Rusty Cottongrass Eriophorum virginicum
Other Common Name(s):
- Phonetic Spelling
- er-ee-OH-for-um vir-JIN-ih-kum
- Description
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This unique sedge, with flowers that look a bit like a shaving brush, is a perennial. It grows in bogs, wet meadows, and many other places with sun and damp or wet soil. It is one of many cottongrass (common name) cultivars with a flower that has a white to tan bristly appearing but soft, cotton like mass 1 to 2 inches across. Many cottongrass blooms are white but this one is often tawny (light brown) in color, hence one of its common names of Tawny cottongrass. It blooms from June to September. The flowers are perfect, meaning both male and female parts are present.
The lowest 2 to 5 spikes of flowers each have a leaf-like bract (part between flower and stem) at the base of the stalk, of varying lengths, up to 5 or 6 inches long, and may be upward or downward pointing.
The leaves are flat, grasslike and few in number, alternating on the stem. The leaves are simple, meaning that each is a single leaf attached to a stem or twig. This leaf is smooth and hairless.
The sedge is densely clump forming and grows from spreading rhizomes under the soil. It is not common in NC but is native, in general, throughout the eastern half of the U.S. It is more commonly found in northern cooler states.
- See this plant in the following landscape:
- Cultivars / Varieties:
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- Cultivars / Varieties:
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Attributes:
- Genus:
- Eriophorum
- Species:
- virginicum
- Family:
- Cyperaceae
- Life Cycle:
- Perennial
- Country Or Region Of Origin:
- E. Canada to N. Central & E. U.S.A.
- Distribution:
- Widely in eastern US and Newfoundland
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Whole Plant Traits:
- Plant Type:
- Ornamental Grasses and Sedges
- Perennial
- Habit/Form:
- Clumping
- Creeping
- Spreading
- Maintenance:
- Low
- Texture:
- Medium
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Cultural Conditions:
- Light:
- Full sun (6 or more hours of direct sunlight a day)
- Partial Shade (Direct sunlight only part of the day, 2-6 hours)
- Soil Texture:
- High Organic Matter
- Loam (Silt)
- Soil Drainage:
- Moist
- Occasionally Wet
- Available Space To Plant:
- 12 inches-3 feet
- NC Region:
- Coastal
- Mountains
- Piedmont
- USDA Plant Hardiness Zone:
- 3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a
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Fruit:
- Fruit Color:
- Black
- Brown/Copper
- White
- Display/Harvest Time:
- Summer
- Fruit Length:
- < 1 inch
- Fruit Width:
- < 1 inch
- Fruit Description:
- Seeds are 4 mm or less in length.
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Flowers:
- Flower Color:
- Cream/Tan
- Green
- White
- Flower Inflorescence:
- Spike
- Flower Value To Gardener:
- Long Bloom Season
- Showy
- Flower Bloom Time:
- Summer
- Flower Size:
- 1-3 inches
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Leaves:
- Leaf Color:
- Green
- Leaf Type:
- Simple
- Leaf Arrangement:
- Alternate
- Leaf Shape:
- Linear
- Hairs Present:
- No
- Leaf Length:
- > 6 inches
- Leaf Width:
- < 1 inch
- Leaf Description:
- The smooth leaf is flat at the base with a short sheath and a total length of about 12 inches. The leaf can be round or triangular in cross section, about 4 mm wide.
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Stem:
- Stem Is Aromatic:
- No
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Landscape:
- Landscape Location:
- Meadow
- Pond
- Riparian
- Landscape Theme:
- Rain Garden
- Resistance To Challenges:
- Wet Soil