North America Non-native Plant

Carex ×calderi

Botanical name: Carex ×calderi

USDA symbol: CACA90

Habit: grass

Native status: Not native but doesn't reproduce and persist in the wild

Carex ×calderi: The Mystery Sedge That Might Leave You Scratching Your Head If you’ve stumbled across the name Carex ×calderi while browsing plant lists or botanical databases, you’re not alone in wondering what exactly this sedge is all about. The × symbol in the name tells us this is a ...

Carex ×calderi: The Mystery Sedge That Might Leave You Scratching Your Head

If you’ve stumbled across the name Carex ×calderi while browsing plant lists or botanical databases, you’re not alone in wondering what exactly this sedge is all about. The × symbol in the name tells us this is a hybrid sedge, but here’s the thing – finding solid, reliable information about this particular plant is like searching for a needle in a haystack.

What We Know (And What We Don’t)

Carex ×calderi belongs to the sedge family (Cyperaceae), making it a grass-like plant that’s related to the more familiar sedges you might know from wetland areas or shade gardens. As a hybrid, it’s the result of two parent sedge species crossing, but the details about its characteristics, native range, and growing requirements remain frustratingly unclear in available botanical literature.

The geographical distribution of this hybrid sedge is not well documented, which makes it difficult to provide specific growing advice or understand its ecological role.

The Challenge with Obscure Hybrids

Here’s where things get a bit tricky for us gardeners. Without clear information about:

  • Its mature size and growth habit
  • Preferred growing conditions
  • Hardiness zones
  • Wildlife and pollinator value
  • Availability in the nursery trade

It’s nearly impossible to give you solid advice about whether this sedge would work in your garden or how to grow it successfully.

Better Alternatives: Well-Known Native Sedges

Instead of chasing after this botanical mystery, why not consider some fantastic native sedges that are well-documented, readily available, and proven garden performers? Here are some crowd-pleasers:

  • Pennsylvania Sedge (Carex pensylvanica) – Perfect for dry shade and lawn alternatives
  • Appalachian Sedge (Carex appalachica) – Great for woodland gardens
  • Fox Sedge (Carex vulpinoidea) – Excellent for rain gardens and wet areas
  • Prairie Dropseed (Sporobolus heterolepis) – While technically a grass, it offers similar texture

The Bottom Line

While Carex ×calderi might sound intriguing, the lack of available growing information makes it a risky choice for most gardeners. Your time and garden space are precious, so why not invest in native sedges with proven track records? These alternatives will give you the grass-like texture and ecological benefits you’re looking for, plus the peace of mind that comes with reliable growing information.

If you’re determined to track down this elusive hybrid, your best bet would be contacting botanical gardens, native plant societies, or sedge specialists who might have more detailed knowledge about its requirements and availability.

Carex ×calderi

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 ×calderi B. Boivin

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