© John Scheper, Floridata.com
Albizia julibrissin var. rosea (Carr.) Mouillef, Hardy silk-tree albizia
Albizia julibrissin var. mollis Benth, Abyssinia silk-tree albizia 
These infrataxa are rarely distinguished in the literature and are not referred to in this review.SYNONYMS:
Mimosa on a disturbed site near the Tallapoosa River, Alabama.
Photo © James H. Miller, USDA Forest Service.
Mimosa is native to Asia [26,30,40,54,56,83,123,128,131], occurring from Iran to Japan [9,20,41,74,104]. It is often asserted that mimosa was introduced to the United States as an ornamental in 1745 [8,9,25,83,111,123]. However, according to Cothran , it was brought to North America about 1785 and was first offered for sale in 1807. By the 1950s mimosa was established locally in Georgia . In 1972 it was a new record in Oconee County, South Carolina . By 1992 mimosa was considered common in disturbed areas of the Chauga River Gorge in Oconee County . It was first reported in the flora of Illinois from 1956 to 1978 . Mimosa was described as "newly documented" in the Washington, DC area in 1995 , and, according to Connelly , was first reported in the flora of Connecticut in 2008. A 1994 guide to plants of Butte County, California, lists mimosa as occurring in north-central Sacramento Valley and southern portions of the Cascade Range . The distribution and impacts of mimosa are best documented in the southeastern United States. Based on Southern Forest Inventory and Analysis data collected from 2001 to 2008, mimosa is most common in north-central Alabama .HABITAT TYPES AND PLANT COMMUNITIES:
Mimosa appears to be most common in disturbed communities. It is noted in oak-hickory (Quercus-Carya spp.), pine (Pinus), mixed pine-hardwood, riparian forests, and grasslands.
Mimosa occurs in oak-hickory, pine, and mixed pine-hardwood communities in the Southeast. Mimosa was considered a potentially high threat to oak-hickory woodlands but its threat status in pine habitats was unknown . In Tennessee, it occurred infrequently in oak-hickory upland woods  and was present in mature, second-growth oak-hickory forest . It occurred at low density in the sapling layer of an old-growth, longleaf pine (P. palustris) forest in Alabama where fire had been excluded for at least 45 years [67,121]. In Great Smoky Mountains National Park in Tennessee, mimosa was often associated with Virginia pine (P. virginiana). Several other tree and shrub species commonly associated with mimosa in the park are listed by Baron and others . A few mimosa seedlings occurred in a loblolly pine (P. taeda) plantation in Georgia . It occurred infrequently in a Florida forest dominated by sand post oak (Q. margarettiae), turkey oak (Q. laevis), and longleaf pine or slash pine (P. elliottii)  and was a minor component in mixed pine-hardwood forests near Macon, Georgia . The understory of a recently thinned, 30-year-old loblolly pine stand in the Piedmont region of South Carolina consisted of honey-locust (Gleditsia triacanthos), black cherry (Prunus serotina), and mimosa . It was one of 19 overstory species, although it occurred at low density and near the edge, in a forest dominated by sweetgum (Liquidambar styraciflua), loblolly pine, and red maple (Acer rubrum) near Virginia's Atlantic coast .
In north-central California, mimosa was listed as occupying foothill woodland communities ; given the location, the vegetation was likely dominated by oaks.
Mimosa often occurs in riparian areas and floodplain communities. It has been reported in these habitats in Maryland , Washington, DC , Tennessee [6,8], and North Carolina. In North Carolina mimosa was reported in riparian areas with sycamore (Platanus occidentalis), sweetgum, yellow-poplar [91,122], red maple, and several oak and hickory species . In a wetland created in Tuscaloosa, Alabama, it occurred with loblolly pine, willow (Salix sp.), and saplings of red maple and sweetgum . Mimosa was found around springs and in sinkholes in upland woodlands of Florida  and occurred in riparian woodlands of north-central California . In a constructed wetland in New Jersey, it occurred in an area dominated by marsh species such as marsh seedbox (Ludwigia palustris), purple loosestrife (Lythrum salicaria), yellowseed false pimpernel (Lindernia dubia), and common rush (Juncus effusus) . Mimosa has been reported in riverbank communities in subtropical forests in the foothills of Garhwal Himalayas, India, part of mimosa's native range .
The extent to which mimosa can establish in grasslands is unclear. A review notes its occurrence in grasslands . In Kentucky, mimosa occurred in the ecotone between an oak-hickory forest and a cool-season grassland that established following logging , but Stocker and Hupp  note that it is not invasive in grasslands.
Mimosa is frequent in disturbed communities such as those found along roadsides and in old fields. For information on disturbed sites where it occurs, see Successional Status. See the table below for species that occur with mimosa in study areas that have experienced light to severe disturbance.
|Species that are repeatedly reported with mimosa on disturbed sites|
Photo by Dan Tenaglia, missouriplants.com
Mimosa leaves and fruit.
Chuck Bargeron, University of Georgia, Bugwood.org
Botanical description: This description provides characteristics that may be relevant to fire ecology and is not meant for identification. Keys for identification are available (e.g., [39,40,123,128]).
Aboveground description: Mimosa is a deciduous , nitrogen-fixing [83,89,111,126] tree or shrub [61,126] with thin [9,83], nearly smooth [9,74,83] bark. It has a broad crown [30,39,40,54,74,123] and single or multiple [9,83], short trunks [40,126]. It ranges from 10 to 50 feet (3-15 m) tall [9,20,30,39,83,123,128]. The champion mimosa, last measured in 2006, was 64 feet (20 m) tall and had an 80.4-foot (24.5 m) spread. Its circumference at 3 feet (1 m) above ground was 103.2 inches (262 cm) . Average circumference of mimosa in the subtropical forests in the foothills of Garhwal Himalayas was 76.9 inches (195.2 cm) . Mimosa has alternate leaves, 4 to 20 inches (15-38 cm) long [9,39,40,74,83,123,126] and up to 6 inches (15 cm) wide [40,126]. The leaves are bipinnately compound [9,20,30,40,83,123,128] and move in reaction to light [26,30] and touch . The oblong leaflets [39,74,123,126] are 5 to 15 mm long [40,74,83,126,128] and 2 to 5 mm wide [30,126]. The showy flowerheads [9,126] occur in clusters [26,83] at the ends of branches [9,39,83,126]. Each head has 15 to 25 sessile flowers [9,83] from 1 to 2 inches (2.5-6 cm) long [9,30,74,83]. Mimosa's fruits are flattened legumes [26,74,83,123,126,128] from 3 to 8 inches (8-20 cm) long [20,26,39,83,123,128] and 0.6 to 1.2 inches (1.5-3 cm) wide [39,40,54,123,126,128]. They contain 5 to 16 seeds [41,83] that are about 6 to 12 mm long, half as wide [9,40,123], and have hard seed coats .
Life span, population dynamics, and stand structure: Mimosa is apparently short lived in the United States [9,26,40,96], due to a soil-borne fungus (Fusarium) that infects the root system and causes wilting and eventually death (DeWolf 1968 as cited in ). Researchers studying mimosa populations in and around Athens, Georgia, suggest that in the southeastern United States, mimosa is characterized by frequent colonization and extinction of local populations, and that mimosa often senesces within 10 to 20 years. However, they indicate that thinning and extinction of mimosa populations only occurs on very shady sites or after the canopy closes . Baron and others  report an average life span of around 30 years. The minimum age of mimosa reported in Korea ranges from 30 to 45 years or more .
Mimosa may form dense, even-aged stands in some areas. Sites that are greater than about 650 feet (200 m) from mature mimosa trees appear to be colonized by 1 or a few individuals. Once these individuals flower and produce seed, the site becomes populated by even-aged recruits. Sites with many mature trees nearby are generally just colonized by dense, even-aged stands . A field survey in Great Smokey Mountains National Park in the summer of 1975 found mimosa on 87 sites, 16 of which included mature trees or clumps of mature trees. Two of these sites had a large number of saplings. The remaining 71 sites included only seedlings, with as many as 1,000 seedlings in the same vicinity .Raunkiaer  life form:
Fruits first appear in June  and mature from August [9,54] to November [96,98,129]. According to Parrotta and others , seeds disperse from September to November. A description of mimosa notes that the legumes split open in winter . Fruits may remain on the tree into winter [9,20,83] or spring .
In a greenhouse experiment mimosa stopped growing when daylight hours were short and grew vigorously with daylight of 14 hours or longer .REGENERATION PROCESSES:
Pollination and breeding system: Mimosa is monoecious or andromonoecious and pollinated by insects . Flowers are visited by bees, butterflies [41,61], and hummingbirds [41,54,61]. It is not clear whether mimosa flowers are perfect [41,123] or if the apical flower of each head is perfect and the rest are staminate . Pardini and Hamrick  cite Elias (1980) as describing mimosa flowers as andromonoecious, but disagree based on observations of individual inflorescences commonly producing 3 to 9 fruits.
Mimosa is self-incompatible [41,53]. Inbreeding occurs occasionally . For information on pollen donor variability, see Irwin and others  and Pardini and Hamrick . Pardini and Hamrick  provide information on spatial genetic structure of mimosa populations.
Seed production: Observations by Pardini and Hamrick  suggest that mimosa begins producing seed at an early age. Several authors note that mimosa produces many seeds [8,9,25,83,96,104,126], and one source reports that it produces 8,000 seeds/year (Wick and Walters 1974 cited in ).
Seed dispersal: Mimosa seeds are primarily dispersed by gravity  and secondarily by wind, water, and animals. Several sources suggest that the thin, papery legumes are wind dispersed [41,90,96,105]. Observations in Georgia suggest that wind can carry mimosa seeds at least 300 feet (~90 m) . Seeds may travel long distances in high winds . An experiment to determine the wind-dispersal capability of several species found that mimosa legumes could disperse from the parent tree in a 6 mile (10 km) per hour horizontal breeze . Reviews suggest that mimosa seeds are also transported by water [9,83] and animals . Mimosa seeds may also be dispersed in contaminated fill dirt .
Seed banking: Several authors note that mimosa seeds have a hard, impermeable seed coat [31,129] that requires scarification to break dormancy (see Germination, below), suggesting that they may remain viable in the soil for long periods. However, seed bank studies were lacking as of 2010. Several reviews cite studies that found a small percentage of mimosa seeds kept in dry storage remained viable for 70  to nearly 150 years [22,93,115]. A study by Wick and Walters (1974 cited by [9,98,129]) found 90% viability of mimosa seeds stored in loosely corked bottles for 5 years. A flora from the southeastern United States reports that mimosa seeds remain viable for "several years" in soil . Mimosa seed was not detected in soil samples taken from a forested site where it occurred in the overstory at low density near the edge .
Germination: Mimosa seeds are dormant due to their hard seed coat and must be scarified to germinate . Exposure to heat [42,99] and fungi , soaking in water [89,98] or acid , or other damage to the seed coat can break mimosa seed dormancy. For more information on the effects of heat on germination rates, see Fire adaptations and plant response to fire. The presence of fungi in soil resulted in a 30.1% germination rate in mimosa seeds that had not been previously scarified, significantly (P<0.05) greater than the 11.4% germination rate of unscarified seeds planted in sterilized soil . Soaking in water resulted in 79.6% of mimosa seeds germinating over a 4-year period . Manual snipping of part of the seed coat resulted in 93% germination after 7 days in one laboratory study  and 90% germination after an unspecified time in another . Mechanical scarification resulted in germination rates from 89.7% to 98.4% . Other methods for stimulating mimosa germination include hot water  and sulfuric acid [10,98,129]. Mimosa seed germination following 8 months at 54 °F (12 °C) was only 2.5% , suggesting that cool temperatures do not promote mimosa germination. According to a flora of Texas, generally one-quarter to one-third of mimosa seeds germinate .
According to the Woody Plant Seed Manual, planting seeds no more than 1 inch (2 cm) deep in loose moist soil in full sunlight favors mimosa germination .
Seedling establishment and plant growth: Under appropriate conditions mimosa seedlings may have high survival rates. Mimosa survival on acid surface-mine spoils in Kentucky averaged 84% . No mortality was observed in mimosas planted on a landfill in South Korea . In a trial to determine mimosa's potential as domestic goat forage, 96.5% of mimosa seedlings planted in experimental plots in March survived their first year . However, in a test to determine mimosa's usefulness as livestock forage in the Louisiana coastal plain, very few seedlings established during a period with below-average precipitation . Due to the rarity of mimosa saplings (>4 inches (10 cm) tall) in a 1975 field survey of Great Smoky Mountains National Park, the authors suggested that few mimosa seedlings survive their first year, except in open areas and along roads, mostly likely due to mowing and shading from forest trees .
Increased cover of mimosa following prescribed fire in western Tennessee was likely due to mimosa seedlings establishing from the soil seed bank . See Plant response to fire for details of this study.
Circumstantial evidence suggests that mimosa seedling establishment is aided by disturbance (e.g., [8,77,102]). For example, mimosa occurred on loosened skid trails and was among the dominant species in compacted skid trails 7 months after selective harvesting in an oak-hickory forest at Oak Ridge, Tennessee. Mimosa did not occur in similar undisturbed microsites in this study . See Successional Status for more information on the association of mimosa with disturbed areas.
Mimosa grows quickly under favorable site conditions [9,26,98,111,126]. One-year-old, wilt-resistant clones were 2 to 4 feet (0.6-1.2 m) tall when planted in a North Carolina pasture. During the first growing season, they grew 14 mm/day and increased in height by 91%; in 6 years, they grew to 20 feet (6 m) tall and 6 inches (15 cm) in diameter . On a landfill in South Korea, mimosa reached an average height of 8.2 feet (2.49 m) after 3.6 years . Mimosa in acid surface-mine spoils in Kentucky grew to an average height of 4.9 feet (1.5 m) over 4 years . Mimosa grew well with long photoperiods in a greenhouse . Experimental exposure to sassafras (Sassafras albidum) leachates reduced mimosa root growth .
Vegetative regeneration: Several reviews note mimosa's ability to reproduce vegetatively [104,111] by sprouting from roots [8,9,27]. A review notes that mimosa colonies form from root sprouts .
Mimosa sprouting after cutting or damage is commonly reported [9,25,111,126]. Mimosa trees killed by Fusarium wilt disease may create a mass of root sprouts. In some areas of Georgia and Tennessee, roadside mimosas survive only as root sprouts, as the main portion of the tree has been killed by the wilt disease . Sprouts may grow over 3 feet (1 m) in a single season [9,25]. However, observations at Great Smoky Mountain National Park led managers to suggest that mimosa seedlings (2.5 to 4 inches (6-10 cm) tall) do not sprout after mowing . For more detail on mimosa response to cutting or other treatments, see Control.SITE CHARACTERISTICS:
Moisture: Since it occurs on wet to dry sites , mimosa does not appear sensitive to moisture conditions . It occurred in a constructed wetland in New Jersey that was dominated by several marsh species  and occurs near rivers that are frequently flooded [6,102]. In mimosa's native range it occurs in moist scrub and woodland areas . Moist soil may favor mimosa seedling establishment . Mimosa has been reported in mesic sites . Establishment of mimosa was rare on the Louisiana coastal plain during a period with 75% of the long-term average precipitation . However, Vines  and Weber  note that mimosa is resistant to drought, and mimosa has been observed in xeric areas [6,8].
Soil: Although descriptions in the literature are limited, reviews state that mimosa occurs in a wide range of soil conditions [9,111]. Weber  states that mimosa is adapted to "poor soil", and Moore  notes that mimosa's nitrogen-fixing capability enables it to grow well on infertile soil.
Mimosa occurs on sites with acidic to moderately alkaline soil pH and grows on acid surface-mine spoils. At a landfill in south Korea, mimosa grew on sites with pH ranging from 5.67 to 7.94 . Mimosa grew on surface-mine spoils in Kentucky where pH ranged from 4.0 to 7.1. Soluble salt concentrations on these sites ranged from 0.205 to 0.243 mmhos/cm, and phosphorus concentrations ranged from 1.6 to 8.1 ppm. Mimosa's growth and survival were generally better on sites with high phosphorus concentrations. In areas with low phosphorus concentrations, greater growth occurred on sites with neutral pH .
Soil textures reported from sites with mimosa are generally coarse. In the South Carolina Piedmont, mimosa occurred in loamy sand , and at a landfill in South Korea, mimosa occurred in sandy loam . Mimosa has been reported in coarse soil at a constructed marsh in New Jersey  and in mixtures of sand, gravel, and boulders next to a river in northern Tennessee .
Topography: Mimosa has been reported in flat areas [8,32] and on steep slopes . It was reported "on a level area" in the South Carolina Piedmont  and on slopes ranging from <10° to 90° in Great Smoky Mountains National Park .
Mimosa is considered a pioneer species in its native Japan . In North America, mimosa is generally considered an early- to midsuccessional species, given its reported affinity for disturbed, open areas (e.g., [8,40,41,51,52,81]) such as old fields (e.g., [50,95,112]), old homesites (e.g., [8,18,132]), roadsides (e.g., [8,9,18,56,81,130]), and woodland edges (e.g., [33,40,82,111,126]). It was a "pioneer invader" that dominated stripmine overburden soils in experimental plots in Florida by the second growing season . Mimosa may establish or persist in later stages of succession on some sites [67,102].
Mimosa may establish or increase on recently burned, thinned, or logged forest sites, and commonly occurs in forest edge habitat. Mimosa had low canopy cover (<1%) in a mature, second-growth oak-hickory forest in western Tennessee, but its cover increased after fire  (see Plant response to fire). It occurred in the understory of a recently thinned, 30-year-old loblolly pine stand in South Carolina . Mimosa seedlings established in skid trails after selective harvesting in an oak-hickory forest in Tennessee . A few mimosa individuals occurred near the edge of a midsuccessional forest bordering an old agricultural field near Virginia's Atlantic coast. The authors speculate that they established following clear-cutting for agriculture . In Kentucky, mimosa occurred (but was rare) in an oak-hickory forest edge bordering a cool-season grassland . Despite its common occurrence along forest edges, an analysis of edges in North Carolina forest did not list mimosa among the species that were considered good edge indicators .
Mimosa may occur in late-successional forests under some circumstances. Mimosa occurred at low density in the sapling layer of an old-growth, longleaf pine forest in Alabama where fire had been excluded for at least 45 years [67,121]. No additional information was given regarding characteristics of microsites where mimosa occurred in this forest; however, its establishment was likely due to anthropogenic influences, given the location within the city of Flomaton, Alabama. Mimosa had <1% cover in the understory of a completely forested, undisturbed reference site on an island in the Potomac River  (see Shade tolerance, below for more details).
Shade tolerance: Mimosa tolerates partial shade [9,83,124] but is generally considered intolerant of shade [8,80,89]. Full sunlight may promote flowering , germination, and seedling establishment . Mimosa often occurs in open areas [30,72,104,111,114] and rarely occurs under a full canopy . In Japan, it was an indicator species of habitats with the highest percent of photosynthetically active photon flux density at ground level . A study in western North Carolina showed mimosa was more likely present in watersheds with less forest cover . None of the mimosa trees near a yellow-poplar successional forest in Great Smoky Mountains National Park were growing under a closed canopy . Mimosa occurred on a completely forested island in the Potomoc River where sunlight intensity of averaged 16% of full sunlight at 3 feet (1 m) above ground . It is unclear where mimosa occurred on this site, or what growth stage it was in, but it may have occurred in small nautral canopy gaps or edges that resulted from flooding.
Immediate fire effect on plant: As of 2010, no information on the direct impacts of fire on mimosa was available. Given its ability to sprout from the roots following injury or top-kill (see Vegetative regeneration and Control), mimosa is likely only top-killed by fire.
Mimosa seed in the soil is likely to survive fire, and heat from fire may scarify mimosa seeds and increase germination rates. In the laboratory, exposing mimosa seeds to open flame for 1 to 3 seconds  and dry, 176 °F (80 °C) heat for 5 to 60 minutes  increased germination rates (see Postfire germination).
Postfire regeneration strategy :
Tree with sprouting root suckers
Ground residual colonizer (on site, initial community)
Initial off-site colonizer (off site, initial community)
Secondary colonizer (on- or off-site seed sources)
Fire adaptations: As of 2010, no information was available that specifically addressed fire adaptations in mimosa. Given its ability to sprout from the roots following injury or top-kill and the rapid growth of sprouts (see Vegetative regeneration and Control), once established on a site, mimosa is likely to persist and may spread even under a regime of frequent fire. Mimosa commonly occurs on open, disturbed sites (see Successional Status). Sites with these postfire attributes may be favorable for seedling establishment. Mimosa produces seed with a hard, impermeable seed coat that requires scarification for germination (see Seed banking), so seedlings may establish from the soil seed bank after fire. Seedlings may also establish from off-site seed sources, as mimosa seed has the potential to disperse long distances.
Plant response to fire: The very limited information available on mimosa's response to fire suggests that it persists and may increase in abundance after fire. Only 3 fire studies in the available literature (as of 2010) include information on mimosa, and only 1 of these provides information on mimosa abundance before and after fire. In 1993, mimosa occurred in the Flomaton Natural Area, a remnant stand of presettlement longleaf pine forest where fire had been excluded for over 40 years. Restoration efforts at Flomaton included prescribed fires in winter or spring of 1995 and 1996, midstory hardwood removal in early spring of 1996, and a 3rd prescribed fire in late spring of 1997. A survey was conducted in October 1997, and mimosa was still present [68,121]. No information was provided regarding mimosa size, abundance, or microsite location within the stand, and no additional information will be forthcoming from this site. In January 2008 the Flomaton Natural Area was clear-cut after Champion sold the land to a private landowner who cut down the trees, pulled out the stumps, and put in a trailer park. In the Piedmont National Wildlife Refuge near Macon, Georgia, mimosa was a minor species on both unburned mixed pine-hardwood sites and on sites that were burned in winter every 4 or 5 years for 20 years, when surveyed 4 years after the last fire. The frequency of mimosa on unburned transects was less than 2%, and frequency on burned transects was less than 1% . No additional information was provided.
In a mature, second-growth, oak-hickory forest in Tennessee where fire had been excluded for at least 30 years, mimosa cover increased following spring thin-and-burn and burn-only treatments and did not increase on control plots. The prescribed fire consumed all surface fuel on about 2.5 acres (1 ha) in 2 hours and had a maximum flame length of 1.6 feet (0.5 m). The table below shows increases in mimosa on plots that were burned or thinned then burned, while cover on control plots remained low .
|Mimosa cover before and after restoration treatments in oak-hickory forest in Tennessee |
|Time of sampling||Before treatment||After treatment||Before treatment||After treatment|
The author speculated that increases in mimosa cover were due to fire-stimulated germination from the soil seed bank . Postfire germination could be due to seed scarification by fire, changes in seedbed characteristics, or both.
Postfire germination: Laboratory studies suggest that fire may result in increased mimosa germination by scarifying the seed. In the laboratory, brief exposure to open flame  and dry heat (176 °F (80 °C))  stimulated mimosa germination. The table below shows increased germination in mimosa seeds exposed to open flame for 1 to 3 seconds :
Germination rate of mimosa seeds exposed to open flame for varying periods 
|Length of fire exposure (seconds)||Percent germination|
|*Percents followed by different letters are significantly different (P<0.05).|
Hand-scarified mimosa seeds germinated faster than heat-scarified mimosa seeds, but after 240 days mimosa seeds exposed to heat of 176 °F (80 °C) for 5 to 60 minutes had similar germination rates as hand-scarified seeds. Mimosa seeds exposed to 176 °F for 4 hours had higher germination rates than those exposed to 176 °F for 1 minute .
|Germination rate of mimosa seeds after hand scarification or exposure to 80 °C dry heat for varying lengths of time |
|after 7 days||after 21 days||after 240 days|
|*Percents followed by different letters within columns are significantly different (P<0.05).|
Fire regimes: No information was available (as of 2010) on fire regimes in plant communities where mimosa is native. In its nonnative North American range, information regarding plant communities in which mimosa is invasive is also lacking. Mimosa is most often described as occurring in areas of anthropogenic disturbance and along edges of native, second-growth forests that were either logged or cleared for agriculture at some earlier time (see Habitat Types and Plant Communities), and where presettlemet fire regimes are no longer functioning. Many of the vegetation types in which mimosa occurs (oak-hickory, pine, mixed pine-hardwood) have presettlement fire regimes characterized by relatively frequent, low-severity fires. Mimosa also occurs in riparian forests, where presettlement fire regimes were thought to be characterized by infrequent fires (see the Fire Regime Table). Find further fire regime information for the plant communities in which this species may occur by entering the species name in the FEIS home page under "Find Fire Regimes".
Given its regeneration strategies and successional status (see Fire adaptations), mimosa seems well adapted to establish after fire and to persist under a regime of frequent fire. Mimosa occurs in communities that are managed with frequent fire [49,121,125], but it also occurs in areas where fire has been excluded for several decades [91,110,121].
FIRE MANAGEMENT CONSIDERATIONS:
Available evidence suggests that a single fire will not control mimosa and may promote its establishment.
Potential for postfire establishment and spread: Mimosa is likely to persist by sprouting and, if a seed source is available, establish from seed after fire. Although data regarding mimosa's response to fire are lacking, mimosa is known to sprout following injury or top-kill (see Vegetative regeneration and Control), and evidence suggests that seed germination may be stimulated by heat scarification (see Plant response to fire). Additionally, mimosa seems to grow best on disturbed sites with open canopies (see Successional Status). These traits suggest that burned sites should be monitored for postfire establishment and spread of mimosa if it occurs onsite or nearby.
Preventing postfire establishment and spread: Preventing invasive plants from establishing in weed-free burned areas is the most effective and least costly management method. This may be accomplished through early detection and eradication, careful monitoring and follow-up, and limiting dispersal of invasive plant seed into burned areas. Specific recommendations include:
For more detailed information on these topics see the following publications: [5,16,43,118].Use of prescribed fire as a control agent: No information was available (as of 2010) on the use of prescribed fire to control mimosa. Given its persistence after fires (see Plant response to fire and Fire regimes), fire alone is not likely to control mimosa.
IMPORTANCE TO WILDLIFE AND LIVESTOCK:
Mimosa may be a minor food source for some wildlife and has some potential as livestock feed.
Palatability and/or nutritional value: Mimosa seed may provide some food for birds and squirrels [54,123], while butterflies and hummingbirds likely consume mimosa nectar [54,61]. Mimosa leaves may provide browse for deer and other wildlife [1,54,98]. According to Kartesz , mimosa has been reported as toxic.
Mimosa's nutritional value and growth rate give it potential as a summer browse species for livestock in the southeastern United States [17,99]. In a test of mimosa as a forage species in the Louisiana coastal plain, mimosa had consistently high leaf crude protein level . In an analysis of mimosa as forage in Arkansas, nitrogen levels met the nutritional requirements of cattle and domestic goats, and the presence of secondary metabolites were below detectable levels . In a study of mimosa's potential as domestic goat feed, digestibility and chemical composition were similar to alfalfa (Medicago sativa) . In a domestic sheep feeding trial, mimosa digestibility was 61%, and there were no signs of toxicity . In an experiment on mimosa as domestic goat forage, herbage mass production was adequate . Other experiments suggest that mimosa tolerates 2 complete defoliations during the grazing season  and that yield was maximized when 6 to 8 weeks of regrowth occurred between harvests [13,14]. Despite mimosa's tolerance, requirements for managing defoliation are likely greater than required of currently used forage species . Although domestic goats  and domestic sheep [3,13] eat mimosa, it has been shown to have relatively low palatability compared to some available foods [1,3]. Mimosa's other limitations include its potential to become invasive  (see Impacts) and a lack of evidence, as of 2010, that it significantly improves animal performance measures such as weight gain .
Cover value: Wick and Walters (1974 cited in ) state that mimosa provides valuable cover for wildlife.OTHER USES:
Rehabilitation planting: Mimosa has been recommended as a soil builder  and is used in rehabilitation planting on landfills [63,105] and mine sites [11,100].
Other: Mimosa may be used for timber [61,123] and as an alleycrop species and mulch in legume production [60,79]. Although mentioned as a timber plant by Kartesz  and apparently used in cabinetmaking in Asia , mimosa's weak and brittle wood was noted in a review . There have been some successes with experimental trials that used mimosa as an alleycrop species to maintain or improve soil fertility while growing commercial crops. Mimosa fixed an estimated 245 pounds of nitrogen/acre over one growing season in an experimental planting in Alabama . However, its use on broad scales is not recommended [60,79]. Kartesz  notes that mimosa is edible and useful in erosion control. Use as a biofuel  has also been reported.IMPACTS AND CONTROL:
Despite a lack of data on the impacts of mimosa on native habitats, mimosa is commonly considered a weed of concern in the south-central and southeastern United States. Miller  states that mimosa is 1 of the 16 most prevalent nonnative species in subtropical forests of the southeastern United States. Managers in Alabama, Arkansas, and Kentucky consider mimosa a problem weed . In Texas mimosa is widespread and "can aggressively invade native habitats" . According to a 2008 review , mimosa is listed as invasive in 8 southern and mid-Atlantic states. Mimosa was 1 of 12 species commonly reported as a problem by federal, state, and nongovernmental land managers of the southern Appalachians . In the mid-1970s, the small size, scattered spatial arrangement, and occurrence of mimosa populations only on disturbed sites in Great Smoky Mountains National Park led to the conclusion that mimosa had very little impact on native flora of that area, despite occurrence in riparian plant communities . From 1994 to 2005, mimosa was one of the 9 most common weeds in the Great Smoky Mountains National Park . However, the impact of mimosa establishment in this area had not been determined as of 2008. Mimosa is classified as a weed that easily spreads into native communities and displaces native species in several southeastern states including Tennessee , Georgia , and Florida . It frequently occurs in the central peninsula and northern regions of Florida . In 2005, mimosa was classified as a "significant threat" instead of a "severe threat" in Kentucky due to fewer impacts on native plant communities and fewer invasive characteristics than weeds that pose more severe threats . As of 2003, mimosa was considered "moderately invasive" in Virginia due to slow spread and negligible impact on ecosystem processes . It had low management priority in another Virginia study area due to comparative ease of control .
Riparian habitats may be at greater risk of mimosa invasion than other communities, likely due to regularly disturbed soils in riparian areas as well as the potential for mimosa seeds to disperse in water . Mimosa is reportedly a "serious problem" along some streams in Tennessee , where it has been documented in cobble bars of the New River  and streambanks in Great Smoky Mountains National Park . A review of southeastern weeds notes that mimosa invades riparian habitats, spreads along stream networks, and can reduce native species and hardwood regeneration in riparian habitats . Mimosa was described as a "common pest" of the floodplain in Rock Creek Park in Washington DC . It was reported on an island in the Potomac River, Maryland, that had experienced little human disturbance but had greater light penetration than mainland forests, likely due to higher velocities of previous floods on the island compared to the mainland . Mimosa has also been reported in riverbank communities in subtropical forests within its native range .
Control: Prevention has been recommended to minimize further spread of mimosa, while control of established populations is generally accomplished with some combination of mechanical and chemical treatments.
Fire: The ability of prescribed fire to control mimosa is likely limited and is discussed in Fire Management Considerations.
Prevention: Reducing seed sources and disturbances have been suggested to help prevent the spread of mimosa. The Southern Region of the US Forest Service prohibits planting mimosa on National Forest lands . Using natives instead of mimosa for ornamental planting has been recommend [28,111], and Swearingen and others  provide a list of alternate native species for planting. For an example of selecting and implementing a weed risk assessment, see Jefferson and others . In Great Smoky Mountains National Park, reducing anthropogenic disturbance was suggested to limit mimosa establishment .
Cultural: No information is available on this topic.
Physical and/or mechanical: Effective mechanical treatments typically involve repeated girdling or cutting of mimosa close to the ground before seed production. Repeated cutting or cutting in combination with herbicide application is necessary to control sprouting [9,111,126]. For example, in experimental plots in North Carolina mimosa coppiced in February grew to an average height of 54 inches (137.7 cm) by the end of June. A cutting height of 10 inches (25 cm) significantly (P=0.013) decreased herbage mass production compared to a cutting height of 20 inches (50 cm) . Results of another experiment suggest that mimosas cut to 4 inches (10 cm) 2 or 3 times per growing season had shorter life spans than those cut at 20 inches (50 cm) or higher. Despite the difference, mimosas cut to 4 inches survived an average of 641 days . Swearingen and others  recommend cutting mimosa at ground level. Several reviews [9,111,126] recommend cutting before seed production to prevent seed dispersal.
Seedlings up to 4 inches (10 cm) have been controlled by regular mowing , and seedlings up to 10 inches (25 cm) can be pulled by hand . Effective hand-pulling of mimosa requires removal of the entire root [9,126].
Biological: Research into appropriate biological control agents was lacking as of 2008. A root fungus , a bruchid beetle (Bruchidae) [24,89], and a psyllid  apparently impact mimosa to some extent, but there were no data on their potential as biological control agents.
Mimosa is susceptible to a Fusarium root fungus, which causes vascular wilting and typically results in rapid mortality [9,30,40,96,123]. Mimosa strains that are resistant to the fungus are available [74,116]. The use of this root fungus to control mimosa could be limited, depending on the extent to which these strains have established in native plant communities.
Bruchid beetles infested 21% of mimosa seeds in a germination study , and DeLoach  suggests bruchid beetles may be a useful biological control for mimosa.
The introduced psyllid Acizzia jamatonica is apparently an obligate feeder of Albizia and was documented in Clarke County, Georgia, in 2006 .
Chemical: Herbicides are often used to control mimosa sprouting following mechanical treatments , or as a basal bark application on larger trees. Trees larger than 3 inches (1.2 cm) in diameter may require retreatment . Recommended herbicides and applications for mimosa saplings and large trees are described in several reviews [9,25,71,83,126]. See the Weed control methods handbook for considerations on the use of herbicides in natural areas and detailed information on specific chemicals.Integrated management: Information on integrated management of woody eastern weeds is reviewed by Webster and others . Miller  recommends integrated control for several southeastern weeds, including mimosa. It is apparently common to combine mechanical and chemical treatments to control existing mimosa trees and prevent sprouting [9,111,126]. Used in conjunction with preventative measures, this would reduce the risk of mimosa spreading into new sites [8,111,117].
|Fire regime information on vegetation communities in which mimosa is likely to occur. This information is taken from the LANDFIRE Rapid Assessment Vegetation Models , which were developed by local experts using available literature, local data, and/or expert opinion. This table summarizes fire regime characteristics for each plant community listed. The PDF file linked from each plant community name describes the model and synthesizes the knowledge available on vegetation composition, structure, and dynamics in that community. Cells are blank where information is not available in the Rapid Assessment Vegetation Model.|
(Potential Natural Vegetation Group)
|Fire severity*||Fire regime characteristics|
|Percent of fires||Mean interval
|California oak woodlands||Replacement||8%||120|
|Surface or low||91%||10|
(Potential Natural Vegetation Group)
|Fire severity*||Fire regime characteristics|
|Percent of fires||Mean interval
|Southern Appalachians Forested|
|Bottomland hardwood forest||Replacement||25%||435||200||>1,000|
|Surface or low||51%||210||50||250|
|Mixed mesophytic hardwood||Replacement||11%||665|
|Surface or low||79%||90|
|Surface or low||89%||6||3||10|
|Surface or low||78%||10||1||10|
|Appalachian Virginia pine||Replacement||20%||110||25||125|
|Surface or low||64%||35||10||40|
|Appalachian oak forest (dry-mesic)||Replacement||6%||220|
|Surface or low||79%||17|
(Potential Natural Vegetation Group)
|Fire severity*||Fire regime characteristics|
|Percent of fires||Mean interval
|Surface or low||97%||4||1||5|
|Surface or low||97%||3||1||5|
|Longleaf pine-Sandhills prairie||Replacement||3%||130||25||500|
|Surface or low||97%||4||1||10|
|Coastal Plain pine-oak-hickory||Replacement||4%||200|
|Surface or low||89%||8|
|Surface or low||97%||2||1||8|
|Loess bluff and plain forest||Replacement||7%||476|
|Surface or low||85%||39|
|Surface or low||93%||63|
Replacement: Any fire that causes greater than 75% top removal of a vegetation-fuel type, resulting in general replacement of existing vegetation; may or may not cause a lethal effect on the plants.
Mixed: Any fire burning more than 5% of an area that does not qualify as a replacement, surface, or low-severity fire; includes mosaic and other fires that are intermediate in effects.
Surface or low: Any fire that causes less than 25% upper layer replacement and/or removal in a vegetation-fuel class but burns 5% or more of the area [40,58].
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