Plant Profile: Oxalis triangularis

The Purple Shamrock Plant is a decorative herbaceous perennial belonging to the wood sorrel family, originating from South America. Its trifoliate leaves, which can range from green to variegated or deep maroon, resemble those of a shamrock. Notably, the leaves fold up at night or when disturbed. During the spring and summer, the plant produces clusters of white to pink flowers with five petals, which bloom on stems that rise above the foliage and also close at night.

In most regions of North Carolina, this plant is best suited for indoor cultivation. It thrives in a loamy potting mix that offers excellent drainage, and it’s important to let the top layer of soil dry out between waterings. Ideally, it should be placed in an area with full sun to partial shade. The plant may enter a dormant phase in the fall or if exposed to excessive heat or dryness. During this time, reduce watering and patiently await the emergence of new growth.