Crown of Thorns

Native to the dry, rocky landscapes of Madagascar, Crown of Thorns (Euphorbia milii) was introduced to Europe in 1821 by Baron Milius, the French governor of Réunion, from whom the plant takes its species name. Its common name comes from a long-standing Christian tradition that its woody, thorn-covered stems were woven into the crown placed on Christ during the crucifixion. While there is no historical evidence to support this legend, it has become deeply associated with the plant and contributed to its enduring popularity. In Thailand, where it is known as poi sian (“plant of the eight immortals”), Crown of Thorns is regarded as a symbol of prosperity, protection and good fortune. Traditional belief holds that a plant producing eight or more flowers at once brings luck and success to the household, making it a popular gift for new homes and businesses. Despite its formidable spines, Crown of Thorns is an exceptionally tough and rewarding succulent. It flowers almost continuously in warm, bright conditions, producing colourful red, pink, yellow, white or cream bracts that surround the tiny true flowers at their centres. Modern hybrids are especially floriferous and can bloom throughout the year. This drought-tolerant plant thrives in full sun and requires a fast-draining cactus or succulent mix. Allow the soil to dry completely between waterings, as excessive moisture can quickly lead to root rot. A terracotta pot helps keep the roots healthy by allowing excess water to evaporate. During winter, reduce watering while the plant’s growth slows. When pruning or repotting, wear gloves. Like all euphorbias, Crown of Thorns produces a milky white latex sap that can irritate the skin and eyes and is toxic if ingested by people or pets. With plenty of sunlight and minimal care, however, it can live for decades, gradually developing thick, sculptural stems covered with distinctive spines and crowned with masses of colourful blooms.