Thread-leaved Sundew (Drosera filiformis)

Thread-leaved Sundew

Drosera filiformis

Its thread-like leaves glisten with sticky dew, trapping tiny insects like a delicate hunter. Carnivorous perennial herb; common name: thread-leaved sundew.

Full sun
2–3/week
Moderate
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Plant Needs

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Sunlight Requires full sun to partial sun; bright light is necessary to produce the sticky mucilage for insect trapping and photosynthesis
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Watering Keep soil consistently moist with distilled, rain, or reverse-osmosis water; avoid tap water which contains minerals that can harm the sensitive roots
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Temperature Thrives in cool to temperate conditions; can tolerate brief light frosts but should be protected from prolonged freezing temperatures
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Characteristics

  • Leaf: Slender, thread-like leaves up to 30 cm long, covered in sticky glandular hairs that secrete dew-like mucilage to trap insects
  • Flower: Small, five-petaled pink blooms on thin, wiry stalks rising above the rosette
  • Stem: Thin, delicate flowering stalks emerge from the center of the basal rosette
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Care Guide

Watering

Keep soil constantly saturated using a tray to maintain consistent moisture levels

Fertilization

No fertilization required; obtains nutrients from captured insects. Do not apply commercial fertilizers as they can burn the plant's sensitive roots

Dechlorinated aquarium water:Dilute 1:1 with distilled water before applying to avoid nutrient overload; do not use water with high nitrate levels
Pruning
  • Remove dead, brown leaves and spent flower stalks to maintain plant appearance and airflow
  • Trim overcrowded rosettes in early spring to encourage new, healthy growth
  • Avoid touching the delicate glandular leaves to prevent damage to the sticky mucilage-producing hairs
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

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

Humans: No known toxic compounds; ingestion of large quantities may cause mild gastrointestinal discomfort from indigestible plant material

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Garden Uses & Culture

Culture: N/A

Usage: Carnivorous ornamental plant; used in bog garden displays and indoor terrariums