Cotton Deergrass

trichophorum alpinum

Cotton Deergrass is a delicate, perennial sedge that brings a touch of softness to cold northern wetlands, fens, and peat bogs. Growing in dense, grassy clumps, this hardy plant is famous for the fluffy, cotton-like seed heads that develop after it flowers, transforming barren boggy landscapes into shimmering fields of white. It serves as an important ecological pioneer, stabilizing waterlogged soils and contributing to the slow, ancient process of peat formation. Its presence is highly indicative of pristine, undisturbed wetland ecosystems.

Habitat: Found in cold, acidic peatlands, fens, and subalpine bogs across northern temperate and boreal regions.

Appearance

This perennial sedge grows in compact tufts reaching 10 to 40 centimeters in height, characterized by slender, erect, and slightly triangular grayish-green stems. In early spring, it produces small, inconspicuous brown flower spikelets at the tips of its stems. As summer progresses, these flowers give way to dazzling, silky white bristles that extend outward up to 2 centimeters, creating a distinctive cotton-ball appearance that makes the plant highly visible against dark wetland backgrounds.

KingdomPlantaePhylumTracheophytaClassLiliopsidaOrderPoalesFamilyCyperaceaeGenusTrichophorum

Cotton Deergrass

Interesting facts

Despite its common name, Cotton Deergrass is a true sedge belonging to the Cyperaceae family rather than a true grass.

Historically, the soft, downy bristles of deergrasses and cottongrasses were harvested in northern regions to stuff pillows and mattresses when feathers were scarce.

The fluffy 'cotton' of this plant is actually made of highly modified sepals and petals that elongate into woolly bristles after pollination.

Special abilities

Utilizes a dense, creeping network of rhizomes to anchor itself securely in waterlogged, shifting peat soils, preventing soil erosion.

Develops long, ultra-lightweight cottony bristles that act as sails, allowing mountain and wetland breezes to carry its seeds over vast distances.

Thrives in highly acidic, nutrient-deficient soils by highly efficiently conserving and recycling essential minerals within its perennial root systems.

Measurements & details

Length: 10-40 cm
Lifespan: 3-10 years

Diet & Feeding

As a photoautotrophic plant, Cotton Deergrass produces its own energy via photosynthesis, utilizing sunlight, carbon dioxide, and water while absorbing key minerals from its acidic substrate.

Primary Foods

Sunlight
Carbon dioxide
Water
Soil minerals

Ecological connections

eaten by

Tundra Vole

Microtus oeconomus

The fresh shoots and nutrient-dense seeds of Cotton Deergrass are consumed by tundra voles during the summer months.

mutualism

Northern Peatmoss

Sphagnum capillifolium

Cotton Deergrass grows in close association with sphagnum mosses, which help maintain the acidic, moist conditions the sedge needs to survive.

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Safety

Danger

1/5 · Very low

No special safety notes yet.

Frequently Asked Questions

How to identify Cotton Deergrass?

The easiest way to identify Cotton Deergrass is to use the Snappit nature identifier app.

How long is Cotton Deergrass?

10-40 cm

How long does Cotton Deergrass live?

3-10 years

What does Cotton Deergrass eat?

As a photoautotrophic plant, Cotton Deergrass produces its own energy via photosynthesis, utilizing sunlight, carbon dioxide, and water while absorbing key minerals from its acidic substrate.

Where is Cotton Deergrass usually found?

Found in cold, acidic peatlands, fens, and subalpine bogs across northern temperate and boreal regions.