Marsh Parsley
thysselinum palustre
Also known as: ["Marsh Cow Parsley","Fen Parsley"]
Overview
A herbaceous biennial plant native to wetland habitats, resembling common parsley but with a more delicate appearance.
Benefits & Perks
["wildlife attractant (bees, butterflies, birds)","shade tolerant"]
Botanical Classification
| Phylum: | Magnoliophyta |
| Class: | Magnoliopsida |
| Order: | Apiales |
| Family: | Apiaceae |
| Genus: | Thysselinum |
| Botanical Name: | Thysselinum palustre |
Plant Characteristics
Basic Information
- Category: Herbs & Weeds
- Suitable Location: moist garden beds or containers in shaded areas
- Suitable For:
- Is Weed: No
- Allergenicity: low
Environmental Needs
- Climate: {"temperatureRange":"0–30°C"}
- Hardiness: {"zones":"4–9"}
- Misting: rarely required, only if ambient humidity is very low
- Drainage: Moderately well-draining; avoid waterlogging but maintain moisture.
- Soil Type: Moist, well-draining soil with organic matter; peat-based mix with perlite or sand.
Maintenance Level
- Maintenance Level: moderate
- Toughness Level: moderate
- Pruning Frequency: As needed, typically in spring or after flowering.
- Pruning Intensity: Light to moderate; avoid heavy pruning unless necessary.
Care Details
Ideal Sunlight Coverage:
Partial shade to full sun (4–6 hours of direct sunlight or bright indirect light); adjust based on intensity and season.
Sunlight Tolerance Tips:
Acclimate gradually to direct sun to prevent scorching; provide dappled light in hot climates; protect from harsh afternoon sun.
Care Requirements
Care Difficulty
moderatemoderate
Sunlight
partial shade to full shade
Morning sun is ideal; use shade cloth if needed; rotate plant for even light exposure.
Watering
every 7–10 days, allowing soil to dry slightly between waterings
Water thoroughly until it drains from the bottom, avoid waterlogging, and ensure consistent moisture during growth periods.
Soil
moist, rich, organic soil with good drainage
pH: Slightly acidic to neutral (pH 6.0–7.0).
Use a mix that retains moisture but drains well; avoid heavy clay soils; topdress with compost annually.
Temperature
Prefers cool to moderate temperatures (60–75°F or 15–24°C); tolerates cooler nights during dormancy.
Avoid sudden temperature changes; protect from heatwaves; maintain consistent cool nights.
Fertilizing
every 4–6 weeks during active growth (spring and summer)
Fertilize in spring/summer only; flush soil occasionally to prevent buildup; use organic options for gentle feeding.
Propagation
Methods
Stem cuttings or division; stem cuttings are more common for home growers.
Step-by-Step Propagation Guide
- Take a healthy cutting, remove lower leaves, dip in hormone (optional), plant in medium, maintain humidity, and wait for roots.
Best Time: Spring or early summer when the plant is actively growing.
Environment
High humidity (70–90%), warm temperatures (70–75°F or 21–24°C), and indirect light.
Medium
Well-draining mix of peat, perlite, and sand; or use a cactus/succulent mix.
Hormone
Optional but recommended for faster rooting.
Timeline
Roots develop in 2–4 weeks; new growth appears in 6–8 weeks.
Tools Needed
Pruners, rooting hormone, propagation tray, humidity dome, well-draining medium.
Quick Tips
Use sterile tools; keep soil consistently moist; provide bottom heat for faster rooting.
Pruning & Repotting
Pruning Guide
Method
Pinch back tips or cut stems just above a leaf node to promote branching.
Pruning Plan
Remove dead or damaged stems to encourage bushier growth and improve air circulation.
Tools
Clean, sharp pruners or scissors.
Checklist
Sanitize tools, prune dead/damaged parts, shape as desired, clean up debris.
Repotting Guide
Best Season
Spring, before active growth begins.
Pot Size
One size larger pot (e.g., +2 inches in diameter).
Method
Remove plant gently, trim roots if needed, place in a slightly larger pot with fresh soil, water lightly.
Suggestions
Repot every 2–3 years or when roots fill the pot; beneficial for growth and soil refresh.
Checklist
Check root bound status, prepare new pot, trim roots, use fresh soil, water lightly.
Advanced Care Tips
Watering Mastery
Watering Checklist
Check soil moisture, water thoroughly, ensure drainage, adjust for season.
How to Apply Water Properly
Water directly at the root zone, apply until water drains freely, ensure even moisture distribution, and water in the morning to reduce evaporation.
Watering Schedule Tips
Water regularly during active growth, allowing soil to dry slightly between waterings; reduce frequency in winter dormancy.
Soil Improvement
Add perlite or sand for drainage; incorporate compost for fertility; ensure aeration with organic matter.
Temperature Stress Management
Signs of Temperature Issues
Wilting, yellowing leaves, stunted growth, or premature flowering due to stress.
Cold Stress
Slows growth, may cause leaf drop or browning; susceptible to frost damage below 32°F (0°C).
Solution: Protect from frost, move to a sheltered location, and avoid cold drafts; use frost cloth if outdoors.
Hot Stress
Leaves may scorch, wilt, or drop; growth may cease in excessive heat above 85°F (29°C).
Solution: Provide shade, increase humidity, water more frequently, and ensure good air circulation.
Fertilizing Guide
Fertilizing Checklist
Check growth phase, dilute correctly, apply to moist soil, stop in dormancy.
Fertilizing Method
Use balanced liquid fertilizer diluted to half strength every 4–6 weeks during active growth; avoid fertilizing in winter.
Common Problems & Solutions
Toxicity Warning
Cats
Slightly ToxicCats may suffer mild gastrointestinal issues if they consume the roots or bulbs of Thysselinum palustre. The toxic compounds are not highly potent but can cause discomfort.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Dogs
Slightly ToxicDogs may experience mild gastrointestinal upset if they ingest the roots or bulbs of Thysselinum palustre. The plant contains irritants that can cause discomfort but are not typically life-threatening.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Humans
Slightly ToxicThysselinum palustre contains toxic compounds that can cause mild gastrointestinal distress and skin irritation upon contact. The roots and bulbs are the most toxic parts, containing irritant substances that affect the digestive system.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Frequently Asked Questions
Q: Is Marsh Parsley edible?
A: It is not recommended for consumption due to potential confusion with toxic look-alikes.
Q: Where does Marsh Parsley grow best?
A: It thrives in moist, shaded environments such as marshes and wet meadows.
Q: Does Marsh Parsley attract wildlife?
A: Yes, it is known to attract bees, butterflies, and other pollinators.
Quick Reference
| Family: | Apiaceae |
| Care: | moderate |
| Light: | partial shade to full shade |
| Water: | every 7–10 days, allowing so |
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