North America Native Plant

Longleaf Cupgrass

Botanical name: Eriochloa michauxii

USDA symbol: ERMI3

Life cycle: annual

Habit: grass

Native status: Native to the lower 48 states  

Longleaf Cupgrass: A Hidden Gem for Southeastern Wetland Gardens If you’re looking to create an authentic southeastern landscape that supports local wildlife while handling those soggy spots in your yard, longleaf cupgrass (Eriochloa michauxii) might just be the unsung hero you’ve been searching for. This modest native grass may not ...

Rare plant alert!

Region: Conservation status by state

Status: S3S4: Status is uncertain but is somewhere between the following rankings: Vulnerable: Either very rare and local throughout its range, found only in a restricted range (even if abundant at some locations), or factors are making it vulnerable to extinction. Typically 21 to 100 occurrences or between 3,000 and 10,000 individuals ⚘ Apparently Secure: Uncommon but not rare, and usually widespread. Possibly cause for longterm concern. Typically more than 100 occurrences in the state or more than 10,000 individuals ⚘

Longleaf Cupgrass: A Hidden Gem for Southeastern Wetland Gardens

If you’re looking to create an authentic southeastern landscape that supports local wildlife while handling those soggy spots in your yard, longleaf cupgrass (Eriochloa michauxii) might just be the unsung hero you’ve been searching for. This modest native grass may not win any beauty contests, but it’s a workhorse that deserves a place in every native plant enthusiast’s toolkit.

What Makes Longleaf Cupgrass Special?

Longleaf cupgrass is a true southeastern native, calling the coastal plains of Alabama, Florida, Georgia, and South Carolina home. As both an annual and perennial (depending on conditions), this adaptable grass has been quietly doing its job in wetland ecosystems for centuries, providing stability to soil and food for wildlife.

This grass grows naturally across the southeastern coastal states, thriving in the region’s unique wetland environments.

Garden Appeal and Landscape Role

Let’s be honest – longleaf cupgrass won’t stop traffic with flashy flowers or dramatic foliage. What it lacks in showiness, though, it makes up for in authentic charm and ecological function. This fine-textured grass forms small, neat clumps with narrow leaves and produces delicate seed heads in late summer to fall that add subtle movement and texture to the landscape.

In garden design, longleaf cupgrass serves as:

  • Natural groundcover for wet areas
  • Texture contrast in native plant gardens
  • Authentic regional character in restoration projects
  • Erosion control along water features

Perfect Garden Settings

This grass shines in specific landscape situations where other plants might struggle:

  • Rain gardens: Handles periodic flooding like a champ
  • Wetland restoration projects: Provides authentic native habitat
  • Naturalized landscapes: Adds regional authenticity
  • Pond margins: Tolerates wet feet beautifully

Growing Conditions and Care

Longleaf cupgrass is refreshingly low-maintenance once you understand its preferences. This grass thrives in USDA hardiness zones 8-10, which perfectly matches its natural southeastern range.

Ideal growing conditions include:

  • Moisture: Prefers consistently moist to wet soils
  • Light: Full sun to partial shade
  • Soil: Adaptable but prefers naturally moist conditions
  • Flooding tolerance: Handles periodic inundation well

Planting and Care Tips

Getting longleaf cupgrass established is surprisingly straightforward:

  • Best planting time: Fall seeding works best for natural germination cycles
  • Soil prep: Minimal preparation needed in naturally moist areas
  • Watering: Ensure consistent moisture during establishment
  • Maintenance: Virtually none once established – let nature take its course

Wildlife and Ecological Benefits

While longleaf cupgrass may not attract butterflies like flashy wildflowers do, it plays a crucial role in the ecosystem. The seeds provide food for various bird species, and the grass structure offers shelter for small wildlife. As a wetland species, it also helps filter water and prevent erosion.

A Word About Conservation

Here’s something important to know: longleaf cupgrass has a conservation status that suggests it’s becoming less common in some areas. If you decide to grow this grass, make sure to source it responsibly from reputable native plant suppliers who propagate their own stock rather than wild-collecting.

Should You Plant Longleaf Cupgrass?

If you have wet areas in your southeastern garden and want to create authentic native habitat, absolutely! This grass is perfect for gardeners who appreciate subtle beauty and want to support local ecosystems. Just remember that it’s not the right choice for dry, upland areas – save those spots for other southeastern natives.

Longleaf cupgrass proves that sometimes the most valuable plants are the ones that work quietly behind the scenes, supporting the intricate web of life that makes our native landscapes so special.

Longleaf Cupgrass

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

Eriochloa Kunth - cupgrass

Species

Eriochloa michauxii (Poir.) Hitchc. - longleaf cupgrass

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