Horticultural hybrid of the Linaceae family, Linum 'Gemmell's Hybrid' is a cultivar obtained by crossing, generally attributed to a cross between Linum campanulatum and Linum elegans. It does not exist in the wild and is entirely cultivated, but it inherits the temperament of the Mediterranean and Balkan species from which it originates, with a marked preference for dry and sunny conditions.
It forms a low and compact mound, with slightly upright branched stems, barely exceeding 15 cm in height. The foliage is narrow, lanceolate, a fairly dense grayish green, partially evergreen depending on the climate.
The flowers are large for such a contained plant, a deep and bright butter yellow with five well-spread petals, borne in light cymes that follow one another over a long period. In cultivation, flowering mainly extends in June, sometimes beyond if conditions are favorable. The disproportion between the floral generosity and the very restrained habit is one of the immediate attractions of this cultivar.
It requires perfect drainage, a mineral or slightly sandy substrate, low in organic matter, and full sun exposure. It does not tolerate stagnant winter moisture. Its place is well found in an alpine trough, elevated rock garden, or collection container.