Oxalis triangularis

Oxalis triangularis

False Shamrock

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Taxonomy

Common Names

False ShamrockPurple Shamrock

Context

nativeRegion

South America, especially Brazil.

usdaZones

7–11 (grown as a houseplant in cooler zones).

companionPlants

Begonia, African violet, Saintpaulia, Pilea

culturalUses

Often kept as an ornamental plant for its striking foliage; sometimes associated with good luck.

Care

LightBright, indirect sunlight is ideal. Can tolerate some direct morning sun, but intense afternoon sun should be avoided.

WateringWater when the top inch of soil feels dry. Avoid waterlogging, but do not let the soil dry out completely for prolonged periods.

SoilWell-draining, moderately fertile potting mix with some peat and perlite or sand added.

FertilizerFeed every 2-3 weeks during the growing season with a balanced, diluted liquid fertilizer.

HumidityPrefers moderate humidity but is generally tolerant of average indoor air.

TemperaturePrefers temperatures between 15°C–25°C (59°F–77°F). Sensitive to frost, should be kept above 10°C (50°F).

HabitHerbaceous, clump-forming perennial with trifoliate, deep purple leaves and delicate pink to white flowers.

Mature Size15–30 cm (6–12 in) tall and wide.

Growth RateModerate to fast growing under optimal conditions.

BloomingSpring through summer, sometimes intermittently year-round indoors.

DormancyEnters dormancy in winter or under stress; leaves will die back and regrow from tubers.

MethodsDivision of rhizomes or tubers, Seed (less common in cultivation)

DifficultyEasy

Best SeasonSpring or after the dormancy period

PruningRemove spent leaves and faded flowers to encourage new growth and maintain appearance.

RepottingRepot every 1–2 years or when tubers become crowded.

Pests & DiseasesOccasionally affected by aphids, spider mites, or fungal root rot if overwatered.

ToxicityMildly toxic if ingested by pets or humans due to oxalate compounds.

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