Ambiguous Mercury (Mercurialis ambigua)

Ambiguous Mercury

Mercurialis ambigua

Hardy perennial herb with inconspicuous flowers; member of the Euphorbiaceae family and closely related to other mercury plants.

Partial sun
2/week
Beginner
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Plant Needs

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Sunlight Prefers full sun to partial shade with several hours of direct light
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Watering Moderate watering, keeping the soil slightly moist but not waterlogged
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Temperature Thrives in mild climates, tolerates cool conditions down to light frost
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Characteristics

  • Leaves: Opposite, lanceolate to narrowly elliptic leaves, 3–10 cm long, margins entire or slightly toothed, glabrous to sparsely hairy;
  • Flowers: Small, greenish, unisexual flowers borne in leaf axils, male flowers in clusters, female flowers solitary or few;
  • Stems: Slender, erect, often branched, green to reddish;
  • Fruit: Small capsule with two or more seeds, surface smooth.
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Care Guide

Watering

Water regularly to keep soil lightly moist

Fertilization

Apply balanced organic fertilizer at start of growth. Use slow-release organic fertilizer or compost to support growth

Coffee grounds:Dry coffee grounds before incorporating into soil; avoid excessive use to prevent acidification
Pruning
  • Remove dead or yellowing leaves to encourage fresh growth;
  • Cut back stems after flowering to maintain shape;
  • Thin crowded plants to improve airflow;
  • Remove seed capsules to control self-seeding.
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: Toxic per ASPCA data for related Mercurialis species; may cause oral irritation and vomiting

Humans: Contains pyridin alkaloids that may cause mild gastrointestinal upset when ingested

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Garden Uses & Culture

Culture: N/A

Usage: - Traditionally used in some regions for medicinal purposes, though caution advised due to toxicity; - Groundcover in wild or semi-natural plantings.