Dwarf shrub of the Ericaceae family, Cassiope lycopodioides is native to the mountains of East Asia — Japan, Korea, and the Kuril Islands — where it colonizes alpine and subalpine heaths, moist rocks, and wind-exposed slopes, at altitudes of approximately 1,500 to 2,500 meters. The cultivar 'Beatrice Lilley' is a particularly floriferous horticultural selection, obtained and distributed in specialized alpine cultivation circles.
The plant forms dense, creeping cushions, hardly exceeding 5 to 10 cm in height, with finely interwoven stems of small, dark green scaly leaves, tightly packed together like a clubmoss — hence the specific epithet. This evergreen foliage, with its remarkably regular texture, is a visual attraction in its own right.
The flowers, suspended individually on fine reddish peduncles, are small pure white bells with slightly pinkish lobes, enhanced by a calyx with reddish-brown sepals that give them a discreet and characteristic elegance. Their flowering in cultivation extends from April to May, literally covering the cushion.
It requires an acidic, peaty soil, constantly fresh without excess stagnant moisture, in a semi-shaded exposure; it does not tolerate dry heat or limestone.