Quinine Tree (Cinchona pubescens)

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Sunlight Bright indirect to partial sun; tolerates dappled shade in tropical highland habitats

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Watering Keep soil consistently moist but well-drained; avoid waterlogging that can cause root rot

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Temperature Thrives in cool tropical highland temperatures; avoid frost and extreme heat above 28°C

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Leaf: Opposite, elliptical to oblong, glossy dark green with pubescent undersides
Flower: Clusters of fragrant pink to white tubular blooms
Bark: Thick, brown, with fissured texture when mature

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Watering

Maintain consistent soil moisture; apply mulch to retain soil humidity

Fertilization

Diluted balanced fertilizer every 4 weeks. Discontinue fertilization in autumn and winter to support dormancy

Composted banana peel tea：Steep fully composted banana peels in water for 3 days; dilute 1:20 for root drench to support foliage and bark development

Pruning

Remove dead or diseased branches in early spring to improve airflow
Thin overcrowded inner growth to enhance light penetration
Trim to maintain desired height in cultivated settings; avoid heavy pruning of mature trees

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Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; contains quinine compounds that may cause vomiting, diarrhea, tremors, and cardiac irregularities

Humans: Contains quinine and quinidine; excessive ingestion causes cinchonism (tinnitus, nausea, dizziness)

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Culture: Symbol of medicinal innovation; used in traditional Andean medicine to treat fever and malaria

Usage: Medicinal bark source for quinine production; ornamental shade tree in suitable high-altitude climates