40 seeds per packet.
A rare species in cultivation and an endangered one in the wild, where it is only to be found in a small area of the Aso district in Kyushu, Japan. You will find this a much more delicate Polemonium species than is usually encountered, one which possesses the most amazing, beautiful, blue flowers from late spring and early summer. Height to 40 cm. Well-drained soil in sun to semi-shade.
Sow from March to June. Cover seed thinly, press in gently and keep top of compost from drying out. Keep pot warm at 15 to 20°C until germination, then move to somewhere cooler.
Carefully prick out seedlings when they have developed true leaves and are large enough to transplant to individual pots to grow on.