Halimium lasianthum subsp. formosum

Halimium lasianthum subsp. formosum is an evergreen undershrub of Mediterranean origin well adapted to poor and dry soils, just like the cistus and helianthems to which it is closely related. Forming a rounded and spreading bush, it bears pretty small dark grey-green leaves and offers spring to summer flowering that is absolutely radiant, resembling bright yellow dog roses speckled with reddish-brown at the centre. Halimiums are all excellent shrubs for rockeries and dry slopes and charming subjects for decorating sunny terraces, including those by the sea. They can be grown in any well-drained soil without excess lime, in full sun, with almost no water or fertilizer.

Halimium formosum is also called Cistus lasianthus subsp. formosum according to certain nomenclatures. It is an undershrub of the Cistaceae family, which is found in the wild in open pine forests and scrub vegetation in southern Spain and Portugal, as well as in northern Morocco. This species can withstand occasional frosts of -12 °C (10.4 °F) in perfectly drained soil. The plant reaches an average height of 60 cm (23.6 in) with a spread of 1 m (3 ft 4 in), displaying a compact slightly prostrate habit that is kept dense through regular light pruning.

The flowering occurs before the height of summer, from April to June-July depending on the climate and soil. At the tips of the branches, floral buds appear in clusters that open into beautiful single flowers measuring 4-5 cm (1.6-2 in) in diameter, with 5 petals of a very bright yellow speckled with very dark red at the base. The heart of the flower is occupied by a bunch of yellow-orange stamens. Each flower disappears in the late afternoon, releasing a shower of petals on the ground. The numerous buds ensure a long flowering period. The leaves are evergreen, ranging from 0.5 to 4 cm (0.2 to 1.6 in) in length, with 3 veins. Downy when they emerge, they turn a fairly dark grey-green when mature, with a silvery downy underside. The root system of this "cistus" is both deep and branching, so powerful that it manages to penetrate between fractured rocks or in dry sand to draw the slightest trace of moisture from deep down, while its surface roots capture moisture from the soil. Its lifespan in the garden varies between 12 and 15 years. This plant is sensitive to root asphyxiation in overly compact and moist soil in winter.

Halimium lasianthum subsp. formosum is an excellent rockery and poor soil plant, perfectly adapted to summer drought. It can create a beautiful scene when combined with Mediterranean bindweeds like Convolvulus sabatius, althaeoides, and cneorum. Create a border, reminiscent of the scrub vegetation, by mixing the foliage and scents of lavenders (blue, white, pink), rosemary (creeping or erect), thymes (T.vulgaris, T. polytrichus), sages (Salvia x jamensis or officinalis), oreganos, teucriums (T.chamaedrys, T. x lucidrys, T. hircanicum), catmints, ballotes, and dryland spurges (E.characias, E. cyparissias). Cultivation in large pots is possible, by ensuring good drainage and providing ample but infrequent watering, allowing the substrate to dry out between waterings.