Woolgrass
scirpus cyperinus
Also known as: ["Woolgrass","Rice-root","Bulrush"]
Overview
A robust, grass-like perennial sedge with dense, woolly inflorescences and stiff, triangular stems.
Benefits & Perks
["disease resistant","deer resistant","wildlife attractant (bees, butterflies, birds)","drought tolerant","shade tolerant"]
Botanical Classification
| Phylum: | Magnoliophyta |
| Class: | Liliopsida |
| Order: | Poales |
| Family: | Cyperaceae |
| Genus: | Scirpus |
| Botanical Name: | Scirpus cyperinus |
Plant Characteristics
Basic Information
- Category: Shrubs
- Suitable Location: wetland edges, pond margins, or bog gardens
- Suitable For:
- Is Weed: No
- Allergenicity: low
Environmental Needs
- Climate: {"temperatureRange":"0–35°C"}
- Hardiness: {"zones":"4–9"}
- Misting: rarely required, only if ambient humidity is very low
- Drainage: Moderately well-draining; avoid waterlogged conditions.
- Soil Type: Rich, loamy soil with good organic matter; well-draining but moisture-retentive.
Maintenance Level
- Maintenance Level: low
- Toughness Level: high
- Pruning Frequency: Annually in late winter or early spring; light pruning can be done as needed throughout the growing season.
- Pruning Intensity: Moderate; remove up to one-third of the plant if overgrown, but avoid excessive cutting.
Care Details
Ideal Sunlight Coverage:
Full sun to partial shade (4–6 hours of direct sunlight daily); tolerates light shade in hotter climates.
Sunlight Tolerance Tips:
Acclimate gradually if moving from indoors to outdoors; protect from intense midday sun to avoid scorching; adjust placement based on seasonal light intensity.
Care Requirements
Care Difficulty
easymoderate
Sunlight
full sun to partial shade
Rotate plant for even growth; use sheer curtains to filter harsh sunlight; monitor for signs of sunburn.
Watering
every 7–10 days, allowing soil to dry slightly between waterings
Water thoroughly until it drains from the bottom; allow soil to dry slightly between waterings; avoid overhead watering to prevent fungal issues.
Soil
moist, fertile, loamy soil with good drainage
pH: Slightly acidic to neutral (pH 6.0–7.0).
Ensure soil is not compacted; avoid heavy clay soils; maintain consistent moisture levels.
Temperature
Prefers moderate temperatures (60–75°F or 15–24°C); can tolerate cooler conditions but avoid frost.
Protect from frost; avoid placing near drafty windows; maintain consistent temperatures for optimal growth.
Fertilizing
every 4–6 weeks during growing season with balanced liquid fertilizer
Fertilize in the morning for better absorption; flush soil occasionally to prevent salt buildup; reduce frequency in dormant periods.
Propagation
Methods
Division of rhizomes or stem cuttings.
Step-by-Step Propagation Guide
- Divide rhizomes carefully.
- Cut stems just below a node.
- Plant in prepared medium.
- Keep moist and warm.
Best Time: Early spring or late summer when the plant is actively growing.
Environment
Warm, humid conditions with indirect light; maintain consistent moisture.
Medium
Moist, well-draining soil mix (e.g., peat-based with perlite); can also be propagated in water initially.
Hormone
Optional, but can help with root development.
Timeline
Roots may develop in 2–4 weeks; new growth may appear in 6–8 weeks.
Tools Needed
Sharp, sterile knife; pruning shears; rooting hormone (optional); pots or containers.
Quick Tips
Use clean tools to prevent disease; keep cuttings out of direct sun; maintain humidity for faster rooting.
Pruning & Repotting
Pruning Guide
Method
Cut back dead stems to the base; trim back overgrown areas to encourage bushier growth.
Pruning Plan
Remove dead or damaged foliage to encourage new growth; shape the plant as needed to maintain form.
Tools
Pruning shears, sharp knife, gloves.
Checklist
Wear gloves; sterilize tools; cut dead or damaged stems; shape as desired; clean up debris.
Repotting Guide
Best Season
Early spring before new growth begins.
Pot Size
Choose a pot one size larger (1–2 inches wider in diameter) than the current one.
Method
Remove plant gently; trim any circling roots; place in a new pot with fresh soil; water thoroughly.
Suggestions
Repot every 2–3 years or when the plant becomes root-bound; beneficial for rejuvenation and growth.
Checklist
Select new pot; prepare fresh soil mix; trim roots if necessary; repot carefully; water and place in appropriate light.
Advanced Care Tips
Watering Mastery
Watering Checklist
Check soil moisture; water deeply; ensure drainage; adjust for season.
How to Apply Water Properly
Water directly at the root zone, ensuring even moisture distribution; water early in the morning to minimize evaporation; ensure excess water drains away to prevent waterlogging.
Watering Schedule Tips
Water deeply once the top inch of soil feels dry; reduce frequency in winter to prevent root rot.
Soil Improvement
Add compost or well-rotted manure to enhance fertility; mix in perlite or sand for better drainage.
Temperature Stress Management
Signs of Temperature Issues
Yellowing leaves (cold stress); wilting or browning leaf tips (heat stress); stunted growth.
Cold Stress
Slows growth; may cause leaf discoloration; can lead to root damage if temperatures drop below freezing.
Solution: Move to a sheltered location; provide a layer of mulch to insulate roots; avoid overwatering in cold conditions.
Hot Stress
Leaves may wilt or scorch; growth may slow; increased water demand to prevent dehydration.
Solution: Provide shade during peak heat; increase watering frequency; use mulch to retain soil moisture.
Fertilizing Guide
Fertilizing Checklist
Check fertilizer type; dilute correctly; apply during active growth; avoid winter feeding.
Fertilizing Method
Use a balanced, water-soluble fertilizer diluted to half strength; apply every 4–6 weeks during the growing season (spring to early fall); avoid fertilizing in winter.
Common Problems & Solutions
Toxicity Warning
Cats
Non-toxicScirpus cyperinus is not considered toxic to cats. It poses no known risk of toxicity when ingested or handled by felines.
⚡ Toxic If:
Generally non-toxic
Dogs
Non-toxicScirpus cyperinus is not considered toxic to dogs. There are no documented cases of adverse effects from ingestion or contact with this plant.
⚡ Toxic If:
Generally non-toxic
Humans
Non-toxicScirpus cyperinus, commonly known as woolgrass, is not considered toxic to humans. It has no known adverse physiological effects when handled or ingested in typical amounts.
⚡ Toxic If:
Generally non-toxic
Frequently Asked Questions
Q: Is Woolgrass suitable for wetland gardens?
A: Yes, Woolgrass thrives in moist to wet soils and is an excellent choice for wetland or bog gardens.
Q: Does Scirpus cyperinus require full sun?
A: It tolerates partial shade but performs best with at least partial sun exposure.
Q: Can Woolgrass be grown in containers?
A: While possible, it is best suited for garden beds due to its spreading habit and height.
Quick Reference
| Family: | Cyperaceae |
| Care: | easy |
| Light: | full sun to partial shade |
| Water: | every 7–10 days, allowing so |
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