Golden Trumpet Vine

allamanda cathartica

Also known as: ["Golden Trumpet","Trumpet Vine"]

Family: Apocynaceae Genus: Allamanda Category: Flowers

Overview

A vigorous, evergreen vine known for its large, bright yellow, trumpet-shaped flowers and glossy green leaves.

Benefits & Perks

["long-flowering","fragrant flowers","wildlife attractant (bees, butterflies, birds)"]

Botanical Classification

Phylum: Magnoliophyta
Class: Magnoliopsida
Order: Gentianales
Family: Apocynaceae
Genus: Allamanda
Botanical Name: Allamanda cathartica

Plant Characteristics

Basic Information
  • Category: Flowers
  • Suitable Location: outdoor garden bed in warm climates, or large indoor pot in bright, sunny location
  • Suitable For:
    Collectors & Enthusiasts Outdoor Landscapers Fragrance Lovers Wildlife Supporters
  • Is Weed: No
  • Allergenicity: low
Environmental Needs
  • Climate: {"temperatureRange":"18–35°C, intolerant of frost"}
  • Hardiness: {"zones":"9b–11"}
  • Misting: rarely required, only if ambient humidity drops below 40%
  • Drainage: Fast-draining to prevent root rot.
  • Soil Type: Well-draining potting mix with added perlite or sand.
Maintenance Level
  • Maintenance Level: moderate
  • Toughness Level: moderate
  • Pruning Frequency: Annually in late winter or early spring; light pruning can be done as needed.
  • Pruning Intensity: Moderate to heavy, depending on desired shape and size.
Care Details

Ideal Sunlight Coverage:
Bright, direct sunlight for 6–8 hours daily; adjust for intense summer sun by providing partial shade.

Sunlight Tolerance Tips:
Acclimate plants gradually to direct sun; protect from harsh midday sun; place indoors near a south-facing window if outdoors is not feasible.

Warning Signs: Yellowing leaves, root rot, or stunted growth indicate poor soil or drainage issues.

Care Requirements

Care Difficulty
moderate

moderate

Sunlight

full sun to partial shade

Rotate plant weekly for even growth; use sheer curtains to filter intense light; avoid shaded areas.

Watering

every 7–10 days during active growth, reducing to every 14–21 days in winter

Water deeply to encourage root growth; allow soil to dry between waterings; avoid overwatering.

Soil

well-draining, loamy soil with added organic matter

pH: Slightly acidic to neutral (pH 6.0–7.0).

Ensure pots have drainage holes; avoid heavy clay soils; test pH periodically.

Temperature

Prefers warm temperatures between 65–85°F (18–29°C); thrives in tropical conditions.

Protect from drafts; maintain consistent warmth; avoid sudden temperature fluctuations.

Fertilizing

every 2–4 weeks during growing season (spring and summer) with balanced liquid fertilizer, none in winter

Dilute fertilizer to half strength; fertilize after watering to prevent root burn; avoid fertilizing dry soil.

Propagation

Methods

Stem cuttings in water or soil.

Step-by-Step Propagation Guide
  1. Take a 4–6 inch cutting.
  2. Remove lower leaves.
  3. Place in medium.
  4. Maintain moisture and warmth.

Best Time: Spring or early summer when the plant is actively growing.

Environment

Warm, humid environment with indirect light.

Medium

Well-draining soil mix or water with occasional root hormone application.

Hormone

Optional but recommended for faster rooting.

Timeline

Roots develop in 2–4 weeks; new growth appears in 6–8 weeks.

Tools Needed

Pruning shears, rooting hormone, small pots, plastic wrap.

Quick Tips

Use healthy, non-flowering stems; keep soil consistently moist; provide bottom heat for faster rooting.

Pruning & Repotting

Pruning Guide
Method

Cut stems just above a leaf node or bud; remove crossing or crowded branches.

Pruning Plan

Prune to maintain shape, encourage bushier growth, and remove dead or overgrown stems.

Tools

Pruning shears, sterilizing solution, gloves.

Checklist

Sterilize tools; prune during dormancy; remove dead/diseased wood; shape the plant.

Repotting Guide
Best Season

Spring, before the active growing season begins.

Pot Size

One size larger pot; ensure good drainage holes.

Method

Remove plant gently; trim roots if needed; place in new 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.

Checklist

Choose appropriate pot; prepare new 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 at the base of the plant, ensuring moisture reaches the root zone; water early in the day to minimize evaporation; ensure excess water drains away.

Pro Tip: Use a watering can with a narrow spout to direct water to the root zone without wetting foliage.
Watering Schedule Tips

Water thoroughly when 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 organic matter for fertility.

Temperature Stress Management
Signs of Temperature Issues

Yellowing leaves, wilting, or bud drop in cold; leaf scorch or stunted growth in excessive heat.

Cold Stress

Growth slows or halts; leaves may drop; risk of frost damage below 50°F (10°C).

Solution: Move to a warmer location; provide a heat source if indoors; cover outdoors if frost is expected.

Hot Stress

Wilting, leaf scorch, or reduced flowering due to excessive heat and dryness.

Solution: Provide shade during peak sun; increase humidity; water more frequently but avoid waterlogging.

Fertilizing Guide
Fertilizing Checklist

Check fertilizer type; dilute correctly; apply during active growth; avoid winter.

Fertilizing Method

Use a balanced liquid fertilizer every 2–4 weeks during growing season (spring/summer); reduce or stop in fall/winter.

Common Problems & Solutions

Yellowing leaves in Allamanda cathartica may indicate nutrient deficiencies, overwatering, or pest infestations, affecting photosynthesis and overall plant health.

Wilting in Allamanda cathartica can result from water stress, either due to under or overwatering, or root damage, leading to reduced turgor pressure and impaired nutrient uptake.

Leaf spots on Allamanda cathartica may be caused by fungal or bacterial pathogens, leading to reduced photosynthetic efficiency and potential defoliation if severe.

Rotting, particularly root or stem rot, can occur in Allamanda cathartica due to excessive moisture or fungal infections, causing decay and potentially plant death.

Toxicity Warning

Cats
Toxic

Cats are susceptible to the toxic effects of Allamanda cathartica, particularly due to the plant's alkaloids and saponins. Ingestion can result in gastrointestinal and systemic toxicity.

⚠️ Symptoms:
vomiting diarrhea lethargy depression loss of appetite
🌿 Toxic Parts:
leaves flowers seeds
⚡ Toxic If:

if eaten

Keep plants out of reach of cats. If ingestion is suspected, seek veterinary care promptly.
Dogs
Toxic

In dogs, ingestion of Allamanda cathartica can lead to gastrointestinal upset and other toxic effects due to the presence of alkaloids and saponins. The plant is not typically appealing to dogs but can cause harm if consumed.

⚠️ Symptoms:
vomiting diarrhea lethargy loss of appetite
🌿 Toxic Parts:
leaves flowers seeds
⚡ Toxic If:

if eaten

Keep plants away from pets. If ingestion is suspected, contact a veterinarian immediately.
Humans
Toxic

Allamanda cathartica contains several toxic compounds, including alkaloids and saponins, which can cause gastrointestinal distress and other systemic effects upon ingestion. The plant's milky sap may also cause skin irritation in sensitive individuals.

⚠️ Symptoms:
nausea vomiting diarrhea abdominal pain skin irritation
🌿 Toxic Parts:
leaves flowers seeds
⚡ Toxic If:

if eaten

Keep out of reach of children and avoid ingestion. Wear gloves when handling to prevent skin contact with the sap.
Important: Keep this plant out of reach of children and pets. If ingestion occurs, contact poison control or veterinary services immediately.

Frequently Asked Questions

Q: Is Allamanda cathartica toxic to pets?

A: Yes, it is mildly toxic to dogs and cats if ingested.

Q: How often should I water Allamanda cathartica?

A: Water moderately, allowing the soil to dry slightly between waterings.

Q: Does Allamanda cathartica require full sun?

A: Yes, it thrives in full sun to partial shade.

Quick Reference
Family: Apocynaceae
Care: moderate
Light: full sun to partial shade
Water: every 7–10 days during activ
Suitable For: ["collectors/enthusiasts","outdoor landscapers","fragrance lovers","wildlife supporters (attracts bees, butterflies, birds)"]
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