Sprays of white flowers, held on short stems on this loose tufted plant, age to a rosy-purple colour in June and July. It is incredibly hardy down to -28C, and is native to the Eastern Alps and also the Arctic.
Seeds can be sown at any time but are best sown in winter or early spring to benefit from a cold spell in the wet compost to break their dormancy. We advise covering seeds very thinly with sand or fine grit to about the depth of the seed size. If the seeds do not come up within 6 to 12 weeks the damp seed tray can be given cold treatment in a fridge for about four weeks. They may still take very many months to appear, so please never discard the pot or tray.