In the world of indoor gardening, Oxalis Triangularis, often referred to as the False Shamrock or Purple Shamrock, has won over plant lovers across Europe. With its striking appearance, unique foliage, ability to tolerate lower light conditions, and relatively easy maintenance, it’s a favourite for brightening homes and gardens.
Origin and Characteristics
Oxalis Triangularis originates from the lush rainforests of Brazil, located in South America. Much like the Peace Lily, this plant naturally thrives on the forest floor, benefiting from the shade of larger plants that filter the sunlight. Because of its preference for indirect sunlight, it’s well-suited for indoor cultivation in the typically overcast climates of Europe, where direct sunlight may be less abundant.
A fascinating aspect of Oxalis Triangularis is its phototropic behaviour. This means the plant moves in response to light, opening and closing its leaves depending on the light it receives. Its stunning purple or maroon leaf colour comes from anthocyanin pigments, which are more prominent in bright light. In lower light, the leaves take on a greener tone, a natural process that helps the plant manage its energy more efficiently.
Growing Oxalis Triangularis
Light:
Oxalis Triangularis adapts well to lower light levels, making it a great option for those with limited access to bright sunlight. For the best results, place your plant in a bright room but avoid direct sunlight, which can damage its delicate leaves.
Watering:
During the growing season, which spans spring and summer, maintain evenly moist soil by watering when the top 2-3 cm of soil feels dry. Be sure to water thoroughly and allow excess water to drain out, preventing root rot. As the plant enters dormancy in the colder months (autumn and winter), reduce watering to match its lower energy needs.
Soil and Potting:
A well-draining potting mix is key for healthy growth. A mix containing peat moss and perlite works well. Since Oxalis Triangularis has a shallow root system, opt for a shallow pot, but ensure it provides enough space for the plant’s roots to grow as it matures.
Temperature and Humidity:
The plant thrives in average indoor temperatures, between 15-24°C, with humidity levels around 40-60%. If the air in your home tends to be dry, you may need to mist the plant or use a humidity tray or humidifier to maintain the right environment, particularly in the drier winter months.
Fertilisation:
To keep your plant healthy and vibrant, apply a balanced liquid fertiliser every 4-6 weeks during the active growing season. This helps promote lush growth and the development of the plant's beautiful anthocyanin pigments. Fertilisation should be reduced during the plant's dormancy period in autumn and winter.
Common Problems and Solutions
Drooping Leaves:
If you notice drooping leaves, it’s likely a sign of under-watering or inconsistent watering. Adjust your watering schedule to ensure the plant stays hydrated, especially during the warmer months of growth.
Yellowing Leaves:
Yellow leaves can indicate overwatering or poor drainage. Make sure your pot has drainage holes and adjust your watering routine accordingly. Check the moisture level of the soil by inserting your finger a few centimetres into the soil. If it feels wet, hold off on watering until it dries out.
Pests:
Occasionally, pests like aphids, mealybugs, or spider mites may appear. Treat infestations with neem oil or an organic insecticide, and keep the affected plant separate from others to prevent spreading. Remove damaged plant parts if necessary.
Dormancy:
Oxalis Triangularis naturally enters dormancy in winter, during which time it may appear to wilt or die back. Prune away dead or dying foliage and reduce watering during this time. This rest period helps the plant regenerate and encourages new growth in spring.
Leggy Growth and Lack of Flowers:
If your plant becomes leggy, it may not be receiving enough light. Move it to a brighter location and trim back any leggy growth to encourage fuller, healthier foliage. In addition, increasing the light exposure and fertilisation can promote flowering in mature plants.