Native Plants

Bumpy Jointtail Grass

Coelorachis tuberculosa

USDA symbol: COTU

perennial grass

Lower 48 states: native

If you’re passionate about native plant conservation and have the right wet conditions, bumpy jointtail grass (Coelorachis tuberculosa) might just be the specialized addition your wetland garden has been waiting for. This delicate perennial grass is far from ordinary – it’s a vulnerable species that plays an important role in ...

Bumpy Jointtail Grass may be listed as rare in your area.
Global Conservation Status

Status: S3 | Vulnerable: Found only in a restricted range (even if abundant at some locations). Typically 21 to 100 occurrences or between 3,000 and 10,000 individuals.

Florida

Status: S1 | Critically imperiled: Typically 5 or fewer occurrences or under 1,000 remaining individuals.

Bumpy Jointtail Grass: A Rare Native Treasure for Wetland Gardens

If you’re passionate about native plant conservation and have the right wet conditions, bumpy jointtail grass (Coelorachis tuberculosa) might just be the specialized addition your wetland garden has been waiting for. This delicate perennial grass is far from ordinary – it’s a vulnerable species that plays an important role in our southeastern wetland ecosystems.

What Makes Bumpy Jointtail Grass Special?

Bumpy jointtail grass is a fine-textured native grass that brings subtle beauty rather than showy blooms to the garden. Don’t expect flashy flowers – this grass-like plant offers quiet charm through its narrow leaves and inconspicuous flowering spikes. What it lacks in dramatic appeal, it makes up for in ecological importance and rarity.

This perennial grass belongs to the Poaceae family and may also be found in scientific literature under its synonyms Manisuris tuberculosa or Mnesithea tuberculosa.

Where Does It Call Home?

Bumpy jointtail grass is native to a relatively small corner of the southeastern United States, naturally occurring in Alabama, Florida, and Georgia. This limited range is part of what makes it so special – and so vulnerable.

  • Species observed
  • No observations

A Plant That Needs Our Help

Here’s something important every potential grower should know: bumpy jointtail grass has a global conservation status of S3, meaning it’s considered vulnerable throughout its range. In Alabama and Florida, it’s even rarer with an S1 status. This means if you’re considering adding it to your garden, you’ll want to source it responsibly from reputable native plant nurseries or conservation organizations – never collect it from the wild.

Perfect for Wetland Warriors

This grass isn’t for your average garden bed. Bumpy jointtail grass is classified as an obligate wetland species, meaning it almost always occurs in wetlands and requires consistently moist to wet conditions. If you have a bog garden, rain garden, or wetland restoration project, this could be your plant.

Growing Conditions:

  • Soil: Consistently moist to wet, tolerates seasonal flooding
  • Light: Full sun to partial shade
  • USDA Zones: 8-10 (southeastern coastal regions)
  • Water: High moisture requirements – not drought tolerant

Garden Role and Landscape Use

Think of bumpy jointtail grass as a supporting actor rather than the star of your wetland show. It provides fine texture and authentic native character to:

  • Wetland restoration projects
  • Native plant preserves
  • Specialized bog gardens
  • Rain gardens with consistent moisture
  • Conservation-focused landscapes

Wildlife and Ecological Benefits

As a wind-pollinated grass, bumpy jointtail grass doesn’t attract showy butterflies or bees like flowering plants do. However, it contributes to wetland ecosystem health and may provide nesting materials for insects. Its real value lies in preserving authentic native plant communities and supporting the broader wetland ecosystem.

Planting and Care Tips

Growing bumpy jointtail grass successfully requires commitment to its specialized needs:

  • Source plants responsibly from conservation-minded nurseries
  • Ensure consistent moisture – this plant won’t survive in regular garden soil
  • Plant in spring when soil temperatures warm
  • Minimal fertilization needed in wetland conditions
  • Once established in proper conditions, maintenance is minimal
  • Allow natural seasonal cycles including potential dormancy

Should You Grow It?

Bumpy jointtail grass isn’t for everyone, and that’s okay. Consider this plant if you:

  • Have genuine wetland conditions in your landscape
  • Are passionate about native plant conservation
  • Want to support rare and vulnerable species
  • Have access to responsibly sourced plants
  • Appreciate subtle, naturalistic beauty over flashy displays

If you don’t have wetland conditions but want to support native grasses, consider other southeastern native grass species that are more adaptable to regular garden conditions.

By choosing to grow bumpy jointtail grass responsibly, you’re not just adding a plant to your garden – you’re participating in conservation efforts to preserve a vulnerable piece of our native plant heritage. Just remember: with great rarity comes great responsibility to source and grow it ethically.

Coelorachis tuberculosa is also known as...

Often we refer to plants by their common names. When shopping for plants the scientific name is the best way to positively identify the plant species you desire. But some plants have more than one name! While it doesn't happen often, nurseries might display one name while you're searching for another. Coelorachis tuberculosa is also known as:

Manisuris tuberculosa | USDA symbol: MATU2
Mnesithea tuberculosa Koning & | USDA symbol: MNTU

Why do some plants have more than one name? Over time plant species may be renamed for a few reasons:

  1. Botanists in different regions named the same plant without knowing it had already been classified.
  2. A species was reclassified after scientific advances in, for example, DNA analysis.
  3. Slight variations within a species are sometimes mistakenly identified as entirely new species.

Classification

Group: Monocot
Kingdom: Plantae - Plants
Subkingdom: Tracheobionta - Vascular plants
Superdivision: Spermatophyta - Seed plants
Division: Magnoliophyta - Flowering plants
Class: Liliopsida - Monocotyledons
Subclass: Commelinidae
Order: Cyperales
Family: Poaceae Barnhart - Grass family
Genus: Coelorachis Brongn. - jointtail grass

Species: Coelorachis tuberculosa (Nash) Nash - bumpy jointtail grass

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