Barbara Karst Bougainvillea (Bougainvillea x buttiana 'Barbara Karst')

Barbara Karst Bougainvillea

Bougainvillea x buttiana 'Barbara Karst'

Vibrant magenta bracts blaze like summer fire, a sun-loving trailing climber. Flowering ornamental; common name: Barbara Karst bougainvillea.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Requires full sun (6+ hours of direct daily sunlight) for abundant bract production; tolerates partial shade with reduced flowering
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Watering Water deeply when the top 5–7 cm of soil is completely dry; avoid overwatering to prevent root rot
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Temperature Thrives in 18–30°C; protect from frost below 10°C to prevent leaf drop and stem damage
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Characteristics

  • Leaf: Oval, glossy green, 4–10 cm long, arranged alternately on woody stems
  • Flower: Tiny white true flowers surrounded by showy, vibrant magenta bracts (primary ornamental feature)
  • Stem: Thorny, woody trailing/climbing branches with twining growth habit
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Care Guide

Watering

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

Fertilization

Feed every 2–3 weeks with balanced, diluted liquid fertilizer. Discontinue fertilization in autumn to prepare the plant for dormancy

Banana peel compost tea:Compost banana peels for 2–3 weeks, steep in water for 24 hours, dilute 1:20 for root drench; avoid using raw peels to prevent pest infestations
Pruning
  • Prune immediately after flowering to shape growth and encourage new bract-producing branches
  • Remove dead, diseased, or crossing branches to improve airflow and reduce pest risk
  • Trim back overly long trailing stems to maintain desired size and habit
  • Wear thick gloves to avoid injury from thorny stems during pruning
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA confirmed non-toxic to cats; no adverse effects from ingestion or contact

Humans: No documented toxicity to humans; non-irritating to skin or mouth

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Garden Uses & Culture

Culture: Symbolizes passion, vibrancy, and tropical warmth in ornamental gardening

Usage: Ornamental climbing vine for trellises, walls, arbors, and container gardening; can be pruned into a compact shrub