Paspalum notatum

From Bugwoodwiki

Authors: Helen Violi, Global Invasive Species Team, The Nature Conservancy

P. notatum
Scientific Name
Paspalum notatum
Scientific Name Synonyms
Paspalum uruguayense
Paspalum taphrophyllum
Paspalum saltense
Common Names
bahiagrass, Bahia grass


Paspalum notatum is a sod-forming, deep-rooted, warm-season perennial grass.[1] The individual short rhizomes of P. notatum are tough, stout, and are often covered with the overlapping bases of old leaf sheaths. The live leaf bases at the terminus of each rhizome usually have a purplish hue. The culms (stems) of P. notatum are ascending, usually ranging from 20 to 75 cm tall, and the dark green leaves are 4 to 10 mm wide and linear-elongate in shape. The leaf blades are typically 6 to 25 cm long and the leaf sheaths are generally 4 to 20 cm long and slightly inflated. The membranous ligule is less than 1.5 mm long.[2][3]

The inflorescences have two to several spicate branches 4-12 cm long, and each branch (or raceme) has two rows of spikelets. These spikelets are either paired or positioned with one slightly below the other. The spikelets are broadly ovate or broadly obovate (rarely elliptic), 3 to 4 mm long, and 1.0 to 2.5 mm wide.[4][2] The margins of the upper glume and lower floret lemma are smooth and can be distinguished from Paspalum distichum by having an entirely smooth upper glume.

Several cultivars of P. notatum, such as the hardy ‘Pensacola’ or ‘Paraguay’ strains, were introduced into North America for forage and erosion control. ‘Pensacola’ is the most common cultivar in Florida.[5] P. notatum cultivars can be distinguished from most other sod-forming pasture grasses by their characteristic short scaly rhizomes, their distinctive inflorescences, and by their dark green leaves.[6]


P. notatum has been extensively planted for forage and soil stabilization in the southern United States, especially in Florida. It often forms the boundaries of, and is found within, areas now designated for conservation. Despite its decreasing productivity with age, P. notatum continues to dominate pastures decades after abandonment. Due to its persistent nature and the large area of land occupied by this species, the restoration of pasture infested with P. notatum has become a major land management challenge.

P. notatum dominates over two million hectares in the southeastern U.S.[7] and impedes restoration in many southeastern plant communities. For example, native long-leaf pine forests (Pinus palustris) are generally able to re-establish in abandoned pastures following cultivation or grazing[8], but the presence of P. notatum in these pastures inhibits the regeneration of these forests. P. notatum can also inhibit the regeneration of slash pine (Pinus elliottii).[9] P. notatum forms a tough, extensive sod that does not allow native species to survive. The removal of this sod layer is probably the most effective way of eliminating P. notatum, but it is difficult to do so. Even when the sod layer is removed, P. notatum has been known to reestablish itself via its seed bank and remaining rhizomes.

Repeated herbicide treatments can also work to control P. notatum, but the best control approach is to combine mechanical removal in combination with herbicide treatments. Several herbicides such as imazaquin, imazameth (formerly AC 263,222), imazethapyr, and sulfometuron-methyl, can all suppress P. notatum growth and seedhead production.[10][11][12][13] These herbicides are often been used in turfgrass situations or along roadsides, but does not result in a reduction of P. notatum numbers or range. In other turfgrasses where P. notatum is a problem, dalapon, glyphosate, sulfometuron, or atrazine, have been applied successfully to control P. notatum while leaving Cynodon dactylon (bermudagrass) or Eremochloa ophiuroides (centipedegrass) relatively intact. Reddy & Singh (1992)[14] also found that the use of organosilicone adjuvants can increase the efficacy of glyphosate applications against P. notatum. Herbicide applications, however, can be expensive. Therefore, mechanical treatments such as repeated disking or sod removal are favored for its control when these are appropriate options.[15]

The best control of P. notatum occurs with a combination of sod removal and herbicide applications. Sod removal should occur in the spring before seedhead production for the best results.[16] Helen Violi (pers. comm.) reports that using a rotary plow (20 cm deep), however, is not completely effective. The rhizomes and seeds of P. notatum are capable of producing new plants following sod kill or removal. Following sod removal, Helen Violi recommends using an application of glyphosate (at 21.9 L a.i./ha) using a hand sprayer in the spring for effective control (pers. comm.).

The use of prescribed fire is not effective in controlling P. notatum, as it is fire-adapted and resprouts from underground rhizomes following a burn. P. notatum changes the behavior of fire in ecosystems with otherwise patchy vegetation cover because it forms a continuous sod fuel layer. By altering fire behavior, it changes ecosystem function.

In areas that can be manipulated by different hydrological regimes, flooding can be an effective tool in the control of P. notatum. David (1999)[17] found that a single inundation period of 5 months of at least 40 cm in depth controlled P. notatum, and that repeated inundations resulted in a complete elimination of P. notatum by the second year. Additionally, the native Pontederia cordata (pickerelweed) and Panicum hemitomon (maidencane) became established soon-after P. notatum removal.

The reintroduction of native vegetation into P. notatum-dominated pastures often requires re-seeding or the planting of native propagules. In general, wetter sites require less restoration efforts.[15] Other more challenging exotic invasive species can also invade restoration sites. Native ruderal species such as dog fennel (Eupatorium capillifolium) can impede the restoration of pre-pasture plant communities (E. Wertschnig, pers. comm. 1999).

P. notatum was listed as a Category I Exotic Pest Species in Florida, but was recently removed from this list due to questions regarding its ability to invade intact ecosystems.[18] It has been observed to rapidly spread vegetatively into disturbed soil on plow lines and roads adjacent to planted areas. Sharon Hermann (personal communication) has observed P. notatum invade approximately 10 meters over 3 years into a plowed utility right-of-way. Gordon et al. (1999)[15] evaluated the ability of P. notatum to invade established native vegetation in Florida, and determined that while it might have expanded from the area in which it was originally sown, its invasion beyond areas of disturbed vegetation was not biologically significant.


P. notatum is native to South Brazil, Uruguay, the Chaco region of North Argentina, and northwestern Paraguay.[19][20] It may also be native to the West Indies.[1] P. notatum has been introduced as a turf and forage grass into Australia, Japan, Mexico, and the United States. It is found in most Central and South American countries.[21] It is widely cultivated in low-altitude pastures of south-western Japan and is a popular forage grass on the north coast of New South Wales and on the south coast of Queensland.[22]

P. notatum was introduced to the USA from Brazil in 1913 by the Bureau of Plant Industry at the Florida Agricultural Experiment Station, Gainesville.[23] Different cultivars for forage and erosion control were soon introduced, such as ‘Paraguay’ in 1947 to Georgia, and ‘Argentine’ in 1945 into Florida by the USDA.[24] ‘Wilmington’ and ‘Pensacola’ varieties were soon discovered in the southern U.S. in the 1940s, and today, several varieties of P. notatum are thought to cover over two million hectares in the south-eastern U.S..[7]

In North America, P. notatum can be found from southern California to eastern Texas, from southern Florida to New Jersey, and from central Tennessee to Arkansas.[1][25] Reported occurrences of P. notatum include: Alabama, Arkansas, California, Florida, Georgia, Louisiana, Missouri, New Jersey, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, Puerto Rico and the Virgin Islands.[26]


P. notatum can invade pastures and disturbed rights-of-way, and impede the growth and survival of native species by the formation of dense mats of vegetation. P. notatum can dominate the habitat, and its stands can resist invasion by other plant species. It has not, however, been documented to invade intact native systems.[15] P. notatum persists under even intense grazing regimes.[27] Rhizomes from well-fertilized P. notatum pastures can contain enough resources to persist for 2-3 years.[28] In the southeastern U.S., some cultivars are no longer a desirable forage grass, and P. notatum may be considered a weed.[29]

P. notatum has altered the natural fire regime in many areas within the southeastern U.S. Since the 1940s, cattle ranchers have used winter burns to stimulate the growth of forage species, including P. notatum.[30] Native understory vegetation, such as wiregrass (Aristida beyrichiana), responds best to late summer and fall burns.[31]

In addition to changes to fire regimes, the installation of P. notatum pastures has also resulted in changes to hydrological regimes. Ditches and canals constructed to establish and maintain these pasture grasses alter historic drainage patterns and water levels. These changes can negatively affect neighboring wetlands. Therefore, in large-scale restoration plans, additional time and money must be spent to identify the nature of the hydrological changes and possible ways to reduce or eliminate further habitat deterioration due to existing drainage systems.

P. notatum’s impact on native soil communities are largely unknown, but it has been widely used as a host for commercially valuable mycorrhizal fungi or as a companion plant.[32][33][34][35] The mycorrhizae in P. notatum pastures have been documented to be negatively affected by the addition of some nutrients, primarily phosphorus.[36][37] Although it is difficult to determine the possible effects of pasture conversion and P. notatum presence on the native soil community, there is speculation that a shift in the composition and spore numbers of vesicular-arbuscular mycorrhizae (VAM) may influence the growth and survival of native plants.[38]


P. notatum is best adapted to moist, sandy soils in sub-tropical and temperate climate zones (Anon. 1987).[24] It is adapted to both upland and lowland areas, and has been found on open ground, savannas, and pastures from elevations at sea level to 2000 m in Central and South America.[25] P. notatum easily invades disturbed pastures, roadsides, and rights-of-way, but does not appear to invade intact, undisturbed, native systems.


Light, moisture and temperature

P. notatum easily invades open, disturbed habitats. It is well-adapted to low-nutrient soils. It is relatively flood tolerant [39][40] and drought tolerant.[19] It does well in climates that receive 750 to 1200 mm of precipitation per year. In its native range, P. notatum is often found on sandy soils in areas where there are periods of heavy precipitation followed by up to six months of extreme drought.[19] In sub-tropical and temperate climate zones it grows best in sandy soils with a pH of 5.5 to 6.5 in.[24] P. notatum is moderately frost tolerant, but the degree of tolerance varies among cultivars.


P. notatum infestations enlarge by seed dispersal or by spreading clonally via rhizomes. Rates of clonal growth have been documented at approximately 0.24 to 0.49 m per year. Under favorable conditions, the ‘Pensacola’ cultivar can spread vegetatively at a rate of 0.30 to 0.45 m per year.[5] In the southeastern United States, growth rates are highest between March and October.[28] Individual plants are able to produce a bunch-culm basal diameter of 500 mm in one growing season.[5]


P. notatum is a long-day plant that is strongly influenced by photoperiod [41] and temperature.[42] Flowering is induced when daylight exceeds 13.5 hours per day.[41] Floral inflorescences emerge in early May to early July. Flowering in a given population usually occurs over a 4-week period.[42] In Florida, seeds of P. notatum mature from June through the summer.[1]


Varieties and cultivars of P. notatum generally have different ploidy levels, which influence how they each reproduce. The tetraploid varieties are generally considered obligate apomicts, and reproduce by unfertilized but viable seeds. The diploid forms reproduce sexually [43], and are usually highly cross-pollinated.[5] The sexually reproducing varieties are wind-pollinated. Seeds of P. notatum are typically dispersed by ruminants. P. notatum can also spread vegetatively.

Seed germination

The germination of P. notatum seeds is slow and intermittent. There are differences in germination rates between cultivars.[21][44] These differences in germination rates can ensure stand establishment over time.[45][46] P. notatum seeds can germinate between 21.0 and 37.5° C, and optimal temperatures for seed germination and seedling growth are between 32 and 37.5° C.[47]

Germination rates of P. notatum can be increased by passing the seeds through the intestinal tract of a ruminant animal[48][49], mechanical or acid scarification [21][50][47], and by the presence of mulch.[51] Soil characteristics (such as the proportion of sand in the soil matrix) can also influence rates of P. notatum seed germination.[52]

Predation and diseases

P. notatum is relatively free of damaging insects and diseases.[28] It hosts fewer species and lower overall abundances of insects than does bermuda grass (Cynadon dactylon).[53] The two most damaging insects to P. notatum are mole crickets (Scapteriscus spp.) and army worms (Spodoptera frugiperda). Mole crickets were introduced from South America[54] and are considered the most destructive insect pest to pasture grasses in Florida.[55][56] Mole crickets damage P. notatum by feeding and tunneling within the plant.[54]

Fungi and other pathogens which occur on P. notatum include: Rhizoctonia solani, fairy rings (Chlorophyllum sp. and Marasmius sp.), root rots (Pythium spp.), and slime molds (Physarum spp. and Fuligo spp.). These infections generally do not cause great damage to P. notatum in the southeastern U.S..[57] The seedheads of certain cultivars (for example, ‘Argentine’) of P. notatum have also been documented to be sometimes significantly damaged by ergot (Fusarium spp. and Claviceps paspali), but this is not prevalent in most other cultivars in the U.S..[28]


P. notatum is widely planted and used in the United States for forage and erosion control.


Potential for restoration of invaded sites

In most situations, P. notatum does not appear to be a highly invasive plant. It can dominate pastures and areas where it has been intentionally planted, and then spread into disturbed fields and roadsides; however, it does not seem to invade intact communities. There is no evidence that it recruits into ruderal sites exclusively by seed.[18] Nor does P. notatum appear to spread from pastures into adjacent forested areas. The dense mats of vegetation created by P. notatum, however, present major obstacles to the successful restoration of pastures to native sandhill or forest communities. Successful restoration of P. notatum-dominated sites typically involves the mechanical removal of P. notatum sod, repeated plowing/disking, and herbicide applications. If this can be done, the potential for native restoration is probably medium to high.

Control measures

Various techniques including disking, sod removal, burning, and/or herbicides, have been tested to control the spread and extent of P. notatum for restoration projects in Florida. Most of these restoration projects have been conducted on sites that were originally scrubby, mesic and hydric flatwoods, sandhill, or wetland communities.

The most effective method for controlling P. notatum is a combination of mechanical removal and herbicide applications.[16] All studies showed that plowing/disking or sod removal (to a depth of 20 cm) was the most effective method for reducing the aboveground cover of P. notatum.[8][40] In former flatwoods communities, however, a single disking and a combination of disking and prescribed burning was ineffective at controlling P. notatum [16][58], and actually promoted the growth of other problematic exotic species. Further, P. notatum is able to re-invade sites via pieces of rhizomes and from the soil seed bank (Bisset pers. comm.; Wertschnig pers. comm.).[16][15] Repeated disking, therefore, or complete sod removal may be necessary to control P. notatum.

Single herbicide treatments using glyphosate (e.g. RoundUp®) were also ineffective at controlling P. notatum. Repeated treatments of herbicide or a combination of mechanical and herbicide treatments (glyphosate at 21.9 L a.i./ha) were the most successful (H. Violi, pers. comm.).[59]

In places where the hydroperiod can be controlled, flooding is also a viable control method for P. notatum. A minimum of 5 months at least 39.5 cm deep is necessary for good control.[17] Repeated inundation in following years will eventually eliminate P. notatum, and can promote the establishment of native wetland species.


Restoration efforts conducted by Nancy Bissest (The Natives, Inc.), Beth Wertshnig (CF Industries), and The Nature Conservancy [15] demonstrate that the direct seeding of native propagules collected from nearby plant communities can successfully establish native species to improved pastures following multiple herbicide and disking treatments.[60] At the Reedy Creek Mitigation Site in Florida, seed bed preparation involved repeated herbicide applications of glyphosate on P. notatum, followed by a month of repeated disking. The site was then smoothed-down using a water-filled roller followed by another herbicide application. Native seeds were then introduced to the site during the winter, using a broadcast seeding method. A more detailed description of the site preparation and native plant seeding/planting techniques used in these and other pasture restoration projects in Florida has been compiled by Walker (1999)[61].

Despite the repeated disking and herbicide treatments used in site preparation, P. notatum seedlings were still observed on the more xeric portions of the site. The pre-emergent herbicide imazapic (tradename Plateau®) is currently being tested for its effectiveness in reducing the germination of P. notatum and other undesirable species. Preliminary results show that imazapic effectively reduces the germination of P. notatum and other exotics, but also reduces the rates of germination of desirable native species.[62]

When restoring P. notatum infestations to cutthroat grass (Panicum abscissum) communities in Florida, transplanted plugs of native species may be necessary because cutthroat grass infrequently flowers.[16][63] Other native plants such as beaksedge (Rhynchospora spp.) and witchgrass (Dicanthelium spp.) may be valuable in protecting these and other transplanted herbs. For example, Uridel (1994)[8] found that the native gayfeather (Liatris spp.), wiregrass (Aristida spp.), and other transplanted herbs showed increased rates of survival, despite high densities of other exotic plants such as senna (Cassia spp.) and flatsedge (Cyperus spp.) in plowed and herbicide-treated plots. These native species are hypothesized to aid in the survival of transplanted herbs by providing shade and reducing soil moisture loss during drought conditions. It was also observed that the presence of already established herbs reduced rates of herbivory on newly transplanted gayfeather plants.[8]

Other restoration attempts experimented with introducing native plants into pastures without first controlling P. notatum . Results indicate that native plant survival two years post-planting was high, but P. notatum seems to be uninhibited by the presence of the native species.[64]

Overall, sod removal or repeated disking/plowing, and repeat herbicide treatments, were the most effective techniques for controlling P. notatum, and typically result in increases in native plant species diversity. In general, the mechanical and herbicide combinations resulted in high colonization by undesirable species (invasive ruderal and exotic species found problematic in restorations). Additionally, these combination treatments generally did not prove to be significantly more effective in controlling P. notatum than mechanical treatments alone.


Following control treatments and restoration plantings, monitoring is necessary to determine results. Viability of P. notatum seeds in the seed bank may influence how long monitoring at a particular site needs to be continued.

Variations of the point-intercept method are often used to obtain pre-treatment and post-treatment plant species cover estimates. On large-scale projects, or when time and funds are limited, visual estimates of vegetation cover within small plots (at least 0.25 m in diameter) are appropriate if enough plots are sampled.

The monitoring method should be selected based on the goals of the restoration project. For example, if information is sought regarding the treatment response of individual native species, a more detailed sampling design may be needed. Trained botanists are required to determine which grassland species are native and which are potentially problematic non-native species. Monitoring data must be analyzed to determine whether the management objectives are being met and if modifications to the control treatment are needed.


The following research topics need attention:

  1. Long-term monitoring of restoration sites in Florida to determine competitiveness of native plant species with re-invading P. notatum.
  2. Continue and expand on studies examining the invasiveness of P. notatum into natural systems.
  3. Determine which P. notatum cultivars pose the greatest problem to restoration projects, and which, if any, may have the potential to invade and spread into intact native plant communities.
  4. Conduct further research to identify which native species are good competitors and how best to introduce those species into restoration sites.
  5. Continue projects to find native alternatives to P. notatum for highway shoulders and other non-agricultural areas



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  60. Bisset, N.J., P.N. Gray and S.A. Hedges. 1998. Direct seeding of wiregrass and associated species in reclaimed land. Unpublished manuscript.
  61. Walker, G. B. 1999. Developments in the restoration of upland pasture lands in Florida. MS (Unpublished). University of Central Florida, Orlando, FL.
  62. Bisset, N.J. 1999. From Bahia Pasture to Flatwoods at the Reedy Creek Mitigation Bank: Site Preparation, Direct Seeding, Weed Control, and Planting. Conference Literature: Annual Meeting of the Coastal Plain Chapter of the Society of Ecological Restoration.
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Additional References

  • Anonymous. 1987. Paspalum notatum Flugge. Tropical Grasslands 21(2):93-94.
  • Weaver, D.N. 1988. Bahiagrass control in bermudagrass pastures. Proc. South. Wee. Sci. Soc. 41: 114.

Original Document

Element Stewardship Abstract; Helen Violi, 2000.