Native to the southern U.S., black locust has been planted extensively for its attractive and fragrant flowers, hard wood, and rapid growth. Forms multiple-stemmed clones and is slow to grow leaves in the spring. Its historic native range was small compared to its current distribution and was constrained to the Appalachian Mountains and Ozark Plateau (Stone 2009, Kartesz 2014). It is native to the Appalachian Mountains and Ozark Plateau, with its native range reaching from central Pennsylvania to Alabama and Georgia. Black locusts have invasive traits that enable them to spread aggressively. Robinia pseudoacacia L. Black locust. Leaves are pinnately compound with seven to 21 small, round leaflets per leaf. Juvenile black locust has similar foliage to the shrubby bristly locust (R. hispida), which is also native to the U.S. but not to the Great Lakes region. black locust. Invasive Species: Robinia pseudoacacia, Black Locust. PlayCleanGo: Stop Invasive Species in Your Tracks. Fact Sheets and Identification Links Report new occurrences by submitting a report through EDDMapS Midwest, emailing Arrest The Pest, calling Arrest the Pest (1-888-545-6684), or contacting your local county agricultural inspector, © 2020 Minnesota DNR | Equal opportunity employer |, Call 651-296-6157 or 888-MINNDNR (646-6367), Black locust identification training module, Identification and management of black locust, Identification and management of Minnesota Noxious Weeds. 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. Black locust is a fast growing thorny tree in the pea family that can reach 40 to 100 feet. Leslie J. Mehrhoff, University of Connecticut. Ken Chamberlain, The Ohio State University. A deciduous tree that, while native to parts of the United States, has spread to and become invasive in other parts of the country. Fragrant, drooping white flowers have a yellow blotch on the uppermost petal. Black locust is probably a native of somewhere in the Appalachians. Midwest Invasive Species Information Network (MISIN) Educational Module and Assessment. Black locust (Robinia pseudoacacia), also called false acacia or yellow locust, is one of the most difficult invasive trees to eradicate. A deciduous tree that, while native to parts of the United States, has spread to and become invasive in other parts of the country. It is native to the Appalachian Mountains and Ozark Plateau, with its native range reaching from central Pennsylvania to Alabama and Georgia. Since these are rare habitats, invasions in these areas are of top concern for conservation of biodiversity. It is a very fast-growing tree … Fruit pods are smooth, 2 to 4 inches long, and contain 4 to 8 seeds. Foliar spray of glyphosate or clopyralid can also be effective on single-species stands, where there are not desirable plants nearby that could be damaged. Often forms dense stands where established and can choke out other vegetation. Oecologia 172:915-924) Black locust is probably a native of somewhere in the Appalachians. They are now considered an invasive species in some areas even within the natural range. Common names: black locust. This tall, fast-growing, and thorny member of the legume family can quickly form dense stands in prairies and along forest edges, displacing native vegetation and reducing the herbaceous understory. For one thing, given that there are more than 400 invasive species in NY State alone, the bristles would wear out long before you could finish the job. Foliage Black locust leaves are generally blue-green, small and oval, with short sharp thorns. false acacia. yellow locust. Invades forests, upland prairies and savannas, pastures, old fields, and roadsides. Black locust is actually native to the southeastern U.S., but is considered an invasive outside of that range. Trees grow upright in forests, but develop an open growth form in more open areas. Leaflets are 1.5 in. Glyphosate, or Roundup, can also be sprayed on black locust foliage while the trees are still growing. Fragrant, drooping white flowers arranged in eight-inch clusters hang from branch tips. Black locust is known to invade pitch pine woodlands and barren communities, all of which rare in Maine and some are rare globally. However, the young branches of prickly locust are covered in bristly hairs and its flowers are purple. Black locust is a nitrogen-fixing tree that prefers disturbed habitat, old fields, thickets and degraded woods. The tree is also considered an invasive species in parts of Australia and South Africa. Trees grow from 40 to 100 ft. (12 to 30 m) in height. Trees grow from 40 to 100 ft. (12 to 30 m) in height. The black locust robinia tree can tolerate poor soil, drought, pollution, and even salt. Once introduced to an area, black locust spreads easily into areas where its shade eliminates competition from other (sun-loving) plants. Data Source and References for Robinia pseudoacacia (black locust) from the USDA PLANTS database : Name Search: name search type enter a search name State Search ... California Invasive Plant Council. Young black locust invading a former hayfield, my glove for scale. Its vigorous vegetative reproduction forms extensive, dense groves of clones that exclude native vegetation. What A deciduous tree, black locust (Robinia pseudoacacia) was brought here from the Appalachian and Ozark Mountains for erosion control and durable wood. (It is present in the Northeastern Highlands ecoregion). Black locust has been formally listed as an invasive species in Wisconsin and Connecticut, and the state of Massachusetts prohibits it. Location, habitat, weather, and a variety of other conditions are factors that help determine the best treatment choice. It occurs naturally on the lower slopes of the Appalachian Mountains, where it is known as a weedy tree. The health and vigor of the trees are important defenses against devastation, as research has shown that good growing conditions are more important than genetic resistance. It spreads aggressively into these environments, especially in the absence of disturbance (another topic for another posting…). A pair of long, stipular spines is found at the base of most leaves. (4 cm) long. Cooperative Extension Offices – Find your local Cooperative Extension office on this map provided by USDA. Black locust is native to the southern Appalachians, the Ozarks, and other portions of the Midsouth but is considered an invasive species in the prairie and savanna regions of the Midwest, where it can dominate and shade those open habitats. Jan Samanek, State Phytosanitary Administration, Bugwood.org. Black locust. Robinia pseudoacacia (black locust) is a deciduous tree (family Fabaceae) that grows to 100 feet tall. It has white flowers and compound leaves, and the saplings and smaller branches of mature trees have thorns. 2015-41595-24254 from the USDA National Institute of Food and Agriculture. Trees grow from 40-100 feet in height. Appearance Robinia pseudoacacia is a deciduous tree that, while native to parts of the United States, has spread to and become invasive in other parts of the country. Black locust (Robinia pseudoacacia) is considered invasive in Connecticut, Maine and Massachusetts, and yet it is native in Pennsylvania and could be considered native to the New England Ecoregions. Paul Wray, Iowa State University, Bugwood.org. ECOLOGICAL THREAT Its vigorous vegetative reproduction forms extensive, dense groves of clones that exclude native vegetation. When tall-growing vegetation like honey locust or black locust make contact with utility power lines, service interruptions regularly occur. There is one un-paired leaflet at the tip of each leaf and a pair of short, sharp thorns at the base of each leaf where it attaches to the twig. This species can change nutrient cycling due to its ability to fix nitrogen in the soil and can potentially create favorable habitat for other non-native species. I understand that black locust lacks explicitly documented historical record from within the state, which forms the primary basis to argue that it be considered non-native. It is curious that black locust, which by some accounts was spread from its native range 500 or more years ago, has only been dubbed invasive in the past decade or so. The short answer is "Yes, Black Locust is invasive." Invades forests, upland prairies and savannas, pastures, old fields and roadsides. (Von Holle, B. et al. Black locust leaves, stems, bark and seeds are toxic to horses. Since these are rare habitats, invasions in these areas are of top concern for conservation of biodiversity. Black locust is a nitrogen-fixing tree that prefers disturbed habitat, old fields, thickets and degraded woods. Oil-based triclopyr ester products can also be sprayed along the base of an un-cut stem, coating all sides of the lower 12-18 inches of the main stem.These are systemic herbicides that are taken up by plants and move within the plant, which can kill leaves, stems, and roots. As a legume, this tree can thrive and grow rapidly in nitrogen-deficient soils. Black locust was introduced into Britain in 1636 where it has slowly garnered a universal appeal to tree lovers. Trees grow from 40 to 100 ft. (12 to 30 m) in height. Black locust was introduced into Britain in 1636 where it has slowly garnered a universal appeal to tree lovers. Black locust is part of the pea family and its flowers look similar to other pea-family flowers. Black locust is … Black locust (Robinia pseudoacacia L.), also known as false acacia, post locust and yellow, white or green locust, is a tree belonging to the pea (Fabaceae) family. Seedlings and sprouts are easily identified by the long paired thorns (also present on the branches of mature trees). Black locust stems can be cut at the base with brush-cutters, chainsaws or hand tools, followed by treating the stump with a 20-percent solution of Roundup. California Invasive Plant Council, Berkeley, California. Overview Appearance Robinia pseudoacacia is a deciduous tree that, while native to parts of the United States, has spread to and become invasive in other parts of the country. One way that invasive plant seeds and fragments can spread is in soil. yellow locust. Black locust is susceptible to some damage from two native insects, the locust borer (Megacyllene robiniae) and the locust leafminer (Odontota dorsalis). This species is a Minnesota Department of Agriculture Restricted Noxious Weed meaning it is illegal to import, sell, or transport. Robinia hispida, bristly locust, Bugwood.org, Robinia neomexicana, New Mexico locust, Bugwood.org, Robinia pseudoacacia Identification Card – US Fish & Wildlife Service, Robinia pseudoacacia Fact Sheet – US Fish & Wildlife Service. (20.3 cm) long clusters. Taxonomy: Scientific and Common Names for This Species, Native Species That Can Resemble Black Locust, Additional Information, Biology, Control and Management Resources, Terrestrial (land-dwelling) invasive species, Aquatic (Water-Dwelling) Invasive Species, Public Outreach and Education Materials (Invasive species), How to report an invasive species sighting to EDDMapS, United States Land-Grant University System, Weeds Gone Wild: Alien Plant Invaders of Natural Areas. Black locust is a deciduous tree that, while native to parts of the United States, has spread to and become invasive in other parts of the country. You can prevent the spread of invasive plants. Robinia pseudoacacia. I recently received an email from a private landowner: I had a question for you about Black Locust and the Indiana’s Most Unwanted website.I saw Black Locust is listed on there even though this site says it’s native range includes Indiana. C.M. The original range of the locust is in the Appalachian, Ozark and Ouachita range located in the middle mountains of Eastern North America. Damage to roots or stems (such as from fire, wind, cutting, or disease) stimulates vigorous sprouting, root suckering and lateral spread. Black locust (Robinia pseudoacacia) General description: Fast-growing tree in the Legume family, growing 30-90’ tall with a trunk 2-4’ in diameter. They mature in September and persist on the trees through the winter. It is curious that black locust, which by some accounts was spread from its native range 500 or more years ago, has only been dubbed invasive in … Mechanical control can be done by mowing and burning, but mechanical control is only temporarily effective because of black locusts' ability to resprout and spread vegetatively. The showy, fragrant, white to yellow flowers give way to a smooth, thin seed pod that is 2 to 4 in. INVASIVE: Black Locust Robinia pseudoacacia. Invasive Species: Robinia pseudoacacia, Black Locust Black locust is a deciduous tree that, while native to parts of the United States, has spread to and become invasive in other parts of the country. I see invasives.org mentions that it can become invasive in prairie and savanna areas. Black locust is a fast growing tree that can reach up to 75 feet in height. Black Locust: A Woodland Invasive. Black locust is a deciduous tree that, while native to parts of the United States, has spread to and become invasive in other parts of the country. Review of risks should be undertaken before selecting these trees for planting sites. The tree has spread to and become invasive in … Flower bloom in late May and June. Black locust, a nitrogen-fixing member of the legume family, is a large deciduous tree with thorn-covered branches that grows up to 25 m (80 ft) tall. Plant Conservation Alliance, Alien Plant Working Group DNR RESPONSE TO COVID-19: For details on adjustments to DNR services, visit this webpage. It is currently spreading into states like Minnesota that are outside of its historical range. Trees grow upright in forests, but develop an open growth form in more open areas. Black locust leaves are made up to 7-21 paired leaflets on both sides of a common stalk (pinnately compound). It has been extensively planted for its nitrogen-fixing qualities in land reclamation, erosion control, and its hard wood. Ecosystem legacy of the introduced N 2-fixing tree Robinia pseudoacacia in a coastal forest. The original range of the locust is in the Appalachian, Ozark and Ouachita range located in the middle mountains of Eastern North America. The bark of black locust is light brown, rough, and becomes very furrowed with age. Black locust has an extensive fibrous root system that can be shallow or deep, depending on the soil. Trees grow from 40-100 ft. (12-30 m) in height. Flowering occurs in the spring, when flowers develop in 8 in. Sometimes plants are planted purposefully. Websites … Each leaf is six to 14 inches long and arranged alternate to each other along the twigs. The tree is also considered an invasive species in parts of Australia and South Africa. Belonging to the Fabaceae or pea family, it is endemic to the southeastern United States, particularly parts of the Appalachians and Ozarks. Leaves are pinnately compound with seven to 21 small, round leaflets per leaf. Historically planted as a landscape tree, black locust has escaped cultivation and become invasive in California and elsewhere.

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