Purple Shamrock (Oxalis triangularis)

Purple Shamrock

Oxalis triangularis

Purple heart-shaped leaves fold at dusk like sleeping butterflies. Ornamental foliage plant; common name: Purple Shamrock.

Partial sun
1–2/week
Beginner
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Plant Needs

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Sunlight Bright indirect light; tolerate partial shade, avoid harsh midday direct sun which can scorch purple foliage
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Watering Water when the top 2 cm of soil feels dry; avoid overwatering to prevent root rot
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Temperature Thrives at 15–22°C; protect from frost and extreme heat above 28°C which can cause leaf browning
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Characteristics

  • Leaf: Triangular, deep purple, trifoliate; folds at night and in low light conditions
  • Flower: Pale pink to white, five-petaled, cup-shaped blooms on slender stalks
  • Stem: Slender, green to reddish, upright or slightly trailing
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Care Guide

Watering

Keep soil evenly moist but not waterlogged

Fertilization

Diluted balanced feed every 2 weeks. Avoid over-fertilizing, as this can cause leggy growth and faded leaf color

Banana peel tea:Soak chopped banana peels in water for 24 hours, dilute 1:10 with water, and use as a root drench to support foliage health
Pruning
  • Remove spent flower stalks and yellowing leaves to encourage new growth
  • Trim leggy stems in early spring to maintain a compact, bushy shape
  • Divide overcrowded clumps every 2–3 years during repotting to refresh the plant
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA-confirmed toxic; ingestion may cause vomiting, diarrhea, drooling, and lethargy

Humans: Contains calcium oxalate crystals; causes mild oral irritation if leaves are chewed

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Garden Uses & Culture

Culture: Symbolizes good fortune and rebirth in some cultural traditions

Usage: Indoor ornamental foliage, container gardening, shaded border plant