North America Native Plant

Indian Flatsedge

Botanical name: Cyperus nanus var. subtenuis

USDA symbol: CYNAS

Life cycle: perennial

Habit: grass

Native status: Native to Navassa Island âš˜ Native to Puerto Rico âš˜ Native to the U.S. Virgin Islands  

Synonyms: Cyperus subtenuis (Kük.) M.T. Strong (CYSU11)  âš˜  Mariscus capillaris (Sw.) Vahl (MACA13)   

Indian Flatsedge: A Charming Native Sedge for Caribbean Gardens If you’re looking for a low-maintenance native plant that brings subtle beauty to your Caribbean garden, let me introduce you to Indian flatsedge (Cyperus nanus var. subtenuis). This delicate little sedge might not be the showiest plant in your garden, but ...

Indian Flatsedge: A Charming Native Sedge for Caribbean Gardens

If you’re looking for a low-maintenance native plant that brings subtle beauty to your Caribbean garden, let me introduce you to Indian flatsedge (Cyperus nanus var. subtenuis). This delicate little sedge might not be the showiest plant in your garden, but it certainly earns its keep with reliable performance and authentic island charm.

What is Indian Flatsedge?

Indian flatsedge is a perennial sedge that belongs to the grass-like family of plants. Don’t let the name fool you – while it looks like grass, it’s actually a member of the sedge family (Cyperaceae). You might also encounter it under its scientific name or former names like Cyperus subtenuis or Mariscus capillaris, but Indian flatsedge rolls off the tongue much easier!

This charming little plant is a true Caribbean native, naturally occurring in Puerto Rico, the U.S. Virgin Islands, and Navassa Island. As a genuine island resident, it’s perfectly adapted to the unique challenges and beauty of Caribbean growing conditions.

Why Consider Indian Flatsedge for Your Garden?

Here’s where Indian flatsedge really shines – it’s the definition of low-maintenance gardening. This tough little plant has evolved to handle the coastal conditions that can make other plants struggle. Here are some compelling reasons to give it a try:

  • Native plant that supports local ecosystems
  • Extremely low maintenance once established
  • Tolerates coastal conditions including salt spray
  • Drought tolerant after establishment
  • Fine-textured foliage adds delicate beauty
  • Works well as ground cover or in naturalistic plantings

Garden Design and Landscape Uses

Indian flatsedge isn’t going to be your garden’s star performer, but it’s an excellent supporting cast member. Think of it as the reliable friend who’s always there when you need them. It works beautifully in:

  • Coastal gardens where salt tolerance is crucial
  • Naturalistic landscapes and native plant gardens
  • Rain gardens and areas with occasional flooding
  • Low-maintenance ground cover applications
  • Mixed plantings where you want fine-textured contrast

Its wetland status as Facultative Upland means it’s quite versatile – it usually prefers drier ground but can handle occasional wet conditions, making it perfect for those tricky spots that are sometimes soggy after heavy rains.

Growing Conditions and Care

One of the best things about Indian flatsedge is how easy it is to please. This plant is adapted to Caribbean conditions, so if you’re gardening in USDA zones 10-11, you’re in luck!

Light Requirements: Full sun to partial shade – it’s quite adaptable

Soil Preferences: Well-draining soils are preferred, but it can handle various soil types

Water Needs: Drought tolerant once established, though it appreciates occasional watering during dry spells

Climate: Thrives in tropical and subtropical climates (zones 10-11)

Planting and Care Tips

Getting Indian flatsedge established in your garden is refreshingly straightforward:

  • Plant during the warmer months when growth is most active
  • Space plants according to your desired coverage – closer for quicker ground cover
  • Water regularly during the first few weeks until roots establish
  • Once established, reduce watering – this plant prefers to dry out between waterings
  • Little to no fertilization needed – native plants prefer lean conditions
  • Minimal pruning required – just remove any dead or damaged growth as needed

Wildlife and Environmental Benefits

As a native plant, Indian flatsedge plays its part in supporting local wildlife, even if it’s not the most dramatic pollinator magnet. While it’s primarily wind-pollinated, it provides habitat structure for small creatures and contributes to the overall health of native plant communities.

Is Indian Flatsedge Right for Your Garden?

Indian flatsedge is perfect for gardeners who appreciate subtle beauty and want to support native plant communities with minimal effort. It’s especially valuable if you’re dealing with challenging coastal conditions or want reliable ground cover that won’t demand constant attention.

However, if you’re looking for bold, showy flowers or dramatic foliage, this might not be your plant. Its beauty lies in its delicate texture and reliable performance rather than eye-catching displays.

Consider Indian flatsedge as part of a diverse native plant palette, where its fine texture and adaptability can complement more dramatic neighbors while providing essential ecological benefits. Sometimes the most valuable garden residents are the ones that quietly do their job without demanding the spotlight!

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

Caribbean

FACU

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

Indian Flatsedge

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

Cyperus L. - flatsedge

Species

Cyperus nanus Willd. - Indian flatsedge

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