Plant : Cotton Grass
Eriophorum angustifolium
Eriophorum angustifolium, or Cotton Grass, is a hardy marginal perennial with charming fluffy white flower tufts that float above grassy, rush-like foliage. Found naturally in acidic bogs and moorlands, this low-growing plant adds a soft, wild texture to pond edges or water gardens with its cotton-like blooms in spring.
Plant Care Essentials:
Light Requirements
Full sun
Water Scheduling
High
Growth Habit
Moderate to fast
Temperature
Very hardy
Plant Profile:
- Scientific Name:
- Eriophorum angustifolium
- Family:
- Cyperaceae
- Plant Type:
- Ornamental
- Origin:
- Europe, Asia, North America
- Size:
- 30–45cm
- Growth Rate:
- Moderate to fast
- Light Requirements:
- Full sun
- Watering Needs:
- High
- Temperature Tolerance:
- Very hardy
- Maintenance:
- Low
- Flower Color:
- White
- Flowering Season:
- Mid to late spring
- Drought Tolerant:
- No
- Tropical:
- No
- Indoor:
- No
- Has Fruits:
- Yes
- Edible Fruit:
- No
- Poisonous to Pets:
- No
Care Instructions:
Cotton Grass forms dense tufts of slender, green, sedge-like leaves and produces eye-catching white cottony seedheads in spring. Though the flowers themselves are small, the fluffy white bristles that follow create an ethereal look. Best suited for acidic, moisture-retentive soils, it grows well in shallow water and makes a graceful addition to wildlife gardens.
Light
Requires full sun for best flower display and compact growth. Partial shade is tolerated but may reduce the production of flower tufts. Ideal for open bog gardens or sunny pond edges.
Water
Needs consistently moist to waterlogged soil. Can grow in water up to 15 cm deep. Avoid drying out at any stage—damp, acidic environments are crucial to its success.
Soil
Prefers peat-rich, acidic soil that stays moist year-round. Will not thrive in alkaline or dry soils. Mimicking bog conditions encourages healthy growth and flowering.
Temperature
Exceptionally hardy; thrives in temperate and cold regions. Handles snow and frost with ease and comes back vigorously in spring.
Humidity
Naturally adapted to high humidity environments. Performs well in boggy, misty, or fog-prone areas where air and soil moisture are high.
Fertilizer
Rarely needed in nutrient-poor soils. Adding compost or peat when planting is beneficial, but avoid rich fertilization which may cause legginess.
Best Placement Ideas
- Natural pond or bog margins
- Acidic rain gardens
- Wildlife wetlands or native plant areas
- Paired with mosses and heathers for a natural look
Common Issues
- Spreading aggressively in favorable wet conditions
- Weak flowering in alkaline or dry soils
- Leaf yellowing if planted in full shade
- May outcompete delicate plants nearby
Things to Watch Out For
- Monitor spread in confined spaces
- Requires acidic soil—avoid lime-rich locations
- Remove spent tufts in fall for a tidy look
- Needs seasonal division to avoid overcrowding
Propagation Tips
Divide mature clumps in spring or autumn by lifting and cutting into sections with strong root and shoot growth. Replant divisions in moist, acidic soil immediately. Keep well-watered during establishment for best results.
Maintenance Tips
Low-maintenance overall. Cut back old foliage in autumn or early spring. Divide clumps every few years to control spread and rejuvenate growth. Ensure constant moisture and avoid fertilizing heavily to maintain natural form and flower density.
Did You Know?
Did you know cotton grass flowerheads were once used to stuff pillows and cushions? Their soft, silky appearance gives them a unique visual appeal that adds charm to naturalistic wetland gardens and boggy pond edges.
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