White Swallow-wort (Vincetoxicum hirundinaria)

White Swallow-wort

Vincetoxicum hirundinaria

Its delicate white blooms hide potent cardiac glycosides. Perennial herbaceous vine; common name: white swallow-wort.

Partial sun
1–2/week
Moderate
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Plant Needs

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Sunlight Partial to full sun; tolerates light shade, but produces more blooms in well-lit open areas
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Watering Water deeply when the top 5 cm of soil is dry; avoid overwatering to prevent root rot
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Temperature Hardy to -10°C, suitable for cool to warm temperate climates; protect from prolonged extreme heat above 30°C
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Characteristics

  • Leaf: Opposite, ovate to lanceolate leaves with smooth margins, matte green upper surface and paler underside.
  • Flower: Clusters of small, star-shaped white blooms with five petals, producing a subtle sweet fragrance in warm temperatures.
  • Stem: Slender, green to reddish-brown trailing or climbing stems that exude milky white sap when broken.
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Care Guide

Watering

Keep soil consistently moist but not waterlogged; increase watering frequency during hot, dry spells

Fertilization

Apply diluted balanced liquid fertilizer once monthly. Avoid over-fertilizing, as it can reduce flower production

Composted banana peel tea:Soak fully composted banana peels in water for 3 days, dilute the mixture 1:20 with tap water, and apply directly to soil; avoid using raw peels to prevent pest infestations and odor
Pruning
  • Cut back dead or damaged stems to ground level in early spring to stimulate new growth
  • Remove mature seed pods before they burst to prevent unwanted self-seeding, especially in regions where it is considered invasive
  • Thin overcrowded stems mid-season to improve airflow and reduce the risk of fungal infections
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic due to cardiac glycosides; ingestion can cause vomiting, diarrhea, irregular heartbeat, weakness, and potential fatal cardiac arrest

Humans: Contains cardiac glycosides; ingestion may cause nausea, vomiting, abdominal pain, and cardiac arrhythmias in large doses

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Garden Uses & Culture

Culture: N/A

Usage: N/A