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Helichrysum retortum is a perennial from the Asteraceae family, native to the Cape region in South Africa, where it grows on the rocky slopes and sandstone outcrops of the Fynbos, at low and medium altitudes. This southern Mediterranean biome experiences hot, dry summers and mild, rainy winters, giving this species a climatic profile very different from that of alpine helichrysums.
It forms a small, spreading to semi-creeping bush, 15 to 30 cm in height, with thin stems branching from the base. The foliage consists of small, narrow leaves, curled along their length, a characteristic directly reflected in the name retortum, twisted or contorted. This detail is immediately visible to the naked eye and is sufficient to identify the species. The entire plant is covered with a dense white-silvery tomentum that gives it a remarkable shine, especially under low-angle light.
The flower heads are solitary, borne at the end of the stems, with numerous pure white scarious bracts spread out in rays around a bright yellow center, giving them an appearance closer to a large daisy rather than the usual small clustered heads of the genus. In its natural habitat, flowering extends from September to November, corresponding to the southern spring. In cultivation under our latitudes, it generally blooms in spring and early summer.
The species is frost-sensitive and only tolerates very light and brief frosts, around -3 to -5°C at most, with the absolute condition that the soil is dry and the air well-circulated. A cold and wet winter is fatal to it. Outside Mediterranean areas and the mildest Atlantic coasts, pot cultivation in a cold, frost-free, well-ventilated, and very bright shelter is the only reliable solution. The substrate must be very mineral and draining, low in organic matter. Watering is reduced in winter and gradually resumes in spring with vegetation.