Common Willowherb
epilobium collinum
Also known as: ["Collared Willowherb","Hill Willowherb"]
Overview
A herbaceous perennial plant native to Europe and Asia, known for its pinkish-purple flowers and slender stems.
Benefits & Perks
["wildlife attractant (bees, butterflies, birds)","low maintenance","aesthetic foliage"]
Botanical Classification
| Phylum: | Magnoliophyta |
| Class: | Magnoliopsida |
| Order: | Myrtales |
| Family: | Onagraceae |
| Genus: | Epilobium |
| Botanical Name: | Epilobium collinum |
Plant Characteristics
Basic Information
- Category: Herbs & Weeds
- Suitable Location: border plantings or rock gardens in temperate regions
- Suitable For:
- Is Weed: No
- Allergenicity: low
Environmental Needs
- Climate: {"temperatureRange":"0–30°C"}
- Hardiness: {"zones":"4–8"}
- Misting: rarely required, only if ambient humidity is very low
- Drainage: Fast-draining to prevent waterlogging.
- Soil Type: Well-draining, loamy soil with organic matter; avoid heavy clay.
Maintenance Level
- Maintenance Level: low
- Toughness Level: moderate
- Pruning Frequency: Annually in late winter or early spring; light pruning can be done after flowering.
- Pruning Intensity: Moderate; remove up to one-third of the plant if overgrown.
Care Details
Ideal Sunlight Coverage:
Full sun to partial shade; 6–8 hours of direct sunlight per day, with some afternoon shade in hot climates.
Sunlight Tolerance Tips:
Acclimate plants gradually to intense sunlight; protect from harsh midday sun; adjust placement based on seasonal light changes.
Care Requirements
Care Difficulty
easymoderate
Sunlight
full sun to partial shade
Rotate plant for even light exposure; use shade cloth in extreme heat; monitor for sunburn.
Watering
every 7–10 days during active growth, less frequently in winter
Water thoroughly but infrequently; ensure soil dries between waterings; avoid overwatering.
Soil
well-draining, sandy loam with moderate organic content
pH: Slightly acidic to neutral, pH 6.0–7.0.
Use a mix of garden soil, peat, and perlite; avoid compacted soil; ensure good drainage.
Temperature
Prefers cool to moderate temperatures, 60–75°F (15–24°C); tolerates cooler nights.
Protect from frost; avoid sudden temperature swings; maintain moderate humidity.
Fertilizing
every 4–6 weeks during spring and summer, none in autumn and winter
Apply fertilizer to moist soil to prevent root burn; flush soil occasionally to prevent salt buildup; reduce feeding in dormancy.
Propagation
Methods
Stem cuttings or division; stem cuttings are more common for home growers.
Step-by-Step Propagation Guide
- Take a 4–6 inch cutting.
- Remove lower leaves.
- Dip in rooting hormone (optional).
- Plant in moist medium.
- Keep warm and humid.
Best Time: Spring or early summer when the plant is actively growing.
Environment
Warm, humid environment with indirect light; maintain consistent moisture.
Medium
Well-draining potting mix, such as a mix of peat, perlite, and sand.
Hormone
Rooting hormone is optional but can improve success rates.
Timeline
Roots typically form in 3–6 weeks; new growth may appear in 2–3 months.
Tools Needed
Pruning shears, rooting hormone, small pots, misting spray bottle.
Quick Tips
Use healthy, non-flowering stems; maintain high humidity; avoid direct sunlight.
Pruning & Repotting
Pruning Guide
Method
Cut back stems to just above a leaf node or bud; remove dead or crossing branches.
Pruning Plan
Prune to maintain shape, encourage bushier growth, and remove dead or diseased stems.
Tools
Pruning shears, sterilizing solution, gloves.
Checklist
Sterilize tools; prune during dormancy; remove dead or diseased growth.
Repotting Guide
Best Season
Early spring before active growth begins.
Pot Size
Choose a pot 1–2 inches larger in diameter than the current one.
Method
Use fresh, well-draining soil; gently tease out root ball; trim any dead roots; place in a pot with drainage holes.
Suggestions
Repot every 2–3 years or when roots fill the pot; beneficial for growth and health.
Checklist
Prepare new pot with drainage; gently remove plant; trim roots if needed; use fresh soil.
Advanced Care Tips
Watering Mastery
Watering Checklist
Check soil moisture; water deeply; ensure drainage; adjust for season.
How to Apply Water Properly
Water at the base of the plant, ensuring even moisture reaches the root zone; allow excess water to drain away; water in the morning to reduce evaporation.
Watering Schedule Tips
Water deeply when the top 1–2 inches of soil are dry; reduce frequency in winter to prevent root rot.
Soil Improvement
Add perlite or sand for drainage; incorporate compost for fertility; ensure good aeration.
Temperature Stress Management
Signs of Temperature Issues
Wilting, leaf drop, or stunted growth in extreme heat; browning leaf edges in cold stress.
Cold Stress
Slows growth and can cause leaf damage or dieback in prolonged cold or frost.
Solution: Provide frost protection in winter; avoid placing in drafty areas; mulch to insulate roots.
Hot Stress
Leaves may scorch, wilt, or drop in excessive heat; growth may slow.
Solution: Provide shade during peak heat; increase watering; improve air circulation.
Fertilizing Guide
Fertilizing Checklist
Use diluted fertilizer; apply during active growth; avoid winter feeding.
Fertilizing Method
Use a balanced, water-soluble fertilizer diluted to half strength; fertilize every 4–6 weeks during growing season (spring to early fall); avoid winter fertilization.
Common Problems & Solutions
Toxicity Warning
Cats
Non-toxicEpilobium collinum is not known to be toxic to cats. It is generally safe for feline ingestion in small amounts.
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Dogs
Non-toxicEpilobium collinum is not known to be toxic to dogs. It does not pose a significant risk if ingested in small quantities.
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Humans
Non-toxicEpilobium collinum is not known to have toxic effects on humans. It is generally considered safe for consumption in moderate amounts.
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Frequently Asked Questions
Q: Is Epilobium collinum toxic to pets?
A: No, it is non-toxic to dogs and cats.
Q: How often should I water Epilobium collinum?
A: Water moderately, allowing the soil to dry slightly between waterings.
Q: Does Epilobium collinum attract wildlife?
A: Yes, it attracts bees, butterflies, and birds with its flowers.
Quick Reference
| Family: | Onagraceae |
| Care: | easy |
| Light: | full sun to partial shade |
| Water: | every 7–10 days during activ |
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