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Carex grayi 'New Moon Mighty'

New Moon Mighty grays sedge

Native to North America (selection)


FIRST IMPRESSIONS:  Carex grayi ‘New Moon Mighty’ is a perennial sedge that forms attractive quickly spreading clumps.  New Moon Mighty is a more aggressive selection. The narrow leaves are shiny, upright and are usually semi-evergreen.  In early summer greenish spherical flower spikes are held above the graceful shaggy foliage.  The unique flowers resemble a starburst even after they transition into warm brown seed clusters. This sedge prospers in part sun to part shade in moist or wet soils. Plants tolerate full sun if abundant moisture is present.

HABITAT & HARDINESS:  Carex grayi ‘New Moon Mighty’s parent plant is native to Ontario, Quebec and most of the eastern and central United States.

Plants are indigenous to moist or wet deciduous forests, sandy swamps, wet depressions, shaded seeps, wet prairies, marshes and margins of creek and rivers.  This sedge is usually found in wet soils but may occasionally move into nearby mesic woodlands.

Hardy from USDA Zones 5-9.

PLANT DESCRIPTION:  Carex grayi ‘New Moon Mighty’ forms loose tufts of arching glossy foliage. Leaves are about ½” wide and 14” long.  They are lime green and pleated.  Plants gradually form colonies from short underground rhizomes.

Leafy culms rise above the basal foliage to 2½’.  Each culm is topped with a staminate spikelet and 2 unique pistillate spikelets. 

The pistillate spikelets are globe shaped.  They consist of 10-35 inflated light green diamond shaped perigynia.  The perigynia taper to sharp points which radiate in all directions.  The overall appearance is reminiscent of a Morning Star which is a medieval spiked club type weapon similar to a mace.

As seed begins to form, the spherical spikes transition from green to golden brown.

This sedge is up to 2.5’ tall with a 2’ spread.

CULTURAL & MAINTENANCE NEEDS: Carex grayi ‘New Moon Mighty’ grows best in part sun or part shade.  Plants thrive in wet or moist conditions and tolerate seasonal flooding.  Soil preference is for a loam, silt or sand that is high in organic matter.

Plants are pest resistant and unpalatable to deer and other herbivores.

If this highly ornamental sedge is planted in a garden situation, foliage should be cut to the ground during late winter.

LANDSCAPE USES:  Carex grayi ‘New Moon Mighty’ is useful in difficult wet shady niches.   This sedge performs well in wet meadows and is a good component for a Grouping or Mass Planting.   Plants provide Erosion Control, Showy Flowers and Winter Interest and are appropriate for Deer Resistant Plantings, Low Maintenance Plantings, Rain Gardens, Restoration Projects and Wildlife Gardens.

COMPANION & UNDERSTUDY PLANTS:  Suitable companions for Carex grayi ‘New Moon Mighty’ can range from prairie plants to residents of wet woodlands.  A few possibilities are:  Aster novae-angliaeChasmanthium latifolium, Lobelia siphilitica and Sorghastrum nutans.

Carex grayi or Carex amphiloba could be substituted if needed.  The two sedges have similar cultural needs but C. amphiloba is much shorter.


3-4 ft


1-2 ft

USDA Hardiness Zone:


Bloom Color:


Carex grayi 'New Moon Mighty' Characteristics

Attracts Wildlife

  • Pollinators
  • Songbirds


  • Long Blooming
  • Ground Cover
  • Dried Flower
  • Rain Garden
  • Cut Flower
  • Bog
  • Reblooming
  • Naturalizing


  • Full Sun to Partial Shade

Deer Resistant

  • Deer Resistant

Flowering Months

  • September
  • August
  • July
  • June
  • May
  • October

Foliage Color

  • Green

Grass Season

  • Cool Season Grass

Groundcover Foot-Traffic Tolerances

  • Light

Juglans nigra Tolerance (Black Walnut)

  • Yes

Lawn Replacement or Groundcover

  • Groundcover

Season of Interest (Foliage)

  • Fall
  • Summer
  • Spring

Soil Moisture Preference

  • Moist to Wet

Plants that work well with Carex grayi 'New Moon Mighty'

Northern seaoates Northern seaoates (Chasmanthium latifolium)
New England aster New England aster (Aster novae-angliae)
Great Blue Lobelia Great Blue Lobelia (Lobelia siphilitica)

Substitutions for Carex grayi 'New Moon Mighty'

Creek sedge Creek sedge (Carex amphibola)