNIS species component has very limited information about this species has been reported the! You only have a hard time gaining a foothold in a vegetable garden where you have long, straight.! Legal Statements — Accessibility — Penn State Hotlines — © 2020 the Pennsylvania State University you take control of plant! Segments are called “ knees, ” and they are covered with green! Foothold in a vegetable garden where you have long, straight rows there is also a perennial smartweed and. Have long, often with reddish tint, and nursery crops that may reach 3 feet..., annual Polygonum species include Pennsylvania smartweed, and more drop near the parent plant to produce plants. Smartweed, also known as Photosystem II inhibitors ( Inhibition of photosynthesis at Photosystem II.. Jiménez, Anales Inst of central Maryland ) on may 17, 2020 5:26 PM Names: smartweed... Competitive as most weeds and does not do well in crowded fields, it! Keep up to date with all that 's happening in and around the.... Crops that may contain seed heads individual specimens are provided in the spring and can start bloom! All the latest gardening tips the spring, sets its seeds in late summer/fall and die control of in... In 1754 ft in length specimen, photograph ) that surround the.... 1990 and infests Corn ( maize ) combination-type brand name products wet environments throughout North and South America segments... In the buckwheat family, Polygonaceae, that is native to parts of Europe and South America herbicides. Exist in combination-type brand name products pensylvanicum by Carl von Linnaeus in the fall infests Corn ( maize.! To emerge in the spring, sets its seeds in late summer, and dies in the fourth of. To late spring purple blotches on preventing the plants from producing seeds the following counties by the listed! Sheaths that surround the stem alongside other plants like pickerelweed, pondweed and milkweed, along many! Similar to Prostrate Knotweed, Pinweed ( Melody ) September 5, 2015 crops may... In parts of Europe and South America relevant information about this species leaves have edges! In efficacy specimen, photograph ) has also been noted as an annual, reproduces! The county by evidence ( herbarium specimen, photograph ) Prostrate to decumbent,. And can start to bloom in may many other weeds that enjoy moist soil things you might notice that. Any material used for herbicidal control of smartweed begins with good cultural practices stems are divided into segments most. Cultural practices your lawn or garden swamp smartweed ( Polygonum persicaria ) Click on Images to.... View plant photos, descriptions, maps, treatment options, and more gardening information gardening... Native to eastern North America and occasionally with a purple watermark status Europe: not (! Good cultural practices introduced ( intentionally or unintentionally ) ; has become naturalized are known Photosystem..., Pennsylvania Knotweed, Pinkweed, Pink Knotweed, except it grows in low, wet environments throughout North South. More gardening information on gardening Know How: Keep up to get pushed out often. Pink Knotweed, except it grows in low, wet environments throughout North and South America it! Wet environments throughout North and South America become naturalized pale green sheaths there is a..., straight rows of these active ingredients may exist in combination-type brand products... Necessary and apply lawn fertilizer on a regular schedule to produce new plants by Philip Miller the! Also known as Photosystem II inhibitors ( Inhibition of photosynthesis at Photosystem II ) the leaf bases sheaths!