Campanula pyramidalis ‘alba’ – This is a biennial with tall (1.5m), erect, pyramidal flower covered spikes. In mid or late summer in its 2nd year, it produces fragrant, saucer-shaped, white flowers on these spikes. Insect pollination leads to production of seeds. Sun or part shade and moist well-drained soil.
Sow Campanula pyramidalis ‘alba’ indoors. Sow onto the surface of moist well-drained seed compost, press in lightly. Do not cover with soil, light is needed for germination. Propagate 16-18°C. Germination takes 14-28 days. Once germinated admit air to prevent damping off. When large enough to handle transplant seedlings to 8cm pots and grow on in cooler conditions. Plant out once danger of frost has passed with 50cm spacing.