North America Native Plant

Herbst’s Sedge

Botanical name: Carex wahuensis herbstii

USDA symbol: CAWAH

Life cycle: perennial

Habit: grass

Native status: Native to Hawaii  

Herbst’s Sedge: A Rare Hawaiian Native Worth Protecting If you’ve stumbled across Herbst’s sedge in your search for native Hawaiian plants, you’ve discovered one of the islands’ more elusive botanical treasures. This isn’t your typical garden center find – Carex wahuensis herbstii is a rare native sedge that calls Hawaii ...

Rare plant alert!

Region: Conservation status by state

Status: S3T1: Status is uncertain but is somewhere between the following rankings: Subspecies or variety is 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) ⚘ 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 ⚘

Herbst’s Sedge: A Rare Hawaiian Native Worth Protecting

If you’ve stumbled across Herbst’s sedge in your search for native Hawaiian plants, you’ve discovered one of the islands’ more elusive botanical treasures. This isn’t your typical garden center find – Carex wahuensis herbstii is a rare native sedge that calls Hawaii home and deserves our respect and protection.

What Makes This Sedge Special?

Herbst’s sedge is a perennial grass-like plant that belongs to the sedge family (Cyperaceae). Like other sedges, it has that distinctive triangular stem that sets it apart from true grasses – though you’d need to look pretty closely to notice the difference! This particular variety is named after someone called Herbst, likely a botanist who contributed to our understanding of Hawaiian flora.

Where You’ll Find It (Hint: Pack Your Passport)

Here’s where things get interesting – and a bit limiting for most of us mainland gardeners. Herbst’s sedge is endemic to Hawaii, meaning it naturally occurs nowhere else on Earth. This little plant has made the Hawaiian islands its one and only home for countless generations.

The Rarity Reality Check

Before you get too excited about adding this beauty to your garden, there’s something important you need to know. Herbst’s sedge has a Global Conservation Status of S3T1, which puts it in the rare category. This isn’t just garden-variety uncommon – this plant is genuinely at risk.

What does this mean for you as a gardener? If you’re lucky enough to find this plant available (which is highly unlikely), make absolutely sure it comes from responsibly sourced material. Never, ever collect plants from the wild, and be extremely cautious about any sources that can’t prove their plants were propagated ethically.

Growing Herbst’s Sedge: The Honest Truth

Here’s where I have to be completely upfront with you – reliable cultivation information for Herbst’s sedge is practically non-existent. This isn’t because it’s a difficult plant (though it might be), but because it’s so rare that very few people have experience growing it.

What we do know is that it’s a perennial sedge native to Hawaii’s unique climate and growing conditions. If you’re in Hawaii and seriously interested in growing native sedges, your best bet is to:

  • Connect with local native plant societies
  • Contact Hawaiian botanical gardens for guidance
  • Work with conservation groups who might have propagation programs
  • Consider growing other, more available Hawaiian native sedges instead

The Big Picture

Sometimes the most valuable plants aren’t the ones we grow in our gardens – they’re the ones we help protect in their natural habitats. Herbst’s sedge represents the incredible biodiversity that makes Hawaii’s flora so special, and it reminds us that not every beautiful plant is meant for cultivation.

If you’re passionate about Hawaiian native plants but can’t access Herbst’s sedge (which is likely), consider supporting conservation efforts or growing other native Hawaiian species that are more readily available and better understood horticulturally.

After all, the best way to appreciate some plants is simply knowing they exist and doing our part to make sure they continue to thrive where they belong – in the wild, in their native Hawaiian home.

Herbst’s Sedge

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

Carex L. - sedge

Species

Carex wahuensis C.A. Mey. - Oahu sedge

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