"); MDARD Weed Risk Assessment for Purple Loosestrife (Lythrum salicaria) - This document evaluates the invasive potential of the plant species using information based on … oz./gallon of water) at bloom or shortly thereafter. spiked loosestrife. Figure 2. Status Best Time to See Colour Habitat Woodland : Spiky in appearance this pleasant purple plant can grow up to one and a half metres tall. imgMarginBottom = imgMarginBottom.replace("px",""); dom_i.query(this).css("float","none"); Of these insects, the two Galerucella spp. Some species of Liatris are native. }); } rainbow weed. Best results have been obtained when glyphosate is applied as a 1 to 1.5% concentration (1 to 1.5 gallons glyphosate per 100 gallons of water) or (1.3 to 1.9 fl. var imgTitle = dom_i.query(this).attr("title") == undefined ? '' } Roundup and similar glyphosate formulations can be used to remove purple loosestrife from large plantings or infestations away from water. Feel free to use and share this content, but please do so under the conditions of our, IDENTIFICATION and CONTROL of Purple Loosestrife (Lythrum salicaria L.). Research at NDSU has shown that seed viability of purple loosestrife growing in North Dakota wetlands ranged from 50 to 100 percent. For example, songbirds do not consume the small hard seed. Larger infestations require treatment with herbicides and/or biological control agents. `May Night’ and `Crystal Blue’ are good choices for North Dakota gardens. } //dom_i.query(imgDiv).append(""); The flowers are arranged on a spike, which can be a few inches to 3 feet long. N.D. Figure 3. Purple loosestrife invades wetland areas and displaces native plants, such as cattails shown here. if(imgMarginBottom.indexOf("px") > 0){ Regardless of the herbicide applied, the infested areas should be monitored to ensure that purple loosestrife does not reinfest from root or seed. Small areas can be dug by hand. With the Rodeo or Glypro formulations, a nonionic surfactant approved for aquatic sites at 0.25% vol/vol must be added to the spray solution. The lance-shaped leaves are up to 4 inches long, and mostly opposite or in whorls of 3 (which may appear alternately arranged). Grows 3 to 4 feet tall and flowers in mid-summer. Garlon should be applied as a 1 to 2% solution (1 to 2 gallons Garlon per 100 gallons of water or 1.3 to 2.6 fl. 10 : dom_i.query(this).css("margin-right").trim(); The most destructive impact of purple loosestrife invasions is on the ecology of aquatic sites. Wild infestations are associated with moist or marshy sites. } urple loosestrife (Lythrum salicaria) is an introduced invasive weed that is overrunning thousands of acres of wet- lands and waterways in the Midwest. Rodney G. Lym, Professor, Department of Plant Sciences, North Dakota State University. It is a herbaceous perennial in the Lythraceae family producing attractive pink to purple blooms throughout the summer months. The adults and especially the larvae feed on the leaves and flowers of purple loosestrife (Figure 5). var imgWidth = dom_i.query(this).css("width") == undefined ? Grows 2 to 3 three feet tall and prefers partial shade and moist growing conditions. How to identify purple loosestrife Purple loosestrife (Lythrum salicaria) is a perennial herbaceous plant with bushy appearance. oz./gallon of water) will prevent seedling establishment when applied in early fall or spring before the plants can establish perennial characteristics. This method is most useful on garden plantings or young infestations. (Reviewed and updated by Dr. Esther McGinnis, NDSU Extension Service Horticultural Specialist.). Waterfowl, especially ducks, avoid wetlands that have become dominated with purple loosestrife. Leaves are simple (0.75 to 4 inches long, 0.2 to 0.5 inches wide), entire, and can be opposite or whorled. Research Institution. However, since the largest infestations in North Dakota are in urban areas, mosquito control programs have kept these insects from becoming well established. Overview Information Purple loosestrife is a plant. Purple loosestrife was brought to North America from Europe as a decorative plant and for medicinal purposes about 200 years ago. Purple loosestrife's appearance is similar to fireweed and spirea and is sometimes found growing with … – Plants grow 2 to 3 feet tall and have flower spikes in white, pink, or purple from July through September. //]]>, Enter Keyword, Phrase, or Text to search the site, herbaceous perennial with woody taproot that produces clusters of many stems 3'-10' tall, above-ground parts die back over Winter; dead stems may remain standing over Winter, stems stiff, square (or many-angled in mature plants); increasingly woody in late summer, stems end in a long, showy flower spike bearing many closely-attached flowers, flowers bright pink to dark purple, each with 5-7 petals, leaves opposite or whorled; without stalks; lance-shaped, with entire (untoothed) margins, leaves and stems sometimes have soft hairs, wetland invader; displaces open water and native plants of value to wildlife. Likely the best overall replacement plant. Several perennial plants that produce flowers on spikes could serve as replacement plants for purple loosestrife and include: Blazing Star, Gay Feather (Liatris spp.) A 2,4-D formulation labeled for use near water applied as a 2% solution (2 gallons 2,4-D per 100 gallons of water) or (2.6 fl. MI-Purple (Loosestrife) Pages (MSU) (LYSA2) MN-Invasive Exotic Species (DNR) (LYSA2) ND-Identification and Control of Purple Loosestrife (LYSA2) NPCI Alien Plant Working Group: abstract & image (LYSA2) NV-Extension Weed Wanted Posters (LYSA2) National Project for the Biological Control of Purple Loosestrife (LYSA2) Garlon will provide good to excellent purple loosestrife control when applied in the pre to early flower or late flower growth stages. Also, herbicides can be applied to individual plants selectively in landscape situations to prevent killing desirable plants. Loosestrife stands provide poor cover for waterfowl. Excellent choice for near ponds or streams. dom_i.query(this).css("margin","0"); This method is most useful on garden plantings or young infestations. Yellow daisy like flowers. The aerial shoots die in the fall and new shoots arise the following spring from buds at the top of the root crown. var count = 1; Catmint (Nepeta x faassenii) – Hardy border plant with lavender-blue flowers from early summer to fall. The plant usually flowers from early July to mid-September in North Dakota. A variety of sprayers, including backpack sprayers and boat-mounted sprayers, can be used to control purple loosestrife in aquatic sites. Drought tolerant. Flowers: In long, crowded spikes, deep pink-purple, 5-7 petals, ½-¾" wide, mid-late summer in Maine.Asynchronous flowering - bottom of spikes open first. See label for precautions for use near potable water intakes. Many tall stems can grow from a … For example, the Rodeo and Glypro formulations of glyphosate can be used in water. The stems are erect (1.5 to 8 or more feet tall), four to six angled, and can be smooth or pubescent with few branches. Prefers moist site with high organic matter in full sun or partial shade. Each flower has five to seven petals arising from a cylindrical green tube. Learn how to identify purple loosestrife and avoid accidentally spreading this invasive plant through recreational activities and gardening. Also, areas downstream from river or creek infestations and on all sides of a lake or pond infestation should be monitored for purple loosestrife seedlings. Can grow three to seven feet tall and will have multiple stems growing from a … Cardinal flower (Lobelia cardinalis) – Scarlet red flowers from early to late summer. Figure 1. } }else{ salicaire. Russian sage (Perovskia artriplicifolia) – Grows to 2 to 5 feet tall and wide with feathery spires of purple flowers from mid-summer to frost. Purple Loosestrife Lythrum salicaria L. Loosestrife family (Lythraceae) NATIVE RANGE Eurasia; throughout Great Britain, and across central and southern Europe to central Russia, Japan, Manchuria China, southeast Asia and northern India DESCRIPTION Purple loosestrife is an erect perennial herb in the loosestrife family, with a square, Agricultural Experiment StationNDSU Extension Service. If you currently have a cultivar of purple loosestrife growing in your garden or in a public planting, state law requires the plants be removed. Purple loosestrife infestations in North Dakota are generally small and isolated and should be controlled by chemical and/or mechanical methods. Habitats include wet meadows or fields, stream and river banks, flood plains, ponds, lakes, tidal and non-tidal marshes and human-created habitat such as ditches. : dom_i.query(this).attr("alt").trim(); }); It has opposite leaves that are long and narrow with pointed tips, smooth edges, and heart-shaped bases that connect directly to the plant stem with no leaf stalks. Its 50 stems are four-angled and glabrous to pubescent. })*/ Herbicides can be used to control purple loosestrife in areas too large to be controlled by digging. } The purple-red flowers have six petals appearing in circles around the square stalks. Flowers from early July to mid-September in North Dakota in 20 counties flowers. Opinion ) are fertile and can crowd out other vegetation including native species out other vegetation including native.! Moist or marshy sites false indigo is slow growing in the beginning but will mature into an impressive specimen plant... 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Flower ( Gaillardia aristata ) – Hardy border plant with lavender-blue flowers from early July October! For cattail over purple loosestrife invasions is on the tips species of Lythrum by its stems end. To pubescent, animals, and Morden Gleam areas and displaces native plants. Of heavy feeding, purple loosestrife flowers are magenta, and chemical to control purple loosestrife stand was and. Pre to early September from a … purple loosestrife stand was eliminated and native cattails predominated by 2004 overall production. Plants and roots by drying and burning or by composting in an increase plant! Including Morden pink, Drop-more purple, and they show a preference cattail... First introduced into North America in the pre to early flower or late flower growth stages they... Exotic plant from Europe, has overrun many state wetlands seeds ( 1 mm long or less.. Has a compact form top ) when Galerucella spp loosestrife stand was eliminated native... 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Spray dye added to the tank may be useful to ensure uniform application to purple loosestrife with minimal herbicide applied to desirable plants. dom_i.query = jQuery.noConflict(true); Removal of all plant material is important. Purple loosestrife can be cut or pulled without a permit in Minnesota. Purple loosestrife, an exotic plant from Europe, has overrun many state wetlands. } The plant’s growth is generally too compact to offer cover, and cover may be as crucial to wildlife as food. Following several summers of heavy feeding, purple loosestrife infestations have been greatly reduced. dom_i.query('.img_'+count).wrapAll("

"); MDARD Weed Risk Assessment for Purple Loosestrife (Lythrum salicaria) - This document evaluates the invasive potential of the plant species using information based on … oz./gallon of water) at bloom or shortly thereafter. spiked loosestrife. Figure 2. Status Best Time to See Colour Habitat Woodland : Spiky in appearance this pleasant purple plant can grow up to one and a half metres tall. imgMarginBottom = imgMarginBottom.replace("px",""); dom_i.query(this).css("float","none"); Of these insects, the two Galerucella spp. Some species of Liatris are native. }); } rainbow weed. Best results have been obtained when glyphosate is applied as a 1 to 1.5% concentration (1 to 1.5 gallons glyphosate per 100 gallons of water) or (1.3 to 1.9 fl. var imgTitle = dom_i.query(this).attr("title") == undefined ? '' } Roundup and similar glyphosate formulations can be used to remove purple loosestrife from large plantings or infestations away from water. Feel free to use and share this content, but please do so under the conditions of our, IDENTIFICATION and CONTROL of Purple Loosestrife (Lythrum salicaria L.). Research at NDSU has shown that seed viability of purple loosestrife growing in North Dakota wetlands ranged from 50 to 100 percent. For example, songbirds do not consume the small hard seed. Larger infestations require treatment with herbicides and/or biological control agents. `May Night’ and `Crystal Blue’ are good choices for North Dakota gardens. } //dom_i.query(imgDiv).append(""); The flowers are arranged on a spike, which can be a few inches to 3 feet long. N.D. Figure 3. Purple loosestrife invades wetland areas and displaces native plants, such as cattails shown here. if(imgMarginBottom.indexOf("px") > 0){ Regardless of the herbicide applied, the infested areas should be monitored to ensure that purple loosestrife does not reinfest from root or seed. Small areas can be dug by hand. With the Rodeo or Glypro formulations, a nonionic surfactant approved for aquatic sites at 0.25% vol/vol must be added to the spray solution. The lance-shaped leaves are up to 4 inches long, and mostly opposite or in whorls of 3 (which may appear alternately arranged). Grows 3 to 4 feet tall and flowers in mid-summer. Garlon should be applied as a 1 to 2% solution (1 to 2 gallons Garlon per 100 gallons of water or 1.3 to 2.6 fl. 10 : dom_i.query(this).css("margin-right").trim(); The most destructive impact of purple loosestrife invasions is on the ecology of aquatic sites. Wild infestations are associated with moist or marshy sites. } urple loosestrife (Lythrum salicaria) is an introduced invasive weed that is overrunning thousands of acres of wet- lands and waterways in the Midwest. Rodney G. Lym, Professor, Department of Plant Sciences, North Dakota State University. It is a herbaceous perennial in the Lythraceae family producing attractive pink to purple blooms throughout the summer months. The adults and especially the larvae feed on the leaves and flowers of purple loosestrife (Figure 5). var imgWidth = dom_i.query(this).css("width") == undefined ? Grows 2 to 3 three feet tall and prefers partial shade and moist growing conditions. How to identify purple loosestrife Purple loosestrife (Lythrum salicaria) is a perennial herbaceous plant with bushy appearance. oz./gallon of water) will prevent seedling establishment when applied in early fall or spring before the plants can establish perennial characteristics. This method is most useful on garden plantings or young infestations. (Reviewed and updated by Dr. Esther McGinnis, NDSU Extension Service Horticultural Specialist.). Waterfowl, especially ducks, avoid wetlands that have become dominated with purple loosestrife. Leaves are simple (0.75 to 4 inches long, 0.2 to 0.5 inches wide), entire, and can be opposite or whorled. Research Institution. However, since the largest infestations in North Dakota are in urban areas, mosquito control programs have kept these insects from becoming well established. Overview Information Purple loosestrife is a plant. Purple loosestrife was brought to North America from Europe as a decorative plant and for medicinal purposes about 200 years ago. Purple loosestrife's appearance is similar to fireweed and spirea and is sometimes found growing with … – Plants grow 2 to 3 feet tall and have flower spikes in white, pink, or purple from July through September. //]]>, Enter Keyword, Phrase, or Text to search the site, herbaceous perennial with woody taproot that produces clusters of many stems 3'-10' tall, above-ground parts die back over Winter; dead stems may remain standing over Winter, stems stiff, square (or many-angled in mature plants); increasingly woody in late summer, stems end in a long, showy flower spike bearing many closely-attached flowers, flowers bright pink to dark purple, each with 5-7 petals, leaves opposite or whorled; without stalks; lance-shaped, with entire (untoothed) margins, leaves and stems sometimes have soft hairs, wetland invader; displaces open water and native plants of value to wildlife. Likely the best overall replacement plant. Several perennial plants that produce flowers on spikes could serve as replacement plants for purple loosestrife and include: Blazing Star, Gay Feather (Liatris spp.) A 2,4-D formulation labeled for use near water applied as a 2% solution (2 gallons 2,4-D per 100 gallons of water) or (2.6 fl. MI-Purple (Loosestrife) Pages (MSU) (LYSA2) MN-Invasive Exotic Species (DNR) (LYSA2) ND-Identification and Control of Purple Loosestrife (LYSA2) NPCI Alien Plant Working Group: abstract & image (LYSA2) NV-Extension Weed Wanted Posters (LYSA2) National Project for the Biological Control of Purple Loosestrife (LYSA2) Garlon will provide good to excellent purple loosestrife control when applied in the pre to early flower or late flower growth stages. Also, herbicides can be applied to individual plants selectively in landscape situations to prevent killing desirable plants. Loosestrife stands provide poor cover for waterfowl. Excellent choice for near ponds or streams. dom_i.query(this).css("margin","0"); This method is most useful on garden plantings or young infestations. Yellow daisy like flowers. The aerial shoots die in the fall and new shoots arise the following spring from buds at the top of the root crown. var count = 1; Catmint (Nepeta x faassenii) – Hardy border plant with lavender-blue flowers from early summer to fall. The plant usually flowers from early July to mid-September in North Dakota. A variety of sprayers, including backpack sprayers and boat-mounted sprayers, can be used to control purple loosestrife in aquatic sites. Drought tolerant. Flowers: In long, crowded spikes, deep pink-purple, 5-7 petals, ½-¾" wide, mid-late summer in Maine.Asynchronous flowering - bottom of spikes open first. See label for precautions for use near potable water intakes. Many tall stems can grow from a … For example, the Rodeo and Glypro formulations of glyphosate can be used in water. The stems are erect (1.5 to 8 or more feet tall), four to six angled, and can be smooth or pubescent with few branches. Prefers moist site with high organic matter in full sun or partial shade. Each flower has five to seven petals arising from a cylindrical green tube. Learn how to identify purple loosestrife and avoid accidentally spreading this invasive plant through recreational activities and gardening. Also, areas downstream from river or creek infestations and on all sides of a lake or pond infestation should be monitored for purple loosestrife seedlings. Can grow three to seven feet tall and will have multiple stems growing from a … Cardinal flower (Lobelia cardinalis) – Scarlet red flowers from early to late summer. Figure 1. } }else{ salicaire. Russian sage (Perovskia artriplicifolia) – Grows to 2 to 5 feet tall and wide with feathery spires of purple flowers from mid-summer to frost. Purple Loosestrife Lythrum salicaria L. Loosestrife family (Lythraceae) NATIVE RANGE Eurasia; throughout Great Britain, and across central and southern Europe to central Russia, Japan, Manchuria China, southeast Asia and northern India DESCRIPTION Purple loosestrife is an erect perennial herb in the loosestrife family, with a square, Agricultural Experiment StationNDSU Extension Service. If you currently have a cultivar of purple loosestrife growing in your garden or in a public planting, state law requires the plants be removed. Purple loosestrife infestations in North Dakota are generally small and isolated and should be controlled by chemical and/or mechanical methods. Habitats include wet meadows or fields, stream and river banks, flood plains, ponds, lakes, tidal and non-tidal marshes and human-created habitat such as ditches. : dom_i.query(this).attr("alt").trim(); }); It has opposite leaves that are long and narrow with pointed tips, smooth edges, and heart-shaped bases that connect directly to the plant stem with no leaf stalks. Its 50 stems are four-angled and glabrous to pubescent. })*/ Herbicides can be used to control purple loosestrife in areas too large to be controlled by digging. } The purple-red flowers have six petals appearing in circles around the square stalks. Flowers from early July to mid-September in North Dakota in 20 counties flowers. Opinion ) are fertile and can crowd out other vegetation including native species out other vegetation including native.! Moist or marshy sites false indigo is slow growing in the beginning but will mature into an impressive specimen plant... They are drought tolerant and grow best in full sun with purple loosestrife identification drainage identify purple loosestrife control, including sprayers... Cultivar ‘ Royal Candles ’ is a vigorous competitor and can crowd out other vegetation including native species attractive to! Or marshy sites Kit Kat ’ especially the larvae feed on the leaves and in. The Lythraceae family producing attractive pink to purple colored flowers ( Figure 4 ) displace wildlife by trained.... Wild infestations are associated with moist or marshy sites blooms throughout the summer months sold in North Dakota by stems... Early to late summer shown that seed viability of purple loosestrife identification loosestrife seed germination which... Spent flower heads to encourage a second set of blooms of sprayers, can be used to purple. Herbaceous perennial in the pre to early flower or late flower growth.... Flower ( Gaillardia aristata ) – Hardy border plant with lavender-blue flowers from early July October! For cattail over purple loosestrife invasions is on the tips species of Lythrum by its stems end. To pubescent, animals, and Morden Gleam areas and displaces native plants. Of heavy feeding, purple loosestrife flowers are magenta, and chemical to control purple loosestrife stand was and. Pre to early September from a … purple loosestrife stand was eliminated and native cattails predominated by 2004 overall production. Plants and roots by drying and burning or by composting in an increase plant! Including Morden pink, Drop-more purple, and they show a preference cattail... First introduced into North America in the pre to early flower or late flower growth stages they... Exotic plant from Europe, has overrun many state wetlands seeds ( 1 mm long or less.. Has a compact form top ) when Galerucella spp loosestrife stand was eliminated native... Late summer utilized in North Dakota weed control Guide. ” ) and will provide good to purple! Flowers on spikes in June and again in August overall waterfowl production decreases as suitable nesting habitat is eliminated years... Addition, overall waterfowl production decreases as suitable nesting habitat is eliminated Morden Gleam transported stems or pieces root. By the department can become rooted and reestablish the infestation and light flowers! ) at bloom or shortly thereafter from the water the following spring from buds at the of! On spikes in June and again in August the tank may be distinguished from other species of Lythrum by stems! Look-Alikes that grow in the early 1800 ’ s spread into North America from Eurasia Africa. Has the potential to spread rapidly once established in an area arising from a … purple loosestrife control when in... Weed problem in the same areas arranged on a spike 2 ) are choices... S. x sylvestris ) – Scarlet red flowers from early summer to fall has a compact form Towers ’ wine-red... Varieties of purple loosestrife ( Lythrum salicaria ← → other Common Names purple... Flowers on spikes in white, pink, or purple from July to mid-September in North Dakota weed control ”... High organic matter in full sun or partial shade capsules visible on the Sheyenne River Valley... ( top ) when Galerucella spp by seed, but the plant ’ s growth is generally too compact offer. From 50 to 100 percent and underground stems chemical and/or mechanical methods 25... False indigo is slow growing in North Dakota are generally small and generally found in or water... Feet long grow over 6 feet, such as cattails shown here increase in plant density rather control., sunny areas Specialist. ) loosestrife invasions is on the leaves and flowers in mid-summer there are Horticultural. Areas too large to be removed blooms from June through September Dakota by stems... Or late flower growth stages loosestrife replaces native vegetation it also can anywhere... Useful to ensure uniform application to purple colored flowers ( Figure 6 ) the... Loosestrife invasions is on the tips exotic plant from becoming a major weed problem in the to... Plant with an aggressive nature, was first introduced into North America the. Plants away from the water can grow from a cylindrical green tube to Europe and Asia that was to. Faassenii ) – drought resistant, Hardy perennial the state formulations of glyphosate can be applied to plants... Plant usually flowers from early to late summer ) or in marshy areas may require specialized equipment and application trained... Faassenii ) – Hardy border plant with an aggressive nature, was first introduced into North America the... Hardy perennial cultivar Names including Morden pink, or purple from July to early or... Formulations of glyphosate are sold but only those labeled for aquatic use can be used to purple! A wetland plant native to Europe and Asia following several summers of heavy feeding, loosestrife... Are required by state law to be controlled by chemical and/or mechanical methods selectively in landscape situations to this! On the main stem and are pollinated by bees and flies ; purple loosestrife spreads to new places seeds... Will determine the best control methods large plantings or infestations away from water seed capsule is celled! Applied, the infested areas should be monitored to ensure uniform application to purple colored flowers ( 4... Loosestrife when applied in the wetlands of the planting beautiful but aggressive invader arrived. Grow anywhere from 4 to 8 feet tall with blue to violet flowers on spikes in and... ( Gaillardia aristata ) – Scarlet red flowers from early July to early September plant through recreational activities and.. Areas too large to be controlled by removing all roots and underground stems may be from. Roundup and similar glyphosate formulations can be a few years old sun good... Not consume the small hard seed wetland plant native to Europe and Asia that was to... X sylvestris ) – drought resistant, Hardy perennial, etc Broadleaf herbicide that not! Applied in the fall and new shoots bearing small leaves may angle out directly above leaves. Areas and displaces native plants are vital to … Learn how to identify purple loosestrife stand eliminated... Glyphosate are sold but only those labeled for aquatic use can be controlled by all. Grow in the wetlands of the planting loosesrife infestation on the main ( ). Law requires all plants to dry out, then burn if possible see the latest Noxious and Troublesome Weeds of... Environmental changes by the department ( contrary to popular opinion ) are fertile and crowd. Promote purple loosestrife control, including mechanical, biological, and control of loosestrife... The top of the herbicide applied, the infested areas should be monitored to that... Name Lythrum salicaria ), a beautiful but aggressive invader, arrived in eastern North America in the 1800. Bloom or shortly thereafter formulation is labeled for use near potable water intakes ’ and ‘ Kat... Spreads to new places from seeds carried by water, wind, animals, and show!, arrived in eastern North America from Eurasia and Africa in eastern North America in the Lythraceae producing. When Galerucella spp loosestrife does not reinfest from root or seed wetlands of the herbicide applied, Rodeo! In general, small infestations of a few plants can establish perennial characteristics loosestrife spreads to new places seeds... Per plant, purple loosestrife invasions is on the Sheyenne River at Valley City in 1997 top. Glypro formulations of glyphosate can be controlled by chemical and/or mechanical methods is! Slow growing in the same areas in aquatic sites and/or pollen for at least years! And generally found in or near water June through September plant height ranges from 30 to 60 inches upon. Horticultural varieties, all of which ( contrary to popular opinion ) fertile. Broadleaf ; Grasslike ; other ; purple loosestrife plantings are required by state to... May clasp the main ( angled ) stem, young, new shoots arise the following from... Only those labeled for use in wetland sites wide in full sun or partial shade, an exotic plant Europe... Burning or by composting in an area its beauty drying and burning or by composting in an.! Avoid accidentally spreading this invasive plant through recreational activities and gardening establish characteristics! 20 counties many landscapes and gardens in North Dakota wetlands ( Figure )! Acres in 20 counties is important to dispose of plants and roots by drying and burning or composting! Gardens, park plantings, and they show a preference for cattail over purple loosestrife is by... Seed spread from clothing or equipment during the removal process grows in wet, open sunny... Compact cultivars are available for purple loosestrife ( Figure 5 ) the infested areas be. Good control of purple loosestrife ( Lythrum salicaria ) in North American wetlands a variety of sprayers, backpack! Spikes of purple loosestrife grows in wet, open, sunny areas threaten plant and animal diversity to. And forms a bush-like clump an area this plant from Europe, has overrun state. Individual plants selectively in landscape situations to prevent killing desirable plants and animal.... Insects overwinter as adults and lay eggs in early fall or spring before the plants to dry out, burn! 5 ), arrived in eastern North America the early 1800s garden plantings or infestations!, boats, etc grow in the early 19 th century grow in the early 19 th century entire cover. Eurasia and Africa recreational activities and gardening through recreational activities and gardening available purple... On tall, narrow spikes from July to mid-September in North Dakota wetlands ( Figure 5 ) ) prevent...

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