What Is Paspalum Grass and How Do You Care for It?

Paspalum is a massive genus of warm-season grasses, with roughly 350 species found across the Americas, but when most homeowners, groundskeepers, and golf course managers say “Paspalum,” they mean seashore paspalum (Paspalum vaginatum), a creeping perennial prized for its ability to thrive in salty soils and coastal conditions where other turf grasses struggle or die outright.¹ It produces a dense, fine-textured lawn with a deep green color, and its care shares some overlap with bermudagrass management but diverges in important ways, especially around salt, mowing height, and shade.

The Paspalum Family at a Glance

The genus Paspalum is one of the largest in the grass family, with species filling ecological niches from tropical savannas to subtropical coastlines throughout North and South America. Many of these species are central to the biodiversity of South American grasslands, and some have been adopted as forage grasses for livestock or as turf for lawns and sports fields.¹ For turf purposes, though, seashore paspalum dominates the conversation. It spreads by both stolons (above-ground runners) and rhizomes (below-ground runners), forming a thick mat that crowds out weeds once established. Cultivars you are most likely to encounter include Sea Isle 1, Sea Isle 2000, Salam, Excalibur, and Platinum TE, each selected for slightly different performance traits like density, color, or salt tolerance.

Why Salt Tolerance Sets It Apart

Seashore paspalum’s defining advantage over bermudagrass and other warm-season turf grasses is its ability to handle saline conditions. This is not a marginal trait. Some cultivars can tolerate irrigation water with salt levels that would kill bermudagrass within weeks. The grass achieves this through several overlapping mechanisms. Under salt stress, seashore paspalum ramps up its production of proline, an amino acid that acts as an internal buffer against osmotic stress. Research has shown a roughly 20-fold increase in proline concentration as salinity rises, making it the primary organic compound the plant uses for osmotic adjustment under high salt.²

Some cultivars go further. Certain seashore paspalum varieties have specialized structures on their leaf surfaces called papillae, tiny bumps on the upper side of the leaf blade. Under salt stress, these papillae sequester sodium, essentially pulling it out of the leaf’s working tissue and storing it in a less harmful location.³ Not every cultivar does this equally well. In controlled studies, the cultivar HI10 showed significantly higher sodium accumulation in its papillae under salt stress compared to its underlying leaf tissue, while other cultivars like Spence showed no significant difference between the two.³ Cultivar choice matters, in other words, and not all seashore paspalums are equally salt-hardy.

Genetic studies comparing the highly salt-tolerant cultivar Supreme with the more moderate cultivar Parish have confirmed that even within the species, there are meaningful physiological differences. Supreme carries higher sodium content in its tissues without ill effect, while maintaining similar potassium levels to its less tolerant counterpart.⁴ If you are planting in a genuinely saline environment, such as coastal property irrigated with reclaimed water, ask specifically which cultivar performs best at the salt levels you expect, rather than assuming any seashore paspalum will do.

Watering and Drought Management

Seashore paspalum has a reputation for needing more water than bermudagrass, and research largely backs this up. In deficit irrigation trials, bermudagrass maintained acceptable turf quality at roughly 66 to 75% of reference evapotranspiration, while seashore paspalum needed 75 to 80% of the same benchmark to stay looking good.⁵ That gap may sound small, but over a full growing season in a hot climate, it adds up to meaningful extra water use. If water conservation is your top priority and salt is not a factor, bermudagrass may be the simpler choice.

That said, seashore paspalum is not fragile in dry spells. Various Paspalum species, including seashore paspalum, have demonstrated survival mechanisms during water deficit, with several accessions showing strong recovery after drought periods end.⁶ The grass will go dormant and brown under severe drought but can bounce back when irrigation resumes. Where it truly shines is in situations where the available water is salty or brackish. Many coastal properties, islands, and golf courses rely on reclaimed or well water with elevated salt content, and that is exactly the scenario where seashore paspalum earns its keep despite its slightly higher water demands.

Getting It Established

Seashore paspalum can be established from seed, sod, sprigs, or plugs, but establishing from seed has some specific quirks worth knowing about. Irrigation method during germination makes a real difference. Research comparing sprinkler and subsurface drip irrigation found that sprinkler-irrigated plots reached about 90% ground cover by the end of the first growing season, while drip-irrigated plots managed only about 58% in the same timeframe.⁷ The surface moisture that sprinklers provide is important for seed germination, and if you only have drip irrigation available, seeding early in the season gives the grass enough time to fill in before winter dormancy.

Dormant seeding, where you put seed down before the growing season begins and let it germinate naturally as temperatures rise, actually showed faster coverage than later seeding dates in the same trials.⁷ For most homeowners, though, sodding or sprigging remains the faster route to a full lawn, especially since seeded varieties are limited compared to bermudagrass. If you do go the seed route, keep the soil consistently moist at the surface for the first few weeks, and plan to be patient through a slower establishment period than you might expect from bermudagrass seed.

Mowing Height Matters More Than You Think

One of the most actionable care tips for seashore paspalum involves mowing height, and it connects directly to the plant’s salt tolerance. Research testing multiple cultivars at different mowing heights found that raising the cut height significantly improved salt performance. At the tallest height studied, root mass of cultivars like Salam, Excalibur, and Adalayd more than doubled as salinity increased, a response that was much less pronounced at lower mowing heights.⁸ In simple terms, if you are irrigating with salty water or dealing with saline soil, raising your mower blade helps the grass cope.

The cultivar Salam stood out particularly at higher mowing heights, showing the strongest photosynthetic rates under high salinity conditions.⁸ For home lawns, a mowing height of about 1.5 to 2 inches is a reasonable starting point. Golf course fairways and tees are maintained much lower, sometimes under an inch, but that requires intensive management, frequent mowing, and ideally fresh or low-salt irrigation. If you are not running a golf course, err on the taller side. The grass will develop a deeper root system and handle stress better.

Performance in Shade

Seashore paspalum handles shade better than most bermudagrass varieties, but “better” is relative. Under heavy shade, both species lose quality. Research measuring responses to 70% and 90% light reduction found that photosynthesis dropped by 10 to 43% at 70% shade and 27 to 67% at 90% shade across the tested entries.⁹ Those are broad ranges because cultivar matters enormously. The cultivar Sea Isle 1 maintained higher turf quality and greener color under low light than the bermudagrass cultivar TifSport. Sea Isle 1’s chlorophyll content dropped by about a third under shade, while TifSport’s dropped by more than half.¹⁰

What this means practically is that seashore paspalum can survive moderate shade, say four to five hours of direct sun per day, better than bermudagrass, but it still wants sun. Dense, year-round shade from buildings or evergreen trees will thin out any warm-season grass, and seashore paspalum is no exception. If you have a partly shaded yard and are choosing between bermudagrass and seashore paspalum, the latter is the better bet for the shadier spots, but do not expect the same density you would get in full sun.

Traffic and Wear Tolerance on Sports Fields

Seashore paspalum has found a growing niche on athletic fields, and research on its wear tolerance helps explain why. The mechanisms behind its ability to handle foot traffic are different from bermudagrass. Rather than relying on rigid, tough leaves, seashore paspalum survives wear partly because of lower total cell wall content in its leaves and greater leaf moisture, traits that make the leaf blade more flexible and less likely to shatter under repeated pressure.¹¹ Higher shoot density and greater potassium concentration in the shoot tissue also contributed to wear resistance in this species.

In simulated football game testing, the cultivars Salam, Sea Dwarf, and Sea Isle 1 all outperformed the benchmark bermudagrass cultivar Tifway after 90 passes with a traffic simulator, roughly equivalent to 45 professional football games. Sea Isle 2000, however, showed the weakest traffic tolerance in the same study.¹² Again, the cultivar you plant matters. If you are managing an athletic field in a coastal or saline environment, seashore paspalum can work well, but picking a traffic-tolerant cultivar is essential.

Cold Is the Hard Limit

The single biggest limitation of seashore paspalum is cold. It is less cold-hardy than bermudagrass, and this is the primary reason it has not displaced bermudagrass across the entire warm-season turf belt. Cold hardiness trials have consistently shown that bermudagrass varieties acclimate to cold faster and survive lower temperatures. In controlled freezing tests, the bermudagrass cultivar Midiron demonstrated superior cold hardiness compared to all tested seashore paspalum ecotypes.¹³ Among the paspalum ecotypes, there was variability; HI-1 performed best when acclimated, while Adalayd ranked better in a non-acclimated state, suggesting the two have different survival strategies.¹³

Freeze events can be devastating. A study comparing a commercial cultivar to a wild ecotype found that freezing reduced meristem density (the growing points the plant uses to recover) by about 98.5% in the commercial cultivar versus 80% in the wild form.¹⁴ Even the wild type lost most of its meristems. In practical terms, this means seashore paspalum is best suited to USDA zones 9 and warmer, roughly the Gulf Coast, Florida, southern California, Hawaii, and similar subtropical and tropical climates. In zone 8 and transitional areas, a hard freeze can kill a seashore paspalum lawn outright. If you live where winter lows regularly dip below the mid-20s Fahrenheit, bermudagrass or zoysiagrass are safer choices.

Diseases to Watch For

Seashore paspalum is susceptible to dollar spot, caused by the fungus Sclerotinia homoeocarpa, which is one of the most common turf diseases worldwide. Testing of eleven seashore paspalum genotypes against two dollar spot isolates found that all genotypes showed damage, though the degree varied significantly depending on both the plant genotype and the virulence of the fungal strain. The more aggressive isolate consistently caused more damage across all tested varieties.¹⁵ Dollar spot appears as small, silver-dollar-sized bleached patches on the lawn, typically during warm, humid weather when dew sits on the leaf blades overnight.

Good cultural practices go a long way toward prevention. Adequate nitrogen fertility, proper irrigation timing (early morning so leaves dry quickly), and avoiding excessive thatch buildup all reduce dollar spot pressure. If you see early signs, raising nitrogen slightly and improving air circulation by pruning nearby vegetation can help the grass outgrow the damage before fungicides become necessary.

Environmental Uses Beyond Lawns

Seashore paspalum is increasingly being studied not just as turf but as a tool for environmental remediation. The plant is recognized for its tolerance to cadmium, a toxic heavy metal that contaminates soils near mines, industrial sites, and areas where contaminated sludge has been applied.¹⁶ Research pairing seashore paspalum with beneficial soil fungi (arbuscular mycorrhizal fungi) and biochar amendments has shown that the combination can increase plant biomass by roughly 9 to 49% on cadmium-contaminated soil compared to unamended controls, boosting the grass’s ability to pull cadmium from the soil.¹⁷

Other Paspalum species play different environmental roles. Paspalum millegrana, a wild species found in northeastern Brazil, produces fine root systems when colonized by mycorrhizal fungi, a trait that makes it useful for stabilizing slopes and controlling erosion in degraded landscapes with poor, low-fertility soils.¹⁸ And in Australian subtropical grasslands, Paspalum lepton (a sward-forming species native to South America) has naturalized and is being evaluated both for its forage value and for its ability to outcompete existing weedy species, though its invasive potential is still being debated.¹⁹ The genus as a whole sits at an interesting intersection of turf science, forage production, and ecological restoration.

Choosing the Right Cultivar

If there is one theme running through all the research on seashore paspalum, it is that cultivar selection drives performance far more than generic species-level expectations would suggest. The cultivar that tolerates salt best is not necessarily the one that handles traffic best or performs best in shade. Sea Isle 1 is a strong all-rounder with good shade tolerance and traffic resistance. Salam stands out for salt tolerance at higher mowing heights and traffic endurance. Platinum TE has become popular on golf course greens for its fine texture and density. Sea Isle 2000, despite its name recognition, underperformed on traffic tolerance in at least one study.

Before committing to seashore paspalum, consider your specific conditions. If your irrigation water is fresh and your winters occasionally dip below freezing, bermudagrass is probably the more forgiving choice. If you are dealing with reclaimed water, coastal salt spray, or brackish well water, seashore paspalum has no real competition among turf grasses. And if you are in a borderline climate zone, look for cultivars with documented cold acclimation ability rather than assuming any variety will handle the occasional freeze. The grass rewards careful matching of cultivar to site, and the research base is deep enough now that you can make that choice with confidence rather than guesswork.

1
Europe PMC. A phylogenetic analysis of the genus Paspalum (Poaceae) based on cpDNA and morphology
2
Environmental and Experimental Botany. Synthesis of organic osmolytes and salt tolerance mechanisms in Paspalum vaginatum
3
Plant Physiology. The Halophyte Seashore Paspalum Uses Adaxial Leaf Papillae for Sodium Sequestration
4
PubMed Central. Comparative transcriptome profiling provides insights into plant salt tolerance in seashore paspalum (Paspalum vaginatum)
5
Agronomy Journal. Deficit Irrigation of Seashore Paspalum and Bermudagrass
6
Grass and Forage Science. Morphological and physiological responses and the recovery ability of Paspalum accessions to water deficit and waterlogging
7
Agronomy Journal. Bermudagrass and Seashore Paspalum Establishment from Seed Using Differing Irrigation Methods and Water Qualities
8
Crop Science. Effects of Salinity on Seashore Paspalum Cultivars at Different Mowing Heights
9
Crop Science. Assessment of Low Light Tolerance of Seashore Paspalum and Bermudagrass
10
Scientia Horticulturae. Physiological acclimation of seashore paspalum and bermudagrass to low light
11
Crop Science. Mechanisms of Wear Tolerance in Seashore Paspalum and Bermudagrass
12
HortTechnology. Preliminary Observations on the Traffic Tolerance of Four Seashore Paspalum Cultivars Compared to Hybrid Bermudagrass
13
Crop Science. Low Temperature Tolerance Assessment in Paspalum
14
Acta Botanica Brasilica. Freeze tolerance differs between two ecotypes of Paspalum vaginatum (Poaceae)
15
International Turfgrass Society Research Journal. Response of Seashore Paspalum Genotypes to Two Isolates of Sclerotinia homoeocarpa
16
Ecotoxicology and Environmental Safety. Posphoproteomics profiling reveals the regulatory role of a phosphorylated protein PvFBA1 in cadmium tolerance in seashore paspalum
17
PubMed Central. Microorganisms and Biochar Improve the Remediation Efficiency of Paspalum vaginatum and Pennisetum alopecuroides on Cadmium-Contaminated Soil
18
Rev. Caatinga. Exotic Arbuscular Mycorrhizal Fungi and Native Dark Septate Endophytes on the Initial Growth of Paspalum millegrana Grass
19
Tropical Grasslands-Forrajes Tropicales. Paspalum lepton – a valuable adjunct to the suite of grasses used in grazing systems in the subtropics or a potential weed