Preuss's Strophanthus (Strophanthus preussii)

Preuss's Strophanthus

Strophanthus preussii

Its slender twisted blooms hide potent cardiac toxins, a delicate yet hazardous beauty. Evergreen woody climbing shrub; common name: Preuss's strophanthus.

Partial sun
1–2/week
Moderate
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Plant Needs

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Sunlight Bright indirect light; tolerates partial shade, avoid intense midday direct sun to prevent leaf scorch
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Watering Water thoroughly when the top 2–3 cm of soil dries out; avoid waterlogging to prevent root rot
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Temperature Thrives in warm tropical temperatures; avoid temperatures below 15°C as it may cause leaf drop and stunted growth
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Characteristics

  • Leaf: Opposite, elliptical to oblong, glossy dark green with smooth entire margins
  • Flower: Tubular white to pale pink blooms with elongated, spirally twisted petal lobes
  • Stem: Woody twining stems with aerial roots for climbing anchorage
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Care Guide

Watering

Keep soil consistently moist but not waterlogged; mist foliage weekly to boost humidity

Fertilization

Diluted balanced liquid fertilizer every 2 weeks. Discontinue fertilization during autumn and winter when growth slows

Banana peel compost tea:Compost banana peels for 4–6 weeks, dilute 1:20 with water for root drench; avoid using raw peels to prevent pest infestations and odor
Pruning
  • Trim overgrown stems in early spring to maintain desired climbing shape
  • Remove dead, yellowing, or damaged foliage to improve airflow and reduce disease risk
  • Cut back spent flower stalks to redirect energy toward new growth
  • Train climbing stems to a trellis or support structure to prevent tangling
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: Related Strophanthus species are classified as toxic by ASPCA; ingestion may trigger vomiting, irregular heartbeat, and weakness

Humans: Contains cardiac glycosides in seeds and sap; ingestion can disrupt heart rhythm and cause severe systemic effects

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Garden Uses & Culture

Culture: N/A

Usage: Historically used in traditional medicine (with extreme caution) for cardiac conditions; cultivated as an ornamental climbing plant