A rare, bone hardy campanula relative, with showy spikes of blue, bulging, pixie-hat bells about an inch long, rising above clumps of toothed leaves which also clad the stems. Its home is eastern Asia, and in particular north and central Japan.
For best results, sow immediately onto a good soil-based compost. Cover the seeds with fine grit or compost to approximately their own depth. They can be sown at any time, and germination can sometimes be quicker if kept at 15 to 20 degrees C. We sow most seeds in an unheated greenhouse and wait for natural germination, as many seeds have built-in dormancy mechanisms, often waiting for natural spring germination, hence giving them a full season of growth.