Hypericum empetrifolium ssp. oliganthum is a sub-shrub of the Hypericaceae family, native to Greece and the Aegean islands, where it grows on dry rocky areas, open garrigues, and very sunny limestone or siliceous slopes, at low and medium altitude.
It forms a dense and spreading bush, significantly more compact than the type species which can reach 50 to 60 cm, generally remaining between 15 and 25 cm in height, with a dome-shaped and slightly prostrate habit. The fine, woody stems are very branched from the base, giving it a tight and regular texture. Its foliage is one of its most distinctive features: the leaves are tiny, linear to needle-like, dark green and shiny, arranged in whorls along the stems, which gives it its epithet empetrifolium, in reference to their resemblance to Empetrum leaves. This evergreen foliage gives the plant an almost ericoid and very elegant appearance.
The flowers, bright and vivid yellow, are borne in small, sparse groups, as the qualifier oliganthum suggests, with few flowers. Nevertheless, they are produced in such abundance across the entire bush that they literally cover it, creating an effect of remarkable color intensity. In its natural habitat, its flowering extends from May to July; in cultivation, it generally occurs from May to June.
It requires absolute full sun and perfectly drained, poor soil, dry in summer. Its hardiness is moderate, around -8 to -10°C in dry conditions. It performs ideally in rock gardens on rocks, walls, and gravel gardens in Mediterranean or mild climates.