Linum catharticum, commonly known as Purging Flax or Fairy Flax, is an annual herbaceous plant native to a variety of habitats including grasslands, heaths, and open woodlands across Great Britain, Iceland, Europe, and Western Asia. It typically grows to a height of 5-30 cm and features slender stems with narrow leaves. The small, white flowers bloom in July and August and are quite showy despite their size, with each flower consisting of five petals that attract a range of pollinators. Purging Flax is particularly notable for its historical use in traditional medicine as a mild laxative.

In cultivation, Purging Flax is valued for its delicate appearance and medicinal properties. It is often used in wildflower meadows, informal garden settings, and as a component in herbal medicine gardens. This plant prefers full sun to partial shade and thrives in well-drained, sandy or loamy soils. It is generally low-maintenance but requires consistent moisture during the growing season. While it is not commonly afflicted by diseases, it is known to host the pathogenic fungus flax rust (Melampsora lini), which can cause damage to the leaves. Gardeners should be aware of this potential issue and monitor for signs of infection.CC BY-SA 4.0