North America Native Plant

Slender Fimbry

Botanical name: Fimbristylis autumnalis

USDA symbol: FIAU2

Life cycle: annual

Habit: grass

Native status: Native to Canada âš˜ Native to the lower 48 states  

Synonyms: Fimbristylis autumnalis (L.) Roem. & Schult. var. mucronulata (Michx.) Fernald (FIAUM)  âš˜  Fimbristylis geminata (Nees) Kunth (FIGE3)  âš˜  Scirpus autumnalis L. (SCAU4)   

Slender Fimbry: A Delicate Native Sedge for Wet Areas If you’re looking to add some fine-textured charm to your garden’s wet spots, meet slender fimbry (Fimbristylis autumnalis) – a graceful little sedge that’s as practical as it is pretty. This unassuming native annual has been quietly beautifying North America’s wetlands ...

Slender Fimbry: A Delicate Native Sedge for Wet Areas

If you’re looking to add some fine-textured charm to your garden’s wet spots, meet slender fimbry (Fimbristylis autumnalis) – a graceful little sedge that’s as practical as it is pretty. This unassuming native annual has been quietly beautifying North America’s wetlands for centuries, and it’s ready to work its magic in your landscape too.

What Makes Slender Fimbry Special?

Don’t let the word slender fool you into thinking this plant is fragile. Slender fimbry is a tough little annual sedge that belongs to the grass-like family of plants called graminoids. While it may look delicate with its fine, narrow leaves and airy clusters of tiny brown flowers, this native beauty is perfectly adapted to handle wet conditions that would drown many other plants.

The plant gets its name from its slender appearance and its tendency to bloom in autumn, producing small but charming flower clusters that add subtle texture to the landscape. It’s definitely more about understated elegance than bold drama – think of it as the quiet friend who always makes the group look better.

Where Does Slender Fimbry Call Home?

This native gem has quite the impressive range! Slender fimbry is native to both Canada and the lower 48 states, making appearances from the Maritime provinces all the way down to Florida and Texas. You’ll find it naturally occurring in states spanning from Maine to California, though it’s most common in the eastern and central regions of North America.

The Wet and Wonderful World of Slender Fimbry

Here’s where things get interesting – slender fimbry is what we call a wetland specialist. Depending on where you live, this plant ranges from being a facultative wetland species (usually found in wet areas but can handle some drier conditions) to an obligate wetland plant (almost always found in wet areas). This makes it absolutely perfect for:

  • Rain gardens and bioswales
  • Pond edges and stream banks
  • Naturalized wetland areas
  • Native plant gardens with consistent moisture
  • Wildlife habitat restoration projects

Growing Slender Fimbry Successfully

The beauty of slender fimbry lies in its simplicity. As an annual, it completes its entire life cycle in one growing season, but don’t worry about replanting every year – this little self-seeder often takes care of that for you!

Growing Conditions

Slender fimbry thrives in USDA hardiness zones 4-9 and prefers:

  • Moist to wet soil conditions
  • Full sun to partial shade
  • Areas that can handle seasonal flooding
  • Clay, loam, or sandy soils as long as they stay moist

Planting and Care Tips

Getting started with slender fimbry is refreshingly straightforward:

  • Direct seed in fall or early spring when soil is naturally moist
  • Scatter seeds in prepared wet areas and lightly rake in
  • Keep soil consistently moist during germination
  • Once established, this low-maintenance native needs little care
  • Allow plants to go to seed for natural reseeding

Why Your Garden (and Local Wildlife) Will Love It

While slender fimbry might not be the showiest plant in your garden, it pulls its weight in the ecosystem department. The seeds provide food for waterfowl and songbirds, while the plant structure offers habitat and nesting material for beneficial insects. It’s like having a small wildlife diner right in your backyard!

Plus, as a native species, it supports local ecosystems without any of the concerns that come with non-native plants. It knows how to play nicely with its neighbors and won’t try to take over your garden.

Is Slender Fimbry Right for Your Garden?

Slender fimbry is perfect for gardeners who:

  • Have consistently wet or seasonally flooded areas
  • Want to support native wildlife
  • Appreciate subtle, naturalistic beauty
  • Prefer low-maintenance plants
  • Are working on wetland restoration or rain garden projects

However, it might not be the best choice if you have dry garden conditions or are looking for bold, showy flowers. This plant is all about quiet charm and ecological function rather than flashy aesthetics.

The Bottom Line

Slender fimbry proves that sometimes the best garden additions are the ones that work behind the scenes. This native sedge brings authentic local character to wet areas while providing valuable ecosystem services. It’s the perfect choice for gardeners who want to create beautiful, functional landscapes that support local wildlife and handle challenging wet conditions with grace.

So if you’ve got a soggy spot that needs some love, consider giving slender fimbry a try. Your local birds, beneficial insects, and the environment will thank you for it!

Wetland Status

The rule of seasoned gardeners and landscapers is to choose the "right plant for the right place" matching plants to their ideal growing conditions, so they'll thrive with less work and fewer inputs. But the simplicity of this catchphrase conceals how tricky plant selection is. While tags list watering requirements, there's more to the story.

Knowing a plant's wetland status can simplify the process by revealing the interaction between plants, water, and soil. Surprisingly, many popular landscape plants are wetland species! And what may be a wetland plant in one area, in another it might thrive in drier conditions. Also, it helps you make smarter gardening choices and grow healthy plants with less care and feeding, saving you time, frustration, and money while producing an attractive garden with greater ecological benefits.

Regions
Status
Moisture Conditions

Arid West

OBL

Obligate Wetland - Plants with this status almost always occurs in wetlands

Atlantic and Gulf Coastal Plain

OBL

Obligate Wetland - Plants with this status almost always occurs in wetlands

Eastern Mountains and Piedmont

FACW

Facultative Wetland - Plants with this status usually occurs in wetlands but may occur in non-wetlands

Great Plains

OBL

Obligate Wetland - Plants with this status almost always occurs in wetlands

Hawaii

FAC

Facultative - Plants with this status can occur in wetlands and non-wetlands

Midwest

OBL

Obligate Wetland - Plants with this status almost always occurs in wetlands

Northcentral & Northeast

FACW

Facultative Wetland - Plants with this status usually occurs in wetlands but may occur in non-wetlands

Western Mountains, Valleys, and Coast

OBL

Obligate Wetland - Plants with this status almost always occurs in wetlands

Slender Fimbry

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

Cyperaceae Juss. - Sedge family

Genus

Fimbristylis Vahl - fimbry

Species

Fimbristylis autumnalis (L.) Roem. & Schult. - slender fimbry

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