Climbing oleander
strophanthus gratus
Also known as: ["Crown flower","Climbing oleander","Crown vine"]
Overview
A vigorous, woody vine with showy, bell-shaped flowers and distinctive seed pods that spiral as they dry.
Benefits & Perks
["long-flowering","aesthetic foliage","wildlife attractant (bees, butterflies, birds)"]
Botanical Classification
| Phylum: | Magnoliophyta |
| Class: | Magnoliopsida |
| Order: | Gentianales |
| Family: | Apocynaceae |
| Genus: | Strophanthus |
| Botanical Name: | Strophanthus gratus |
Plant Characteristics
Basic Information
- Category: Flowers
- Suitable Location: indoor pot or sheltered outdoor location
- Suitable For:
- Is Weed: No
- Allergenicity: low
Environmental Needs
- Climate: {"temperatureRange":"15–30°C"}
- Hardiness: {"zones":"9–11"}
- Misting: every 2–3 days in dry climates, rarely required in humid environments
- Drainage: Fast-draining to prevent waterlogging.
- Soil Type: Well-draining potting mix with added perlite or sand for aeration.
Maintenance Level
- Maintenance Level: moderate
- Toughness Level: moderate
- Pruning Frequency: Annually in late winter or early spring before new growth begins.
- Pruning Intensity: Moderate; remove up to one-third of the oldest stems to rejuvenate the plant.
Care Details
Ideal Sunlight Coverage:
Bright indirect light for 6–8 hours daily; can tolerate some direct morning sun but avoid harsh afternoon sun.
Sunlight Tolerance Tips:
Acclimate gradually to direct light; protect from intense sun to prevent scorching; adjust placement based on indoor/outdoor conditions.
Care Requirements
Care Difficulty
moderatemoderate
Sunlight
partial shade to full sun
Rotate plant for even growth; use sheer curtains to filter strong light; move outdoors in warm months for better light exposure.
Watering
every 7–10 days during active growth, reduce in winter
Water deeply but infrequently; ensure soil dries between waterings; avoid overwatering.
Soil
well-draining, fertile potting mix
pH: Slightly acidic to neutral (pH 6.0–7.0).
Ensure pots have drainage holes; avoid heavy clay soils; top-dress with compost annually.
Temperature
Prefers 65–85°F (18–29°C); tolerates mild fluctuations but avoid prolonged exposure to extreme temperatures.
Avoid placing near drafty windows; use a humidifier in dry environments; monitor temperature changes.
Fertilizing
every 2 weeks during growing season, monthly in spring and fall
Fertilize only when actively growing; flush soil occasionally to prevent salt buildup; use a balanced formula.
Propagation
Methods
Stem cuttings are the most reliable method.
Step-by-Step Propagation Guide
- Take a healthy cutting.
- Apply rooting hormone.
- Plant in medium.
- Maintain humidity.
- Wait for roots.
Best Time: Spring or early summer when the plant is actively growing.
Environment
High humidity (70–80%), warm temperatures (75–85°F), and indirect light.
Medium
Well-draining mix of peat and perlite or cactus mix.
Hormone
Rooting hormone is recommended to improve success rates.
Timeline
Roots may develop in 4–8 weeks; new growth typically appears after 2–3 months.
Tools Needed
Pruning shears, rooting hormone, small pots, plastic wrap or propagator.
Quick Tips
Use healthy, non-flowering stems; keep consistently moist but not waterlogged; provide bottom heat if possible.
Pruning & Repotting
Pruning Guide
Method
Selective pruning of long or leggy stems; pinch back tips to encourage branching.
Pruning Plan
Prune to maintain shape, encourage bushier growth, and remove dead or overgrown stems.
Tools
Clean, sharp pruning shears or scissors.
Checklist
Disinfect tools; prune during dormancy; remove dead/damaged growth; shape as desired.
Repotting Guide
Best Season
Spring, before the active growing season begins.
Pot Size
Increase pot size by 2–3 inches in diameter.
Method
Remove plant gently; trim roots if necessary; place in a slightly larger pot with fresh soil; water lightly.
Suggestions
Repot every 2–3 years or when roots fill the pot; necessary to refresh soil and provide space for growth.
Checklist
Check root bound status; prepare new pot with drainage; use fresh soil mix; 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 at the base of the plant, ensuring moisture reaches the root zone; allow excess water to drain away; water in the morning to reduce evaporation.
Watering Schedule Tips
Water thoroughly when the top inch of soil is dry; reduce frequency in winter to prevent root rot.
Soil Improvement
Add perlite or coarse sand to improve drainage; incorporate organic matter like compost for fertility.
Temperature Stress Management
Signs of Temperature Issues
Wilting, leaf drop, or stunted growth in cold; scorching or leaf burn in excessive heat.
Cold Stress
Slows growth, may cause leaf drop, and increases susceptibility to root rot.
Solution: Move to a warmer location; protect from drafts; reduce watering in cold conditions.
Hot Stress
Leaves may scorch, growth may slow, and water demand increases.
Solution: Provide shade during peak heat; increase humidity; water more frequently but avoid waterlogging.
Fertilizing Guide
Fertilizing Checklist
Check growth phase; dilute fertilizer; apply to moist soil; stop in winter.
Fertilizing Method
Use a balanced liquid fertilizer diluted to half strength every 4–6 weeks during growing season (spring to early fall); avoid fertilizing in winter.
Common Problems & Solutions
Toxicity Warning
Cats
ToxicCats are highly sensitive to the cardiac glycosides in Strophanthus gratus, which can cause severe cardiovascular and gastrointestinal toxicity, potentially leading to fatal outcomes.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Dogs
ToxicThe cardiac glycosides in Strophanthus gratus are highly toxic to dogs, affecting their cardiovascular system and potentially leading to life-threatening arrhythmias and electrolyte imbalances.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Humans
ToxicStrophanthus gratus contains cardiac glycosides, which can significantly affect heart function and electrolyte balance. Ingestion can lead to severe cardiovascular and gastrointestinal disturbances.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Frequently Asked Questions
Q: Is Strophanthus gratus safe for pets?
A: No, it is highly toxic to dogs and cats.
Q: How does Strophanthus gratus grow?
A: It is a vigorous climber that requires support and thrives in warm, humid conditions.
Q: What are the distinctive features of Strophanthus gratus?
A: It has bell-shaped flowers and spiral seed pods.
Quick Reference
| Family: | Apocynaceae |
| Care: | moderate |
| Light: | partial shade to full sun |
| Water: | every 7–10 days during activ |
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