Helichrysum

Helichrysum, also known as immortelle or everlasting flower, is a compact silver-leaved sub-shrub forming dense mounds 30-50cm tall. Note that this aromatic/essential oil variety is the same species (H. italicum) as the curry plant but is grown specifically for its flowers and essential oil rather than culinary use. Plant in full sun with lean, very well-drained soil.

This Mediterranean native thrives on neglect in hot, dry conditions. Avoid rich soil, frequent watering, or heavy feeding—all of which produce weak growth and dilute the essential oils that make helichrysum so valuable. Sandy, gravelly, or chalky soils are ideal. In cooler climates, plant against a south-facing wall for maximum warmth and reflected heat.

Prune lightly after flowering, cutting back to just below the spent flower heads but never into bare old wood. This maintains the compact, silvery mound shape. In colder areas (zone 7), protect the crown with a deep gravel mulch in winter. Container culture is ideal where winter drainage cannot be guaranteed—use a terracotta pot with a very gritty compost mix.

Helichrysum (Helichrysum angustifolium, also classified as Helichrysum italicum) is native to the rocky, sun-drenched hillsides and coastal scrublands of the Mediterranean basin, with its primary range extending across southern France, Corsica, Sardinia, the Dalmatian coast, Greece, and North Africa. It is a defining species of the Mediterranean maquis and garrigue plant communities, thriving in thin, calcareous or sandy soils at elevations from sea level to about 800 metres, where summer drought and intense sunshine would challenge less adapted species. The plant has been intertwined with Mediterranean culture for millennia. Ancient Greeks and Romans valued helichrysum for both its ornamental beauty and its medicinal properties. Greek physicians including Dioscorides and Galen described its use in treating wounds, respiratory complaints, and digestive disorders. The flowers were woven into garlands for religious ceremonies because they never wilted, earning the plant associations with immortality and the divine. During the medieval period, helichrysum continued to be cultivated in monastery physic gardens across southern Europe, where monks documented its effectiveness as an anti-inflammatory and skin-healing agent. Folk medicine traditions on the islands of Corsica and Sardinia developed particularly detailed knowledge of the plant, using infusions of the flowers and leaves to treat bruises, burns, allergies, and liver complaints. The essential oil industry brought renewed attention to helichrysum in the 20th century, as steam distillation revealed the extraordinary concentration of bioactive compounds in the flowers, including italidiones, neryl acetate, and curcumene. Today, Helichrysum italicum essential oil is among the most prized and expensive botanical extracts in aromatherapy and natural skincare, driving significant commercial cultivation in the Balkans, Corsica, and parts of southern France. As a garden plant, helichrysum has gained popularity worldwide for its drought tolerance, silver foliage, and everlasting golden flowers.

Helichrysum demands the sharpest possible drainage with a pH of 6.5-8.5. Poor, gravelly, sandy, or chalky soils are ideal. Never enrich the soil—lean conditions produce the highest concentrations of essential oils. Mix at least 50% grit into planting holes in average garden soil. No fertilizer is needed or wanted. Container plants can receive a very dilute liquid feed once in spring.

Harvest helichrysum flower buds just as they begin to open but before they are fully expanded—this is when essential oil content peaks. Cut flower stems with secateurs, leaving enough foliage below for the plant to regenerate. For dried flowers, harvest when buds are half-open; they will continue to open as they dry. The silver foliage can be harvested sparingly throughout the season for sachets and potpourri.

Hang flower stems upside down in a warm, dark, well-ventilated area to dry. The papery, straw-like flowers are true everlastings—they retain their form and golden color indefinitely when properly dried. Store dried flowers loosely in paper bags or display in arrangements. For essential oil, steam distillation of fresh flowers yields the prized helichrysum oil used in skin care and aromatherapy. Dried foliage retains its silver color and subtle fragrance for potpourri.