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Perennial of the Rubiaceae family, Asperula boissierii is endemic to southern Spain, mainly the Sierra Nevada and the limestone massifs of Andalusia, where it colonizes rock crevices and rocky screes exposed at altitude, between approximately 1,800 and 3,000 meters. It is among the most delicate and coveted asperulas by alpine plant enthusiasts.
It forms a creeping and spreading carpet of woody-based stems, very branched, bearing small linear and fleshy, bright green leaves, arranged in dense and regular whorls, which gives the plant an almost conifer-like texture, reminiscent of tiny juniper twigs. This characteristic habit is one of the most immediately striking features of the species.
The flowers, with four lobes widely spread in a star shape, are pale pink to pinkish-white, with a slightly yellowish center, borne in small terminal groups directly above the foliage. In its natural habitat, its flowering extends from June to August depending on the altitude. In cultivation, it generally occurs in May-June.
It requires absolute drainage, a very mineral substrate, preferably limestone, and full light. Stagnant winter moisture is fatal to it. Pot cultivation in a mixture of pumice and crushed limestone, under cold and airy shelter in winter, is highly recommended in humid climates.