Southern Wood Sorrel (Oxalis dillenii)

Southern Wood Sorrel

Oxalis dillenii

Its clover-like leaves fold at dusk, a quiet daily rhythm. Herbaceous perennial; common name: Southern Wood Sorrel.

Partial sun
2–3/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; tolerate dappled sunlight to avoid leaf scorch in hot summer afternoons
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Watering Keep soil evenly moist but not waterlogged; allow top 1 cm of soil to dry between waterings to prevent root rot
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Temperature Thrives in 15–25°C; tolerates light frost but will go dormant in temperatures below 5°C
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Characteristics

  • Leaf: Trifoliate heart-shaped leaflets, green to bronze, fold inward at night
  • Flower: Pale pink to white five-petaled blooms, open only in full sun
  • Stem: Slender, branching, slightly hairy stems
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Care Guide

Watering

Keep soil consistently moist; water when top 1 cm of soil feels dry

Fertilization

Apply diluted balanced liquid fertilizer every 4 weeks. Use a low-nitrogen fertilizer to prioritize flower production over leaf growth

Banana peel compost tea:Compost banana peels for 2 weeks, steep in water for 24 hours, dilute 1:20 with water before applying as a root drench; avoid using raw peels to prevent pest infestations
Pruning
  • Deadhead spent blooms regularly to encourage continuous flowering throughout the growing season
  • Trim back yellowing or damaged foliage to maintain a tidy clumping habit
  • Cut stems back to ground level in late autumn to prepare the plant for winter dormancy
  • Remove any overcrowded clumps in early spring to improve airflow and reduce disease risk
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; oxalate crystals cause oral pain, hypersalivation, vomiting, and difficulty swallowing

Humans: Contains calcium oxalate crystals; ingestion of large quantities causes mild oral irritation; sensitive individuals may experience skin rash on contact

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental ground cover for rock gardens; leaves have a tart, citrus-like flavor and can be eaten in small quantities