A white-flowered P. subulata but very special. The flower petals are deeply cut and notched and really do look like big snowflakes - except they all look alike! And like snowflakes, they appear in drifts which smother the light green foliage.
'Snowflake' is a very compact, slow grower for its type - small enough for the edge of a trough or container if you wish. About 7cm (3") high.