North America Native Plant

Merlin’s Grass

Botanical name: Isoetes tegetiformans

USDA symbol: ISTE

Life cycle: perennial

Habit: grass

Native status: Native to the lower 48 states  

Merlin’s Grass: Georgia’s Mysterious and Endangered Quillwort If you’ve never heard of Merlin’s grass, you’re not alone. This isn’t your typical backyard plant, and despite its whimsical name, Isoetes tegetiformans is one of Georgia’s most endangered and enigmatic native species. This tiny quillwort might look like grass at first glance, ...

Rare plant alert!

Region: United States

Status: S1: Status is uncertain but is somewhere between the following rankings: Critically Imperiled: Extremely rare due to factor(s) making it especially vulnerable to extinction. Typically 5 or fewer occurrences or very few remaining individuals (<1,000) ⚘ Endangered: In danger of extinction throughout all or a significant portion of its range. ⚘

Region: United States

Merlin’s Grass: Georgia’s Mysterious and Endangered Quillwort

If you’ve never heard of Merlin’s grass, you’re not alone. This isn’t your typical backyard plant, and despite its whimsical name, Isoetes tegetiformans is one of Georgia’s most endangered and enigmatic native species. This tiny quillwort might look like grass at first glance, but it’s actually more closely related to ancient ferns than to any lawn you’ve ever seen.

What Exactly Is Merlin’s Grass?

Merlin’s grass is a quillwort, which puts it in a fascinating group of plants that are living fossils from prehistoric times. These aren’t true grasses at all, but rather primitive vascular plants that reproduce through spores instead of seeds or flowers. Think of them as the botanical equivalent of a time capsule – they’ve been around since before dinosaurs walked the Earth!

This perennial plant forms small tufts of narrow, quill-like leaves that emerge from a stubby underground stem called a corm. The leaves are typically just a few inches tall and have a distinctive appearance that sets them apart from true grasses once you know what to look for.

Where Does Merlin’s Grass Call Home?

Here’s where things get really specific – and concerning. Merlin’s grass is found only in Georgia, making it what botanists call an endemic species. This quillwort has incredibly specialized habitat requirements, thriving only in temporary pools and shallow depressions that flood during wet seasons and dry out completely during droughts.

A Plant in Crisis

Unfortunately, Merlin’s grass is in serious trouble. It carries a Global Conservation Status of S1, meaning it’s critically imperiled, and it’s listed as Endangered in the United States. With typically fewer than 5 occurrences and very few remaining individuals (less than 1,000), this little plant is hanging on by a thread.

The rarity of Merlin’s grass is largely due to its extremely specific habitat requirements and the loss of the temporary wetland pools it depends on. Development, changes in hydrology, and habitat destruction have severely impacted the places where this unique plant can survive.

Why You Won’t Find This in Garden Centers

Before you start planning where to plant Merlin’s grass in your yard, here’s the reality check: this isn’t a plant for home gardens. As an obligate wetland species, it requires very specific conditions that are nearly impossible to replicate in typical landscape settings:

  • Seasonal flooding and drying cycles
  • Specific soil chemistry and pH levels
  • Particular water depth and timing requirements
  • Absence of competition from other plants

Even if you could recreate these conditions, attempting to grow this critically endangered species would require responsibly sourced material, which is extremely rare and typically reserved for conservation efforts.

How to Identify Merlin’s Grass in the Wild

If you’re lucky enough to be exploring Georgia’s wetlands and think you might have spotted Merlin’s grass, here’s what to look for:

  • Small tufts of narrow, quill-like leaves
  • Leaves that are typically 2-4 inches tall
  • Growth in temporary pools or seasonal wetland depressions
  • Presence during wet seasons when pools are flooded
  • Often growing alongside other specialized wetland plants

Remember, if you do encounter this rare plant, observe from a distance and never collect or disturb it. Every individual matters when there are so few left.

Supporting Conservation Efforts

While you can’t grow Merlin’s grass in your backyard, you can still support its survival:

  • Support wetland conservation organizations
  • Advocate for protection of temporary wetland habitats
  • Choose native plants for your own garden that support local ecosystems
  • Report any suspected sightings to local botanists or conservation groups

Native Alternatives for Your Garden

If you’re interested in supporting Georgia’s native plant heritage in your own landscape, consider these wetland-loving natives that are more garden-appropriate:

  • Blue flag iris (Iris virginica)
  • Cardinal flower (Lobelia cardinalis)
  • Swamp milkweed (Asclepias incarnata)
  • Native sedges like Carex species

These plants will give you that connection to Georgia’s natural heritage while actually thriving in garden conditions and supporting local wildlife.

The Bigger Picture

Merlin’s grass serves as a reminder of how specialized and vulnerable some of our native species can be. While this particular plant isn’t destined for garden beds, its story highlights the importance of protecting the diverse habitats that make Georgia’s flora so unique. Sometimes the most important thing we can do as gardeners is simply appreciate these botanical treasures from afar and work to protect the wild spaces where they belong.

Merlin’s Grass

Classification

Group

Quillwort

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision
Division

Lycopodiophyta - Lycopods

Subdivision
Class

Lycopodiopsida

Subclass
Order

Isoetales

Family

Isoetaceae Dumort. - Quillwort family

Genus

Isoetes L. - quillwort

Species

Isoetes tegetiformans Rury - Merlin's grass

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