Helianthemum is a genus that includes 25-30 species of perennial grasses, or small shrubs, originating in the area surrounding the Mediterranean and North America. Eliantemo plants have erect, arched or prostrate stems, which tend to lignify over the years; the leaves are lanceolate, 2-3 cm long, dark green, sometimes greyish-green or silvery-green, slightly pubescent; the stems remain close to 20-25 cm in height. From May until late summer it produces a profusion of small flat flowers, yellow, pink, orange or red, with a golden yellow heart, similar to very small simple roses, in fact they are also called with the name of the rose of the rocks. To maintain a compact appearance it is good to remove weak or damaged branches from winter, in February-March, and then shorten the stems by about a third of their length after flowering. There are numerous cultivars with flowers of various colors, of all shades of yellow and pink.
It is best to place the plants of Helianthemum in a very sunny place where they can receive direct sunlight for many hours a day; in fact these plants can easily withstand even the direct sun in the hottest months of the year.
The helianthemum they do not fear the cold and can also bear being placed in the shade even if they produce less intense blooms if they are arranged in shady places.
In general, the specimens of rose from the rocks are satisfied with the rains, withstanding even long periods of drought without problems; to have a more abundant flowering and a luxuriant growth of the plant of rock rose it is good to water occasionally during the hottest and driest months of the year, always having the foresight to check that the soil has the correct drainage and does not allow the formation of water stagnation.
In spring it is good to bury at the foot of the bush a good quantity of mature organic fertilizer so that the plants of rock rose have all the necessary nutrients for good flowering.
The rose plants of the rocks love dry and very well drained soils; in placing a home helianthemum It is good to use balanced soil, mixed with sand and pumice stone with a fairly fine grain so as to have a substrate of the right consistency and that allows the drainage of water in a correct manner.
generally occurs by seed, in January-February in a protected place; in February, or after flowering, it is possible to divide the clumps, taking care to leave some vigorous and well developed roots for each portion practiced.
Eliantemo, Rosellina of the rocks - Helianthemum: Pests and diseases
These small shrubs appear to be very vigorous and rustic and, for this reason, in general, they are not attacked by pests or diseases making it unnecessary to intervene with preventive treatments based on specific products that are often recommended for other kinds of plants before the vegetative restart.
Excessive humidity and the presence of root rot can, however, damage the plant, causing the onset of root rot which, if not opposed, can even lead to the death of affected specimens.