North America Non-native Plant

Paspalum

Botanical name: Paspalum hieronymi

USDA symbol: PAHI13

Habit: grass

Native status: Not native but doesn't reproduce and persist in the wild

Paspalum: The Mysterious Grass That’s Hard to Pin Down If you’ve stumbled across Paspalum hieronymi in your plant research, you’re likely scratching your head right about now. This particular member of the paspalum family is something of an enigma in the gardening world – and that’s putting it mildly! What ...

Paspalum: The Mysterious Grass That’s Hard to Pin Down

If you’ve stumbled across Paspalum hieronymi in your plant research, you’re likely scratching your head right about now. This particular member of the paspalum family is something of an enigma in the gardening world – and that’s putting it mildly!

What We Know (And What We Don’t)

Paspalum hieronymi belongs to the grass family (Poaceae), making it a true grass rather than just something that looks grass-like. Beyond that basic classification, reliable information about this species becomes surprisingly scarce. Unlike its more famous cousins in the Paspalum genus, this particular species hasn’t made much of a splash in gardening circles or botanical literature.

The Challenge with Unclear Origins

Here’s where things get tricky for us native plant enthusiasts: we don’t have clear information about where Paspalum hieronymi naturally occurs or whether it’s truly native to North America. This lack of geographic distribution data makes it impossible to recommend for native plant gardens with confidence.

Why This Matters for Your Garden

When a plant’s origins and characteristics are unclear, it’s generally wise to proceed with caution. Here’s why:

  • Unknown invasive potential – without knowing its natural range and growth habits, we can’t assess whether it might become problematic
  • Unclear ecological benefits – we don’t know what wildlife it supports or how it fits into local ecosystems
  • Missing growing requirements – successful cultivation becomes a guessing game
  • Uncertain hardiness – you won’t know if it can survive in your climate zone

Better Alternatives for Your Native Garden

Instead of taking a chance on this mysterious grass, consider these well-documented native Paspalum species that offer known benefits:

  • Bahiagrass alternatives: Look for native warm-season grasses suited to your region
  • Regional native grasses: Consult your local native plant society for grass recommendations
  • Established paspalum species: Other Paspalum species with known native ranges and growing requirements

The Bottom Line

While Paspalum hieronymi might sound intriguing, the lack of reliable information makes it a poor choice for most gardeners, especially those focused on native plants. The beauty of native gardening lies in choosing plants that we know will thrive in our conditions while supporting local ecosystems – and that requires solid information about a plant’s origins, needs, and behaviors.

When in doubt, stick with well-documented native species. Your garden (and local wildlife) will thank you for making informed choices rather than taking mysterious plant gambles!

How

Paspalum

Grows

Growing season

Spring, Summer, Fall

Lifespan

Moderate

Growth form & shape

Stoloniferous and Prostrate

Growth rate

Rapid

Height at 20 years
Maximum height

0.8

Foliage color

Green

Summer foliage density

Porous

Winter foliage density

Porous

Foliage retention

No

Flowering

No

Flower color
Fruit/seeds

No

Fruit/seed color
Allelopath

No

Nitrogen fixing

None

Toxic

None

C:N Ratio

Medium

Fire Resistant

Yes

Foliage Texture

Medium

Low-growing Grass

Yes

Resproutability

No

Coppice Ability

No

Bloat

None

Paspalum

Growing Conditions

Adapted to Coarse Soil

Yes

Adapted to Medium Soil

Yes

Adapted to Fine Soil

Yes

Anaerobic tolerance

None

CaCO₃ tolerance

Medium

Cold Stratification

No

Drought tolerance

Low

Nutrient requirement

Medium

Fire tolerance

High

Frost-free days minimum

269

Hedge tolerance

None

Moisture requirement

High

pH range

5.5 to 8.0

Plants per acre

4800 to 40000

Precipitation range (in)

40 to 70

Min root depth (in)

1

Salt tolerance

Low

Shade tolerance

Intolerant

Min temperature (F)

15

Cultivating

Paspalum

Flowering season
Commercial availability

Routinely Available

Fruit/seed abundance
Fruit/seed season
Fruit/seed persistence

No

Propagated by bare root

No

Propagated by bulb

No

Propagated by container

No

Propagated by corm

No

Propagated by cuttings

No

Propagated by seed

No

Propagated by sod

No

Propagated by sprigs

Yes

Propagated by tubers

No

Seed per pound
Seed spread rate

None

Seedling vigor
Small grain

No

Vegetative spread rate

Rapid

Paspalum

Classification

Group

Monocot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Liliopsida - Monocotyledons

Subclass

Commelinidae

Order

Cyperales

Family

Poaceae Barnhart - Grass family

Genus

Paspalum L. - crowngrass

Species

Paspalum hieronymi Hack. - paspalum

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA