Purple Toothwort (Lathraea clandestina)

Purple Toothwort

Lathraea clandestina

A hidden parasitic beauty, blooming underground before emerging. Parasitic perennial herb; common name: Purple Toothwort.

Low light
1–2/week
Moderate
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Plant Needs

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Sunlight Non-photosynthetic parasitic herb; requires no direct sunlight, grows in shaded, damp woodland habitats
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Watering Keep soil consistently damp, as the plant obtains moisture and nutrients from host tree roots
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Temperature Thrives in cool temperate conditions; avoid extreme heat above 22°C or prolonged frost below 0°C
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Characteristics

  • Leaf: Reduced to small, scale-like non-photosynthetic structures along pale stems
  • Flower: Dense terminal spikes of purple-pink tubular flowers emerging above soil
  • Stem: Succulent pale brown stems attached to host roots via haustoria
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Care Guide

Watering

Maintain consistent soil moisture to support host root health

Fertilization

No fertilization required. Obtains all nutrients from host plant roots; external fertilization is unnecessary

N/A:No fertilization needed, as the plant relies entirely on host nutrient uptake
Pruning
  • Remove spent flower spikes after blooming to control self-seeding if desired
  • Avoid disturbing host plant roots when maintaining the planting area
  • Clear fallen debris around the plant to maintain consistent soil moisture levels
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: No documented toxicity to cats

Humans: No known toxicity to humans

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental woodland ground cover; ecological study of parasitic plant interactions