Blue Angel's Trumpet (Iochroma australe)

Blue Angel's Trumpet

Iochroma australe

Vibrant tubular blooms glow like indigo lanterns against lush foliage. Evergreen flowering shrub; common name: Blue Angel's Trumpet.

Partial sun
2–3/week
Moderate
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Plant Needs

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Sunlight Full sun to partial shade; prefers bright indirect light in hot climates to prevent leaf scorch
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Watering Water thoroughly when the top 2–3 cm of soil is dry; avoid waterlogging to prevent root rot
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Temperature Thrives in 15–25°C; protect from frost below 5°C, as cold exposure causes leaf drop and stem damage
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Characteristics

  • Leaf: Oval to lanceolate, glossy dark green, 10–15 cm long, with slightly serrated margins
  • Flower: Pendulous tubular blooms, 5–7 cm long, in clusters of 3–6, ranging from deep blue to violet
  • Stem: Woody, branching, with soft pubescence on new growth
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Care Guide

Watering

Keep soil consistently moist but not soggy to support active growth and blooming

Fertilization

Diluted balanced 10-10-10 fertilizer every 2 weeks. Avoid over-fertilizing, as excessive nitrogen can reduce bloom production

Banana peel compost tea:Soak fully composted banana peels in water for 24 hours, dilute 1:20 for root drench; discard solids to prevent pest infestations and odor
Pruning
  • Prune immediately after flowering to shape the shrub and encourage dense new growth
  • Remove dead or damaged branches to improve airflow and reduce disease risk
  • Thin overcrowded stems to promote better light penetration and bloom development
  • Trim back leggy growth in early spring to maintain a compact, rounded form
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; contains tropane alkaloids that cause gastrointestinal and neurological symptoms

Humans: Ingestion causes mild to moderate gastrointestinal distress; large quantities may induce dizziness or hallucinations due to tropane alkaloids

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental garden shrub, patio container plant, cut flower arrangements; attracts hummingbirds and native pollinators