Slender Broomrape (Orobanche gracilis)

Slender Broomrape

Orobanche gracilis

A delicate parasitic wildflower, clinging to host roots for sustenance. Parasitic herbaceous perennial; common name: Slender Broomrape.

Low light
0/week
Challenging
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Plant Needs

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Sunlight Does not require sunlight, as it obtains all nutrients from host plant roots and lacks photosynthetic tissue
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Watering Does not require independent watering; relies entirely on the host plant for moisture uptake
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Temperature Thrives in cool to temperate temperatures; cannot tolerate extreme frost or prolonged heat above 28°C
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Characteristics

  • Leaf: Reduced to scale-like, non-photosynthetic structures along the stem
  • Flower: Tubular, pale purple to pinkish-white blooms arranged in a dense terminal spike
  • Stem: Smooth, unbranched, pale brown to purplish-green
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Care Guide

Watering

No independent watering needed; host plant provides all necessary moisture

Fertilization

No fertilization needed; obtains all nutrients from host plant. Fertilizer application will not benefit the plant, as it does not produce its own food via photosynthesis

N/A:Not applicable; the plant relies entirely on host plant nutrients for survival
Pruning
  • Remove spent flower spikes after blooming to prevent excessive self-seeding and reduce competition for host resources
  • Avoid disturbing the host plant's root system, as this can disrupt the parasitic attachment
  • No regular pruning is required beyond deadheading spent blooms
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: No known toxicity to cats (ASPCA unlisted, no reported adverse effects)

Humans: No known toxicity to humans

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Garden Uses & Culture

Culture: N/A

Usage: N/A