Swamp Mahogany
eucalyptus robusta
Also known as: ["Swamp Gum","Red Mahogany"]
Overview
A large evergreen tree native to Australia, known for its aromatic leaves and reddish-brown bark.
Benefits & Perks
["fast growing","fragrant flowers","wildlife attractant (bees, butterflies, birds)","shade tolerant"]
Botanical Classification
| Phylum: | Magnoliophyta |
| Class: | Magnoliopsida |
| Order: | Myrtales |
| Family: | Myrtaceae |
| Genus: | Eucalyptus |
| Botanical Name: | Eucalyptus robusta |
Plant Characteristics
Basic Information
- Category: Trees
- Suitable Location: outdoor garden in temperate to subtropical regions
- Suitable For:
- Is Weed: No
- Allergenicity: low
Environmental Needs
- Climate: {"temperatureRange":"5–35°C"}
- Hardiness: {"zones":"9–11"}
- Misting: rarely required, only if ambient humidity is very low
- Drainage: Fast-draining to prevent root rot.
- Soil Type: Well-draining, slightly acidic soil with organic matter; cactus or succulent mix is ideal.
Maintenance Level
- Maintenance Level: moderate
- Toughness Level: high
- Pruning Frequency: Annually in late winter or early spring; light pruning can be done as needed.
- Pruning Intensity: Moderate; remove up to one-third of growth if necessary to rejuvenate.
Care Details
Ideal Sunlight Coverage:
Full sun (6–8 hours of direct sunlight daily); tolerates partial shade but may become leggy.
Sunlight Tolerance Tips:
Acclimate gradually if moving from shade to sun; protect from intense midday sun in hot climates; ensure good air circulation to prevent fungal issues.
Care Requirements
Care Difficulty
moderatemoderate
Sunlight
full sun to partial shade
Rotate plant for even growth; use sheer curtains to filter harsh sun; avoid placing near reflective surfaces that intensify light.
Watering
every 7–10 days during active growth, reduce in winter
Water thoroughly until it drains from the bottom; allow soil to dry between waterings; avoid overwatering.
Soil
well-draining, loamy soil with organic matter
pH: Slightly acidic (pH 5.5–6.5).
Use a pot with drainage holes; avoid heavy clay soils; top-dress with compost annually.
Temperature
Prefers warm temperatures (65–85°F or 18–29°C); tolerates brief dips to 20°F (-6°C) but thrives in heat.
Avoid sudden temperature changes; protect from drafts; maintain consistent warmth during active growth.
Fertilizing
every 2–3 months during growing season with balanced fertilizer
Avoid fertilizing in winter; apply fertilizer to moist soil to prevent root burn; flush soil occasionally to prevent salt buildup.
Propagation
Methods
Stem cuttings taken from new growth.
Step-by-Step Propagation Guide
- Take a 4–6 inch cutting.
- Remove lower leaves.
- Dip in rooting hormone.
- Plant in medium.
- Maintain humidity.
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); indirect light.
Medium
Well-draining mix of perlite and peat moss or cactus mix.
Hormone
Rooting hormone is recommended to improve success rates.
Timeline
Roots may develop in 4–8 weeks; establish in new pot after 3–6 months.
Tools Needed
Pruning shears, rooting hormone, small pots, humidity dome or plastic bag.
Quick Tips
Use sharp, sterile tools; keep soil consistently moist but not waterlogged; provide bottom heat if possible.
Pruning & Repotting
Pruning Guide
Method
Use clean cuts just above a leaf node or branch junction; avoid leaving stubs.
Pruning Plan
Prune to maintain shape, encourage bushiness, and remove dead or diseased growth.
Tools
Pruning shears, loppers (for larger branches), sterilizing solution.
Checklist
Sterilize tools; prune during dormancy; remove dead/diseased wood; shape as desired.
Repotting Guide
Best Season
Early spring before new growth begins.
Pot Size
Choose a pot 1–2 inches larger in diameter than the current one.
Method
Remove plant gently; trim roots if crowded; place in new pot with fresh soil; water lightly.
Suggestions
Repot every 2–3 years or when roots fill the pot; beneficial for young, rapidly growing plants.
Checklist
Prepare new pot with drainage holes; use fresh, well-draining soil; handle roots carefully; water after repotting.
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 day 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 perlite or coarse sand for drainage; incorporate compost for fertility; ensure good aeration.
Temperature Stress Management
Signs of Temperature Issues
Chlorosis or leaf drop in cold stress; wilting or scorching in excessive heat.
Cold Stress
Growth slows; leaves may turn yellow or drop; increased susceptibility to pests and diseases.
Solution: Move to a sheltered location; provide frost protection; reduce watering in cold periods.
Hot Stress
Leaves may scorch, wilt, or drop; growth may slow; increased water demand.
Solution: Provide shade during peak heat; increase watering frequency; ensure good air circulation.
Fertilizing Guide
Fertilizing Checklist
Check fertilizer type; follow dilution instructions; apply during growing season; avoid overfertilization.
Fertilizing Method
Use a balanced, slow-release fertilizer in spring and summer; dilute liquid fertilizer to half-strength if used monthly.
Common Problems & Solutions
Toxicity Warning
Cats
ToxicCats are highly sensitive to the toxic compounds in Eucalyptus robusta. Ingestion can result in severe toxicity, affecting the gastrointestinal and nervous systems, and potentially leading to serious health complications.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Dogs
ToxicIngestion of Eucalyptus robusta by dogs can lead to toxicity due to the presence of terpenes and other toxic compounds. These substances can cause severe gastrointestinal upset and neurological symptoms in canines.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Humans
ToxicEucalyptus robusta contains toxic compounds, primarily terpenes and flavonoids, which can cause significant physiological distress when ingested. These compounds interfere with the nervous system and can lead to severe gastrointestinal and respiratory issues.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Frequently Asked Questions
Q: Is Eucalyptus robusta suitable for small gardens?
A: No, it is a large tree and requires ample space.
Q: Does it require full sun?
A: Yes, it thrives in full sun but can tolerate partial shade.
Q: Is the wood of Eucalyptus robusta durable?
A: Yes, it is known for its durability and is often used in construction.
Quick Reference
| Family: | Myrtaceae |
| Care: | moderate |
| Light: | full sun to partial shade |
| Water: | every 7–10 days during activ |
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