German Hound's-tongue
cynoglossum germanicum
Also known as: ["Hound's-tongue","Blue Hound's-tongue"]
Overview
A perennial herbaceous plant with hairy leaves and blue flowers, native to Europe.
Benefits & Perks
["wildlife attractant (bees, butterflies, birds)","rare/collector’s item"]
Botanical Classification
| Phylum: | Magnoliophyta |
| Class: | Magnoliopsida |
| Order: | Boraginales |
| Family: | Boraginaceae |
| Genus: | Cynoglossum |
| Botanical Name: | Cynoglossum germanicum |
Plant Characteristics
Basic Information
- Category: Flowers
- Suitable Location: woodland garden or shaded rockery
- Suitable For:
- Is Weed: No
- Allergenicity: low
Environmental Needs
- Climate: {"temperatureRange":"5–25°C"}
- Hardiness: {"zones":"6–8"}
- Misting: every 2–3 days in dry conditions
- Drainage: Fast-draining to prevent waterlogging.
- Soil Type: Well-draining, loamy soil with added organic matter. A mix of potting soil, perlite, and compost works well.
Maintenance Level
- Maintenance Level: moderate
- Toughness Level: moderate
- Pruning Frequency: After flowering or every 6–8 weeks during active growth.
- Pruning Intensity: Light to moderate, focusing on removing dead or leggy stems.
Care Details
Ideal Sunlight Coverage:
Bright indirect light for 4–6 hours daily. Tolerates partial shade, especially in hot climates. Adjust exposure based on season to prevent scorching in summer.
Sunlight Tolerance Tips:
Acclimate plants gradually to increased light levels to prevent leaf burn. Place in dappled shade outdoors or near an east-facing window indoors. Avoid direct midday sun.
Care Requirements
Care Difficulty
moderatemoderate
Sunlight
partial shade
Rotate plant weekly for even growth; use sheer curtains to filter intense light; move to shadier spots during peak summer.
Watering
every 7–10 days during active growth, reduce in winter
Water deeply but infrequently to encourage deep root growth; ensure soil dries slightly between waterings; avoid waterlogging.
Soil
well-drained, humus-rich soil
pH: Slightly acidic to neutral (pH 6.0–7.0).
Use a pot with drainage holes; avoid heavy clay soils; test pH periodically.
Temperature
Prefers cool to moderate temperatures, ideally 60–70°F (15–21°C). Tolerates cooler spring and fall conditions but avoids extreme heat.
Avoid placing near drafty windows or heat vents; maintain consistent temperatures; monitor for signs of stress.
Fertilizing
every 4–6 weeks during spring and summer
Apply fertilizer to moist soil to prevent root burn; flush soil occasionally to prevent salt buildup; stop fertilizing before dormancy.
Propagation
Methods
Stem cuttings or division of clumps in spring. Seeds can be sown, but germination may be slow and erratic.
Step-by-Step Propagation Guide
- Take 4–6 inch cuttings.
- Remove lower leaves.
- Dip in rooting hormone (optional).
- Plant in medium.
- Keep moist and warm.
Best Time: Spring, when the plant is actively growing and temperatures are mild.
Environment
Warm, humid environment with indirect light. Maintain consistent moisture without waterlogging.
Medium
Well-draining potting mix with perlite or sand for cuttings; seedlings prefer a light, airy mix.
Hormone
Rooting hormone is optional but can improve success rates for stem cuttings.
Timeline
Stem cuttings may root in 3–6 weeks; seed germination can take several weeks to months.
Tools Needed
Pruning shears, rooting hormone, small pots, well-draining medium, misting spray bottle.
Quick Tips
Use sterile tools to prevent disease; maintain high humidity with a propagation dome; avoid direct sunlight.
Pruning & Repotting
Pruning Guide
Method
Pinch back tips or snip stems just above a leaf node to encourage branching.
Pruning Plan
Light pruning to maintain shape and encourage bushier growth. Remove spent flowers to promote reblooming.
Tools
Clean, sharp pruning shears or scissors.
Checklist
Sterilize tools; prune after flowering; remove dead/damaged growth; shape as needed.
Repotting Guide
Best Season
Early spring before new growth begins.
Pot Size
One size up from current pot (e.g., +2 inches in diameter).
Method
Gently remove plant; trim any circling roots; place in a slightly larger pot with fresh, well-draining soil; water lightly.
Suggestions
Repot every 2–3 years or when roots fill the container. Cynoglossum germanicum prefers slightly root-bound conditions.
Checklist
Choose appropriate pot size; use fresh soil mix; handle roots carefully; water after repotting.
Advanced Care Tips
Watering Mastery
Watering Checklist
Check soil moisture before watering; water deeply; ensure drainage; avoid overhead watering.
How to Apply Water Properly
Water at the base of the plant, ensuring moisture reaches the root zone without wetting foliage. Water early in the day to minimize evaporation and fungal issues. Allow excess water to drain freely from the pot or soil.
Watering Schedule Tips
Water moderately during active growth in spring and early summer, reducing frequency in fall and winter to allow for dormancy. Adjust based on rainfall and humidity levels.
Soil Improvement
Add perlite or coarse sand for drainage; incorporate compost for fertility; ensure soil is loose and airy.
Temperature Stress Management
Signs of Temperature Issues
Chlorosis or wilting in excessive heat; stunted growth or bud drop in cold stress.
Cold Stress
Low temperatures slow metabolic processes, leading to reduced growth and potential frost damage if below 50°F (10°C).
Solution: Protect from frost with a frost cloth or move indoors. Ensure good air circulation to prevent mold in cool, damp conditions.
Hot Stress
Excessive heat causes leaf scorch, wilting, and reduced flowering due to water stress and metabolic disruption.
Solution: Provide shade during peak heat, increase humidity, and water more frequently without overwatering.
Fertilizing Guide
Fertilizing Checklist
Use diluted fertilizer; apply during active growth; avoid dormant periods; flush soil periodically.
Fertilizing Method
Use a balanced, water-soluble fertilizer diluted to half strength every 4–6 weeks during spring and summer. Avoid fertilizing in fall and winter.
Common Problems & Solutions
Toxicity Warning
Cats
Slightly ToxicCats are sensitive to the alkaloids in Cynoglossum germanicum, which can lead to mild gastrointestinal issues if ingested. While not highly toxic, ingestion should be avoided to prevent discomfort.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Dogs
Slightly ToxicDogs may experience mild gastrointestinal upset if they ingest parts of Cynoglossum germanicum. The alkaloids present can cause discomfort but are not typically life-threatening unless consumed in large amounts.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Humans
Slightly ToxicCynoglossum germanicum contains alkaloids that can cause mild gastrointestinal distress and skin irritation upon contact. The roots and leaves are the most toxic parts, though the effects are generally not severe unless consumed in large quantities.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Frequently Asked Questions
Q: Is Cynoglossum germanicum toxic to pets?
A: It is mildly toxic to dogs and cats.
Q: What are the common problems with this plant?
A: Common issues include yellow leaves and wilting.
Q: Is this plant suitable for beginners?
A: It requires moderate care, making it more suitable for enthusiasts than beginners.
Quick Reference
| Family: | Boraginaceae |
| Care: | moderate |
| Light: | partial shade |
| Water: | every 7–10 days during activ |
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