North America Native Plant

Sedge

Botanical name: Carex ×zahnii

USDA symbol: CAZA4

Life cycle: perennial

Habit: grass

Native status: Native to Greenland  

Carex ×zahnii: The Mysterious Greenland Sedge If you’re a plant enthusiast who loves a good botanical mystery, then Carex ×zahnii might just capture your imagination. This elusive sedge is one of those plants that keeps even seasoned gardeners guessing, and for good reason – it’s about as rare in cultivation ...

Carex ×zahnii: The Mysterious Greenland Sedge

If you’re a plant enthusiast who loves a good botanical mystery, then Carex ×zahnii might just capture your imagination. This elusive sedge is one of those plants that keeps even seasoned gardeners guessing, and for good reason – it’s about as rare in cultivation as a unicorn in your backyard!

What Is Carex ×zahnii?

Carex ×zahnii is a perennial hybrid sedge that belongs to the Cyperaceae family. The little × symbol in its name is botanical speak for hybrid, meaning this plant is the result of two different sedge species getting together and creating something new. Like other sedges, it’s a grass-like plant that forms part of the diverse world of graminoids – those wonderful grass-like plants that add texture and movement to gardens.

Where Does It Come From?

This mysterious sedge calls Greenland its home – yes, that massive, icy island between the Arctic and Atlantic oceans. Being native to Greenland gives us a pretty big clue about its preferences: this is likely one tough, cold-hardy customer that’s adapted to some pretty extreme conditions.

Should You Try to Grow It?

Here’s where things get interesting (and a bit frustrating). While Carex ×zahnii might sound like an exciting addition to your garden, there’s a catch – it’s virtually unavailable in the horticultural trade. Information about its cultivation, appearance, and growing requirements is extremely limited, making it more of a botanical curiosity than a practical garden choice.

The Reality Check

For most gardeners, Carex ×zahnii falls into the nice to know about but impossible to grow category. Since it’s a hybrid species with such limited documentation, you’re unlikely to find it at your local nursery or even specialty plant sales. Its rarity means that even if you could source it, you’d be venturing into uncharted gardening territory without much guidance.

Better Alternatives for Your Garden

If you’re drawn to the idea of growing sedges (and you should be – they’re fantastic plants!), consider these more readily available and well-documented options:

  • Native sedges from your local region that provide similar grass-like texture
  • Well-established sedge cultivars that offer reliable performance
  • Other cold-hardy graminoids that can handle tough conditions

The Takeaway

While Carex ×zahnii remains an intriguing botanical puzzle piece, it’s not a practical choice for most gardeners. Its extreme rarity and lack of cultivation information make it more suitable for botanical collections or research than home gardens. Instead, focus your energy on the many wonderful, well-documented sedges that can bring that same grass-like elegance to your landscape without the mystery and frustration.

Sometimes the most interesting plants are the ones we can admire from afar while appreciating the more accessible beauties right in our own gardens!

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 ×zahnii Kneucker - sedge

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