Commelina cyanea, commonly known as scurvy weed, is a perennial herb native to moist, shaded forest floors and the understory of open eucalyptus woodlands in eastern Australia. It typically forms a low-growing mat with fleshy stems that can reach lengths of up to 40 cm. The plant is characterized by its bright blue, three-petaled flowers which bloom from spring to autumn and are moderately showy. The foliage is a lush green with a succulent appearance, and the plant spreads easily through both seeds and stem fragments.

Scurvy weed is valued for its hardiness and ability to thrive in shaded conditions, making it suitable for ground cover in garden beds and borders that receive little sunlight. It is also used for its historical medicinal properties, believed to treat scurvy due to its high vitamin C content. In cultivation, it requires moist, well-drained soil and can tolerate a range of light conditions from part shade to full shade. While it is relatively low-maintenance, it can become invasive outside its native habitat, spreading rapidly and outcompeting other plants. Gardeners should be cautious and ensure it does not escape into natural areas.CC BY-SA 4.0