Chamber Bitter (Phyllanthus urinaria)

Chamber Bitter

Phyllanthus urinaria

Tiny, delicate foliage carries medicinal heritage. Annual herbaceous plant; common names: chamber bitter, stonebreaker.

Partial sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; tolerates short periods of direct midday sun in cool climates
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Watering Water thoroughly when the top 1–2 cm of soil dries out; avoid standing water to prevent root rot
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Temperature Thrives in warm, humid conditions; protect from frost and temperatures below 10°C
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Characteristics

  • Leaf: Small oblong leaves arranged in two flattened rows along stems, mimicking pinnate foliage
  • Flower: Inconspicuous greenish-yellow axillary flowers, rarely noticeable
  • Stem: Slender, branched green to reddish-brown stems with smooth texture
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Care Guide

Watering

Keep soil consistently moist but not waterlogged

Fertilization

Diluted balanced liquid feed every 2 weeks. Avoid over-fertilization to prevent excessive foliage growth at the expense of flowering

Eggshell powder topdress:Crush dried eggshells into fine powder; sprinkle lightly on soil surface to boost calcium levels and improve soil drainage
Pruning
  • Pinch back growing tips to encourage bushier, compact growth
  • Remove yellowing or damaged foliage to improve airflow and plant appearance
  • Trim overgrown stems in mid-summer to control spread and maintain desired shape
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA does not list this plant as toxic to cats

Humans: No reported toxic effects in humans; used in traditional herbal medicine

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Garden Uses & Culture

Culture: N/A

Usage: Traditional herbal medicinal uses; low-growing ornamental ground cover