Balloon Vine (Cardiospermum halicacabum)

Balloon Vine

Cardiospermum halicacabum

Its inflated seed pods look like tiny green balloons, playful and delicate. Annual climbing vine; common names: Balloon Vine, Heartseed.

Full sun
2–3/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; tolerate mild afternoon shade in hot, arid climates to prevent leaf scorch
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Watering Water deeply when the top 2 cm of soil feels dry; avoid overwatering to prevent root rot
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Temperature Thrives in warm, tropical to subtropical temperatures; cannot survive frost or prolonged exposure below 10°C
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Characteristics

  • Leaf: Pinnately compound, leaflets ovate with serrated margins; bright medium green.
  • Flower: Small, fragrant white blooms arranged in axillary racemes.
  • Fruit: Inflated papery green pods that turn brown at maturity; contain black seeds with distinct white heart-shaped markings.
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Care Guide

Watering

Keep soil consistently moist but not waterlogged; increase watering frequency during periods of high heat or drought

Fertilization

Diluted balanced liquid fertilizer every 2 weeks. Avoid over-fertilizing, as this can lead to excessive foliage growth at the expense of flowering and fruiting

Banana peel compost tea:Soak fully composted banana peels in water for 24 hours; dilute the tea 1:20 with water before applying as a root drench to support flower and pod development
Pruning
  • Trim overgrown vines to maintain desired shape and improve air circulation around foliage
  • Deadhead spent flower clusters to encourage continuous blooming throughout the growing season
  • Cut back stems to 30 cm above soil level in late autumn for container-grown plants to prepare for dormancy
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats

Humans: No known toxic effects on humans

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental climbing vine for trellises and arbors; traditional medicinal uses in some South Asian and African regions