Toothwort (Lathraea squamaria)

Toothwort

Lathraea squamaria

A curious parasitic herb that hides in soil, revealing only pale blooms in spring. Parasitic perennial; common name: Toothwort.

Low light
0/week
Moderate
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Plant Needs

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Sunlight No direct sunlight required; grows entirely underground except for flowering spikes in spring
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Watering No supplemental watering needed; obtains all moisture from host tree root systems
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Temperature Tolerates cool temperate climates; survives mild frosts during winter dormancy
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Characteristics

  • Leaf: Reduced to colorless, scale-like bracts wrapping stems; no photosynthetic foliage
  • Flower: Pale pink to purple tubular blooms in dense terminal spikes; bilateral symmetry
  • Stem: Thick, fleshy underground rhizomes that attach to host tree roots for nutrient uptake
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Care Guide

Watering

No supplemental watering; relies on host tree for moisture

Fertilization

No fertilization needed; obtains all nutrients from host tree. Do not apply fertilizers directly to the plant, as it does not use soil nutrients

N/A:No DIY fertilizers required; all nutrients are obtained from host tree root systems
Pruning
  • Remove spent flower spikes after blooming to prevent unwanted self-seeding
  • Avoid digging near the plant to prevent damage to underground rhizomes
  • Clear surrounding invasive weeds to reduce competition for host tree resources
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: No documented toxicity to cats

Humans: No documented toxicity to humans

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental woodland ground cover; limited historical medicinal use for mild pain relief