The Oxalis triangularis ‘Oxapapense’, often called the Purple Shamrock or False Shamrock, is a popular houseplant. It features striking deep purple, triangular leaves and delicate white or pink flowers. A distinctive characteristic is its leaves’ ability to fold up at night or when stressed, a movement known as nyctinasty.
Caring for Oxapapense
Light
Oxapapense thrives in bright, indirect light. Place it near an east-facing window for suitable illumination. While it tolerates gentle morning or late afternoon sun, prolonged direct sunlight can scorch its delicate leaves. Insufficient light leads to leggy growth, with elongated, sparse stems, and leaves may lose their vibrant purple coloration. Rotate the plant regularly for even growth.
Watering
Water thoroughly when the top inch (2.5 cm) of soil feels dry. Ensure excess water drains completely to prevent root rot. While the plant appreciates consistent moisture, overwatering is a common issue. Conversely, prolonged underwatering causes browning leaf tips and wilting.
Soil and Potting
Oxapapense prefers a well-draining, slightly acidic soil mix (pH 6.0-6.5). A suitable mix includes equal parts peat moss, perlite, and potting soil, allowing for good drainage while retaining moisture. Pots must have drainage holes to prevent roots from sitting in standing water. Repot every one to two years, or when root-bound, to provide fresh nutrients and more space.
Temperature and Humidity
Oxapapense thrives in average room temperatures, ideally between 18°C and 24°C (65°F and 75°F). Temperatures consistently above 27°C (80°F) can cause heat stress, wilting, or dormancy. Shield the plant from cold drafts or extreme temperature fluctuations. Average household humidity is usually sufficient, but higher humidity is beneficial, especially in dry environments. Misting the leaves or placing the pot on a pebble tray can help increase humidity.
Fertilizing
During its active growing season (spring and summer), Oxapapense benefits from regular feeding. Apply a balanced, water-soluble liquid fertilizer monthly. Dilute fertilizer according to product instructions to prevent over-fertilization, which can burn the plant’s roots. Reduce or stop fertilizing as the plant approaches dormancy in fall and winter.
Oxapapense Dormancy
Oxapapense naturally enters a dormant phase, typically in late fall or winter, or during periods of stress. During this time, the plant’s leaves may die back, which is a normal part of its life cycle, allowing the plant to rest and conserve energy.
To care for a dormant Oxapapense, gradually reduce watering and stop fertilizing completely. Store the plant in its pot in a cool, dark, and dry location. After a period of rest, typically a few weeks to a couple of months, encourage new growth by gradually reintroducing bright, indirect light and resuming a regular watering schedule.
Propagating Oxapapense
Propagating Oxapapense is most effective through the division of its rhizomes. These small, pinecone-like bulbs store energy and are the plant’s primary means of reproduction. When repotting or during dormancy (late winter/early spring), carefully separate these rhizomes.
Plant each healthy rhizome with at least one or two leaf buds in fresh, well-draining potting soil, just below the surface. Ensure proper drainage in the new pot. After planting, water lightly and provide indirect sunlight; new growth should emerge within a few weeks, indicating successful propagation.
Troubleshooting Common Issues
Several common issues can affect Oxapapense. Leggy growth or loss of vibrant leaf color often indicates insufficient light; move the plant to a brighter, indirect light location. Yellowing leaves frequently suggest overwatering or nutrient deficiency. Allowing the soil to dry out between waterings and ensuring proper drainage can help.
Wilting, despite recent watering, might signal root rot from overwatering or severe underwatering. Check soil moisture deeply and inspect roots for softness to diagnose the problem. Crispy leaf edges typically signal low humidity or underwatering. A lack of new growth often means the plant is entering its natural dormant phase or requires more nutrients during its active growing season.
Oxapapense and Pet Safety
Oxalis triangularis ‘Oxapapense’ contains soluble calcium oxalates, which can be toxic if ingested. These compounds can cause adverse reactions in pets, including cats and dogs, and humans. Symptoms of ingestion may include drooling, vomiting, diarrhea, lethargy, and weakness. In severe cases, particularly with large quantities, more serious effects like tremors or kidney damage can occur. Keep Oxapapense plants out of reach of pets and small children to prevent accidental ingestion.