12 seeds per packet.
A clump-forming, robust, hardy perennial species that is native to Korea and Japan, producing violet-blue flowers and toothed, hairy leaves, which turn an attractive red in autumn. Flowering from spring to summer. Height 60 cm. Moist, well-drained soil in sun to part shade.
Can be sown from autumn to June. Cover seed thinly, press in gently and keep top of compost from drying out. Keep pot cool over winter. Keep warm at 15 to 20°C in spring 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.