Euphorbia horrida - African milk barrel

Euphorbia horrida, commonly known as the Bristly Euphorbia or "African Milk Barrel", is a succulent plant native to South Africa. Valued for its robust appearance and prominent thorns, it features cylindrical blue-green stems with wavy ribs adorned with long thorns. This euphorbia will delight succulent enthusiasts looking for an original and easy-to-grow variety in a south-facing, sun-drenched room.

Belonging to the Euphorbiaceae family, Euphorbia horrida or Euphorbia polygona originates from the arid regions of the Great Karoo in South Africa, particularly the Wittepoort Mountains in the Willowmore district. In its natural habitat, it forms a dense bush composed of irregular stems that can reach 1 to 1.5 metres in height, resembling a cactus. Its erect, blue-green stems grow to about 75 cm tall and 10 to 15 cm wide, with 10 to 20 flattened and often wavy ribs. The thorns, derived from dried floral peduncles, are orange or grey and can grow up to 4 cm long. They are arranged in clusters along the ribs and are sharp, much like true cacti. The flowers, called cyathia, are small and yellowish-green, appearing individually along the stem's ribs. They are tiny and have limited ornamental value. In cultivation, particularly indoors, Euphorbia horrida remains more compact, typically reaching 30 to 60 cm in height and forming denser clumps. Its growth is relatively slow, and its size depends on growing conditions and available space.

To grow Euphorbia horrida indoors, place it in a spot with direct sunlight. Use a well-draining substrate, such as a cactus and succulent mix, to prevent waterlogging. Water moderately during the growing season, allowing the substrate to dry completely between waterings, and reduce watering in winter. This species prefers temperatures between 18°C and 24°C, always above 10°C, and it cannot tolerate frost. Handle with gloves, as its white sap is toxic and may cause skin irritation.

Euphorbia horrida pairs well with other columnar Euphorbias, such as Euphorbia ingens or Euphorbia canariensis, for a sculptural effect. It can also be highlighted alongside globular cacti like Echinocactus grusonii. The contrast between its ribbed stems and the rounded forms of cacti will be striking. Surround it with decorative rocks and light-coloured gravel to mimic its natural habitat.